Roll Observatory packages and add a roll script

analyzer/lib/src/generated/parser.dart

-// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-// This code was auto-generated, is not intended to be edited, and is subject to
-// significant change. Please see the README file for more information.
-
-library engine.parser;
-
-import 'dart:collection';
-import "dart:math" as math;
-
-import 'ast.dart';
-import 'engine.dart' show AnalysisEngine, AnalysisOptionsImpl;
-import 'error.dart';
-import 'java_core.dart';
-import 'java_engine.dart';
-import 'scanner.dart';
-import 'source.dart';
-import 'utilities_collection.dart' show TokenMap;
-import 'utilities_dart.dart';
-
-Map<String, MethodTrampoline> methodTable_Parser = <String, MethodTrampoline>{
-  'parseCompilationUnit_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target.parseCompilationUnit(arg0)),
-  'parseDirectives_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target.parseDirectives(arg0)),
-  'parseExpression_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target.parseExpression(arg0)),
-  'parseStatement_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target.parseStatement(arg0)),
-  'parseStatements_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target.parseStatements(arg0)),
-  'parseAnnotation_0':
-      new MethodTrampoline(0, (Parser target) => target.parseAnnotation()),
-  'parseArgument_0':
-      new MethodTrampoline(0, (Parser target) => target.parseArgument()),
-  'parseArgumentList_0':
-      new MethodTrampoline(0, (Parser target) => target.parseArgumentList()),
-  'parseBitwiseOrExpression_0': new MethodTrampoline(
-      0, (Parser target) => target.parseBitwiseOrExpression()),
-  'parseBlock_0':
-      new MethodTrampoline(0, (Parser target) => target.parseBlock()),
-  'parseClassMember_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target.parseClassMember(arg0)),
-  'parseCompilationUnit_0': new MethodTrampoline(
-      0, (Parser target) => target.parseCompilationUnit2()),
-  'parseConditionalExpression_0': new MethodTrampoline(
-      0, (Parser target) => target.parseConditionalExpression()),
-  'parseConstructorName_0':
-      new MethodTrampoline(0, (Parser target) => target.parseConstructorName()),
-  'parseExpression_0':
-      new MethodTrampoline(0, (Parser target) => target.parseExpression2()),
-  'parseExpressionWithoutCascade_0': new MethodTrampoline(
-      0, (Parser target) => target.parseExpressionWithoutCascade()),
-  'parseExtendsClause_0':
-      new MethodTrampoline(0, (Parser target) => target.parseExtendsClause()),
-  'parseFormalParameterList_0': new MethodTrampoline(
-      0, (Parser target) => target.parseFormalParameterList()),
-  'parseFunctionExpression_0': new MethodTrampoline(
-      0, (Parser target) => target.parseFunctionExpression()),
-  'parseImplementsClause_0': new MethodTrampoline(
-      0, (Parser target) => target.parseImplementsClause()),
-  'parseLabel_0':
-      new MethodTrampoline(0, (Parser target) => target.parseLabel()),
-  'parseLibraryIdentifier_0': new MethodTrampoline(
-      0, (Parser target) => target.parseLibraryIdentifier()),
-  'parseLogicalOrExpression_0': new MethodTrampoline(
-      0, (Parser target) => target.parseLogicalOrExpression()),
-  'parseMapLiteralEntry_0':
-      new MethodTrampoline(0, (Parser target) => target.parseMapLiteralEntry()),
-  'parseNormalFormalParameter_0': new MethodTrampoline(
-      0, (Parser target) => target.parseNormalFormalParameter()),
-  'parsePrefixedIdentifier_0': new MethodTrampoline(
-      0, (Parser target) => target.parsePrefixedIdentifier()),
-  'parseReturnType_0':
-      new MethodTrampoline(0, (Parser target) => target.parseReturnType()),
-  'parseSimpleIdentifier_0': new MethodTrampoline(
-      0, (Parser target) => target.parseSimpleIdentifier()),
-  'parseStatement_0':
-      new MethodTrampoline(0, (Parser target) => target.parseStatement2()),
-  'parseStringLiteral_0':
-      new MethodTrampoline(0, (Parser target) => target.parseStringLiteral()),
-  'parseTypeArgumentList_0': new MethodTrampoline(
-      0, (Parser target) => target.parseTypeArgumentList()),
-  'parseTypeName_0':
-      new MethodTrampoline(0, (Parser target) => target.parseTypeName()),
-  'parseTypeParameter_0':
-      new MethodTrampoline(0, (Parser target) => target.parseTypeParameter()),
-  'parseTypeParameterList_0': new MethodTrampoline(
-      0, (Parser target) => target.parseTypeParameterList()),
-  'parseWithClause_0':
-      new MethodTrampoline(0, (Parser target) => target.parseWithClause()),
-  'advance_0': new MethodTrampoline(0, (Parser target) => target._advance()),
-  'appendScalarValue_5': new MethodTrampoline(5, (Parser target, arg0, arg1,
-      arg2, arg3,
-      arg4) => target._appendScalarValue(arg0, arg1, arg2, arg3, arg4)),
-  'computeStringValue_3': new MethodTrampoline(3, (Parser target, arg0, arg1,
-      arg2) => target._computeStringValue(arg0, arg1, arg2)),
-  'convertToFunctionDeclaration_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target._convertToFunctionDeclaration(arg0)),
-  'couldBeStartOfCompilationUnitMember_0': new MethodTrampoline(
-      0, (Parser target) => target._couldBeStartOfCompilationUnitMember()),
-  'createSyntheticIdentifier_0': new MethodTrampoline(
-      0, (Parser target) => target._createSyntheticIdentifier()),
-  'createSyntheticKeyword_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target._createSyntheticKeyword(arg0)),
-  'createSyntheticStringLiteral_0': new MethodTrampoline(
-      0, (Parser target) => target._createSyntheticStringLiteral()),
-  'createSyntheticToken_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target._createSyntheticToken(arg0)),
-  'ensureAssignable_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target._ensureAssignable(arg0)),
-  'expect_1':
-      new MethodTrampoline(1, (Parser target, arg0) => target._expect(arg0)),
-  'expectGt_0': new MethodTrampoline(0, (Parser target) => target._expectGt()),
-  'expectKeyword_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target._expectKeyword(arg0)),
-  'expectSemicolon_0':
-      new MethodTrampoline(0, (Parser target) => target._expectSemicolon()),
-  'findRange_2': new MethodTrampoline(
-      2, (Parser target, arg0, arg1) => target._findRange(arg0, arg1)),
-  'getCodeBlockRanges_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target._getCodeBlockRanges(arg0)),
-  'getEndToken_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target._getEndToken(arg0)),
-  'injectToken_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target._injectToken(arg0)),
-  'isFunctionDeclaration_0': new MethodTrampoline(
-      0, (Parser target) => target._isFunctionDeclaration()),
-  'isFunctionExpression_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target._isFunctionExpression(arg0)),
-  'isHexDigit_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target._isHexDigit(arg0)),
-  'isInitializedVariableDeclaration_0': new MethodTrampoline(
-      0, (Parser target) => target._isInitializedVariableDeclaration()),
-  'isLinkText_2': new MethodTrampoline(
-      2, (Parser target, arg0, arg1) => target._isLinkText(arg0, arg1)),
-  'isOperator_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target._isOperator(arg0)),
-  'isSwitchMember_0':
-      new MethodTrampoline(0, (Parser target) => target._isSwitchMember()),
-  'isTypedIdentifier_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target._isTypedIdentifier(arg0)),
-  'lockErrorListener_0':
-      new MethodTrampoline(0, (Parser target) => target._lockErrorListener()),
-  'matches_1':
-      new MethodTrampoline(1, (Parser target, arg0) => target._matches(arg0)),
-  'matchesGt_0':
-      new MethodTrampoline(0, (Parser target) => target._matchesGt()),
-  'matchesIdentifier_0':
-      new MethodTrampoline(0, (Parser target) => target._matchesIdentifier()),
-  'matchesKeyword_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target._matchesKeyword(arg0)),
-  'matchesString_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target._matchesString(arg0)),
-  'optional_1':
-      new MethodTrampoline(1, (Parser target, arg0) => target._optional(arg0)),
-  'parseAdditiveExpression_0': new MethodTrampoline(
-      0, (Parser target) => target._parseAdditiveExpression()),
-  'parseAssertStatement_0': new MethodTrampoline(
-      0, (Parser target) => target._parseAssertStatement()),
-  'parseAssignableExpression_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target._parseAssignableExpression(arg0)),
-  'parseAssignableSelector_2': new MethodTrampoline(2, (Parser target, arg0,
-      arg1) => target._parseAssignableSelector(arg0, arg1)),
-  'parseAwaitExpression_0': new MethodTrampoline(
-      0, (Parser target) => target._parseAwaitExpression()),
-  'parseBitwiseAndExpression_0': new MethodTrampoline(
-      0, (Parser target) => target._parseBitwiseAndExpression()),
-  'parseBitwiseXorExpression_0': new MethodTrampoline(
-      0, (Parser target) => target._parseBitwiseXorExpression()),
-  'parseBreakStatement_0':
-      new MethodTrampoline(0, (Parser target) => target._parseBreakStatement()),
-  'parseCascadeSection_0':
-      new MethodTrampoline(0, (Parser target) => target._parseCascadeSection()),
-  'parseClassDeclaration_2': new MethodTrampoline(2,
-      (Parser target, arg0, arg1) => target._parseClassDeclaration(arg0, arg1)),
-  'parseClassMembers_2': new MethodTrampoline(
-      2, (Parser target, arg0, arg1) => target._parseClassMembers(arg0, arg1)),
-  'parseClassTypeAlias_3': new MethodTrampoline(3, (Parser target, arg0, arg1,
-      arg2) => target._parseClassTypeAlias(arg0, arg1, arg2)),
-  'parseCombinator_0':
-      new MethodTrampoline(0, (Parser target) => target.parseCombinator()),
-  'parseCombinators_0':
-      new MethodTrampoline(0, (Parser target) => target._parseCombinators()),
-  'parseCommentAndMetadata_0': new MethodTrampoline(
-      0, (Parser target) => target._parseCommentAndMetadata()),
-  'parseCommentReference_2': new MethodTrampoline(2,
-      (Parser target, arg0, arg1) => target._parseCommentReference(arg0, arg1)),
-  'parseCommentReferences_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target._parseCommentReferences(arg0)),
-  'parseCompilationUnitMember_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target._parseCompilationUnitMember(arg0)),
-  'parseConstExpression_0': new MethodTrampoline(
-      0, (Parser target) => target._parseConstExpression()),
-  'parseConstructor_8': new MethodTrampoline(8, (Parser target, arg0, arg1,
-          arg2, arg3, arg4, arg5, arg6, arg7) =>
-      target._parseConstructor(arg0, arg1, arg2, arg3, arg4, arg5, arg6, arg7)),
-  'parseConstructorFieldInitializer_0': new MethodTrampoline(
-      0, (Parser target) => target._parseConstructorFieldInitializer()),
-  'parseContinueStatement_0': new MethodTrampoline(
-      0, (Parser target) => target._parseContinueStatement()),
-  'parseDirective_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target._parseDirective(arg0)),
-  'parseDirectives_0':
-      new MethodTrampoline(0, (Parser target) => target._parseDirectives()),
-  'parseDocumentationComment_0': new MethodTrampoline(
-      0, (Parser target) => target._parseDocumentationComment()),
-  'parseDoStatement_0':
-      new MethodTrampoline(0, (Parser target) => target._parseDoStatement()),
-  'parseEmptyStatement_0':
-      new MethodTrampoline(0, (Parser target) => target._parseEmptyStatement()),
-  'parseEnumConstantDeclaration_0': new MethodTrampoline(
-      0, (Parser target) => target._parseEnumConstantDeclaration()),
-  'parseEnumDeclaration_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target._parseEnumDeclaration(arg0)),
-  'parseEqualityExpression_0': new MethodTrampoline(
-      0, (Parser target) => target._parseEqualityExpression()),
-  'parseExportDirective_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target._parseExportDirective(arg0)),
-  'parseExpressionList_0':
-      new MethodTrampoline(0, (Parser target) => target._parseExpressionList()),
-  'parseFinalConstVarOrType_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target._parseFinalConstVarOrType(arg0)),
-  'parseFormalParameter_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target._parseFormalParameter(arg0)),
-  'parseForStatement_0':
-      new MethodTrampoline(0, (Parser target) => target._parseForStatement()),
-  'parseFunctionBody_3': new MethodTrampoline(3, (Parser target, arg0, arg1,
-      arg2) => target._parseFunctionBody(arg0, arg1, arg2)),
-  'parseFunctionDeclaration_3': new MethodTrampoline(3, (Parser target, arg0,
-      arg1, arg2) => target._parseFunctionDeclaration(arg0, arg1, arg2)),
-  'parseFunctionDeclarationStatement_0': new MethodTrampoline(
-      0, (Parser target) => target._parseFunctionDeclarationStatement()),
-  'parseFunctionDeclarationStatementAfterReturnType_2': new MethodTrampoline(2,
-      (Parser target, arg0, arg1) =>
-          target._parseFunctionDeclarationStatementAfterReturnType(arg0, arg1)),
-  'parseFunctionTypeAlias_2': new MethodTrampoline(2, (Parser target, arg0,
-      arg1) => target._parseFunctionTypeAlias(arg0, arg1)),
-  'parseGetter_4': new MethodTrampoline(4, (Parser target, arg0, arg1, arg2,
-      arg3) => target._parseGetter(arg0, arg1, arg2, arg3)),
-  'parseIdentifierList_0':
-      new MethodTrampoline(0, (Parser target) => target._parseIdentifierList()),
-  'parseIfStatement_0':
-      new MethodTrampoline(0, (Parser target) => target._parseIfStatement()),
-  'parseImportDirective_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target._parseImportDirective(arg0)),
-  'parseInitializedIdentifierList_4': new MethodTrampoline(4,
-      (Parser target, arg0, arg1, arg2, arg3) =>
-          target._parseInitializedIdentifierList(arg0, arg1, arg2, arg3)),
-  'parseInstanceCreationExpression_1': new MethodTrampoline(1,
-      (Parser target, arg0) => target._parseInstanceCreationExpression(arg0)),
-  'parseLibraryDirective_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target._parseLibraryDirective(arg0)),
-  'parseLibraryName_2': new MethodTrampoline(
-      2, (Parser target, arg0, arg1) => target._parseLibraryName(arg0, arg1)),
-  'parseListLiteral_2': new MethodTrampoline(
-      2, (Parser target, arg0, arg1) => target._parseListLiteral(arg0, arg1)),
-  'parseListOrMapLiteral_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target._parseListOrMapLiteral(arg0)),
-  'parseLogicalAndExpression_0': new MethodTrampoline(
-      0, (Parser target) => target._parseLogicalAndExpression()),
-  'parseMapLiteral_2': new MethodTrampoline(
-      2, (Parser target, arg0, arg1) => target._parseMapLiteral(arg0, arg1)),
-  'parseMethodDeclarationAfterParameters_7': new MethodTrampoline(7,
-      (Parser target, arg0, arg1, arg2, arg3, arg4, arg5, arg6) => target
-          ._parseMethodDeclarationAfterParameters(
-              arg0, arg1, arg2, arg3, arg4, arg5, arg6)),
-  'parseMethodDeclarationAfterReturnType_4': new MethodTrampoline(4,
-      (Parser target, arg0, arg1, arg2, arg3) => target
-          ._parseMethodDeclarationAfterReturnType(arg0, arg1, arg2, arg3)),
-  'parseModifiers_0':
-      new MethodTrampoline(0, (Parser target) => target._parseModifiers()),
-  'parseMultiplicativeExpression_0': new MethodTrampoline(
-      0, (Parser target) => target._parseMultiplicativeExpression()),
-  'parseNativeClause_0':
-      new MethodTrampoline(0, (Parser target) => target._parseNativeClause()),
-  'parseNewExpression_0':
-      new MethodTrampoline(0, (Parser target) => target._parseNewExpression()),
-  'parseNonLabeledStatement_0': new MethodTrampoline(
-      0, (Parser target) => target._parseNonLabeledStatement()),
-  'parseOperator_3': new MethodTrampoline(3, (Parser target, arg0, arg1,
-      arg2) => target._parseOperator(arg0, arg1, arg2)),
-  'parseOptionalReturnType_0': new MethodTrampoline(
-      0, (Parser target) => target._parseOptionalReturnType()),
-  'parsePartDirective_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target._parsePartDirective(arg0)),
-  'parsePostfixExpression_0': new MethodTrampoline(
-      0, (Parser target) => target._parsePostfixExpression()),
-  'parsePrimaryExpression_0': new MethodTrampoline(
-      0, (Parser target) => target._parsePrimaryExpression()),
-  'parseRedirectingConstructorInvocation_0': new MethodTrampoline(
-      0, (Parser target) => target._parseRedirectingConstructorInvocation()),
-  'parseRelationalExpression_0': new MethodTrampoline(
-      0, (Parser target) => target._parseRelationalExpression()),
-  'parseRethrowExpression_0': new MethodTrampoline(
-      0, (Parser target) => target._parseRethrowExpression()),
-  'parseReturnStatement_0': new MethodTrampoline(
-      0, (Parser target) => target._parseReturnStatement()),
-  'parseSetter_4': new MethodTrampoline(4, (Parser target, arg0, arg1, arg2,
-      arg3) => target._parseSetter(arg0, arg1, arg2, arg3)),
-  'parseShiftExpression_0': new MethodTrampoline(
-      0, (Parser target) => target._parseShiftExpression()),
-  'parseStatementList_0':
-      new MethodTrampoline(0, (Parser target) => target._parseStatementList()),
-  'parseStringInterpolation_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target._parseStringInterpolation(arg0)),
-  'parseSuperConstructorInvocation_0': new MethodTrampoline(
-      0, (Parser target) => target._parseSuperConstructorInvocation()),
-  'parseSwitchStatement_0': new MethodTrampoline(
-      0, (Parser target) => target._parseSwitchStatement()),
-  'parseSymbolLiteral_0':
-      new MethodTrampoline(0, (Parser target) => target._parseSymbolLiteral()),
-  'parseThrowExpression_0': new MethodTrampoline(
-      0, (Parser target) => target._parseThrowExpression()),
-  'parseThrowExpressionWithoutCascade_0': new MethodTrampoline(
-      0, (Parser target) => target._parseThrowExpressionWithoutCascade()),
-  'parseTryStatement_0':
-      new MethodTrampoline(0, (Parser target) => target._parseTryStatement()),
-  'parseTypeAlias_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target._parseTypeAlias(arg0)),
-  'parseUnaryExpression_0': new MethodTrampoline(
-      0, (Parser target) => target._parseUnaryExpression()),
-  'parseVariableDeclaration_0': new MethodTrampoline(
-      0, (Parser target) => target._parseVariableDeclaration()),
-  'parseVariableDeclarationListAfterMetadata_1': new MethodTrampoline(1,
-      (Parser target, arg0) =>
-          target._parseVariableDeclarationListAfterMetadata(arg0)),
-  'parseVariableDeclarationListAfterType_3': new MethodTrampoline(3,
-      (Parser target, arg0, arg1, arg2) =>
-          target._parseVariableDeclarationListAfterType(arg0, arg1, arg2)),
-  'parseVariableDeclarationStatementAfterMetadata_1': new MethodTrampoline(1,
-      (Parser target, arg0) =>
-          target._parseVariableDeclarationStatementAfterMetadata(arg0)),
-  'parseVariableDeclarationStatementAfterType_3': new MethodTrampoline(3,
-      (Parser target, arg0, arg1, arg2) =>
-          target._parseVariableDeclarationStatementAfterType(arg0, arg1, arg2)),
-  'parseWhileStatement_0':
-      new MethodTrampoline(0, (Parser target) => target._parseWhileStatement()),
-  'parseYieldStatement_0':
-      new MethodTrampoline(0, (Parser target) => target._parseYieldStatement()),
-  'peek_0': new MethodTrampoline(0, (Parser target) => target._peek()),
-  'peekAt_1':
-      new MethodTrampoline(1, (Parser target, arg0) => target._peekAt(arg0)),
-  'reportError_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target._reportError(arg0)),
-  'reportErrorForCurrentToken_2': new MethodTrampoline(2, (Parser target, arg0,
-      arg1) => target._reportErrorForCurrentToken(arg0, arg1)),
-  'reportErrorForNode_3': new MethodTrampoline(3, (Parser target, arg0, arg1,
-      arg2) => target._reportErrorForNode(arg0, arg1, arg2)),
-  'reportErrorForToken_3': new MethodTrampoline(3, (Parser target, arg0, arg1,
-      arg2) => target._reportErrorForToken(arg0, arg1, arg2)),
-  'skipBlock_0':
-      new MethodTrampoline(0, (Parser target) => target._skipBlock()),
-  'skipFinalConstVarOrType_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target._skipFinalConstVarOrType(arg0)),
-  'skipFormalParameterList_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target._skipFormalParameterList(arg0)),
-  'skipPastMatchingToken_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target._skipPastMatchingToken(arg0)),
-  'skipPrefixedIdentifier_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target._skipPrefixedIdentifier(arg0)),
-  'skipReturnType_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target._skipReturnType(arg0)),
-  'skipSimpleIdentifier_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target._skipSimpleIdentifier(arg0)),
-  'skipStringInterpolation_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target._skipStringInterpolation(arg0)),
-  'skipStringLiteral_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target._skipStringLiteral(arg0)),
-  'skipTypeArgumentList_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target._skipTypeArgumentList(arg0)),
-  'skipTypeName_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target._skipTypeName(arg0)),
-  'skipTypeParameterList_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target._skipTypeParameterList(arg0)),
-  'tokenMatches_2': new MethodTrampoline(
-      2, (Parser target, arg0, arg1) => target._tokenMatches(arg0, arg1)),
-  'tokenMatchesIdentifier_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target._tokenMatchesIdentifier(arg0)),
-  'tokenMatchesKeyword_2': new MethodTrampoline(2,
-      (Parser target, arg0, arg1) => target._tokenMatchesKeyword(arg0, arg1)),
-  'tokenMatchesString_2': new MethodTrampoline(
-      2, (Parser target, arg0, arg1) => target._tokenMatchesString(arg0, arg1)),
-  'translateCharacter_3': new MethodTrampoline(3, (Parser target, arg0, arg1,
-      arg2) => target._translateCharacter(arg0, arg1, arg2)),
-  'unlockErrorListener_0':
-      new MethodTrampoline(0, (Parser target) => target._unlockErrorListener()),
-  'validateFormalParameterList_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target._validateFormalParameterList(arg0)),
-  'validateModifiersForClass_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target._validateModifiersForClass(arg0)),
-  'validateModifiersForConstructor_1': new MethodTrampoline(1,
-      (Parser target, arg0) => target._validateModifiersForConstructor(arg0)),
-  'validateModifiersForEnum_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target._validateModifiersForEnum(arg0)),
-  'validateModifiersForField_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target._validateModifiersForField(arg0)),
-  'validateModifiersForFunctionDeclarationStatement_1': new MethodTrampoline(1,
-      (Parser target, arg0) =>
-          target._validateModifiersForFunctionDeclarationStatement(arg0)),
-  'validateModifiersForGetterOrSetterOrMethod_1': new MethodTrampoline(1,
-      (Parser target, arg0) =>
-          target._validateModifiersForGetterOrSetterOrMethod(arg0)),
-  'validateModifiersForOperator_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target._validateModifiersForOperator(arg0)),
-  'validateModifiersForTopLevelDeclaration_1': new MethodTrampoline(1,
-      (Parser target, arg0) =>
-          target._validateModifiersForTopLevelDeclaration(arg0)),
-  'validateModifiersForTopLevelFunction_1': new MethodTrampoline(1,
-      (Parser target, arg0) =>
-          target._validateModifiersForTopLevelFunction(arg0)),
-  'validateModifiersForTopLevelVariable_1': new MethodTrampoline(1,
-      (Parser target, arg0) =>
-          target._validateModifiersForTopLevelVariable(arg0)),
-  'validateModifiersForTypedef_1': new MethodTrampoline(
-      1, (Parser target, arg0) => target._validateModifiersForTypedef(arg0)),
-};
-
-Object invokeParserMethodImpl(
-    Parser parser, String methodName, List<Object> objects, Token tokenStream) {
-  parser.currentToken = tokenStream;
-  MethodTrampoline method =
-      methodTable_Parser['${methodName}_${objects.length}'];
-  if (method == null) {
-    throw new IllegalArgumentException('There is no method named $methodName');
-  }
-  return method.invoke(parser, objects);
-}
-
-/**
- * A simple data-holder for a method that needs to return multiple values.
- */
-class CommentAndMetadata {
-  /**
-   * The documentation comment that was parsed, or `null` if none was given.
-   */
-  final Comment comment;
-
-  /**
-   * The metadata that was parsed.
-   */
-  final List<Annotation> metadata;
-
-  /**
-   * Initialize a newly created holder with the given [comment] and [metadata].
-   */
-  CommentAndMetadata(this.comment, this.metadata);
-}
-
-/**
- * A simple data-holder for a method that needs to return multiple values.
- */
-class FinalConstVarOrType {
-  /**
-   * The 'final', 'const' or 'var' keyword, or `null` if none was given.
-   */
-  final Token keyword;
-
-  /**
-   * The type, of `null` if no type was specified.
-   */
-  final TypeName type;
-
-  /**
-   * Initialize a newly created holder with the given [keyword] and [type].
-   */
-  FinalConstVarOrType(this.keyword, this.type);
-}
-
-/**
- * A dispatcher that will invoke the right parse method when re-parsing a
- * specified child of the visited node. All of the methods in this class assume
- * that the parser is positioned to parse the replacement for the node. All of
- * the methods will throw an [IncrementalParseException] if the node could not
- * be parsed for some reason.
- */
-class IncrementalParseDispatcher implements AstVisitor<AstNode> {
-  /**
-   * The parser used to parse the replacement for the node.
-   */
-  final Parser _parser;
-
-  /**
-   * The node that is to be replaced.
-   */
-  final AstNode _oldNode;
-
-  /**
-   * Initialize a newly created dispatcher to parse a single node that will
-   * use the [_parser] to replace the [_oldNode].
-   */
-  IncrementalParseDispatcher(this._parser, this._oldNode);
-
-  @override
-  AstNode visitAdjacentStrings(AdjacentStrings node) {
-    if (node.strings.contains(_oldNode)) {
-      return _parser.parseStringLiteral();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitAnnotation(Annotation node) {
-    if (identical(_oldNode, node.name)) {
-      throw new InsufficientContextException();
-    } else if (identical(_oldNode, node.constructorName)) {
-      throw new InsufficientContextException();
-    } else if (identical(_oldNode, node.arguments)) {
-      return _parser.parseArgumentList();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitArgumentList(ArgumentList node) {
-    if (node.arguments.contains(_oldNode)) {
-      return _parser.parseArgument();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitAsExpression(AsExpression node) {
-    if (identical(_oldNode, node.expression)) {
-      return _parser.parseBitwiseOrExpression();
-    } else if (identical(_oldNode, node.type)) {
-      return _parser.parseTypeName();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitAssertStatement(AssertStatement node) {
-    if (identical(_oldNode, node.condition)) {
-      return _parser.parseExpression2();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitAssignmentExpression(AssignmentExpression node) {
-    if (identical(_oldNode, node.leftHandSide)) {
-      // TODO(brianwilkerson) If the assignment is part of a cascade section,
-      // then we don't have a single parse method that will work.
-      // Otherwise, we can parse a conditional expression, but need to ensure
-      // that the resulting expression is assignable.
-//      return parser.parseConditionalExpression();
-      throw new InsufficientContextException();
-    } else if (identical(_oldNode, node.rightHandSide)) {
-      if (_isCascadeAllowedInAssignment(node)) {
-        return _parser.parseExpression2();
-      }
-      return _parser.parseExpressionWithoutCascade();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitAwaitExpression(AwaitExpression node) {
-    if (identical(_oldNode, node.expression)) {
-      // TODO(brianwilkerson) Depending on precedence,
-      // this might not be sufficient.
-      return _parser.parseExpression2();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitBinaryExpression(BinaryExpression node) {
-    if (identical(_oldNode, node.leftOperand)) {
-      throw new InsufficientContextException();
-    } else if (identical(_oldNode, node.rightOperand)) {
-      throw new InsufficientContextException();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitBlock(Block node) {
-    if (node.statements.contains(_oldNode)) {
-      return _parser.parseStatement2();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitBlockFunctionBody(BlockFunctionBody node) {
-    if (identical(_oldNode, node.block)) {
-      return _parser.parseBlock();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitBooleanLiteral(BooleanLiteral node) => _notAChild(node);
-
-  @override
-  AstNode visitBreakStatement(BreakStatement node) {
-    if (identical(_oldNode, node.label)) {
-      return _parser.parseSimpleIdentifier();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitCascadeExpression(CascadeExpression node) {
-    if (identical(_oldNode, node.target)) {
-      return _parser.parseConditionalExpression();
-    } else if (node.cascadeSections.contains(_oldNode)) {
-      throw new InsufficientContextException();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitCatchClause(CatchClause node) {
-    if (identical(_oldNode, node.exceptionType)) {
-      return _parser.parseTypeName();
-    } else if (identical(_oldNode, node.exceptionParameter)) {
-      return _parser.parseSimpleIdentifier();
-    } else if (identical(_oldNode, node.stackTraceParameter)) {
-      return _parser.parseSimpleIdentifier();
-    } else if (identical(_oldNode, node.body)) {
-      return _parser.parseBlock();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitClassDeclaration(ClassDeclaration node) {
-    if (identical(_oldNode, node.documentationComment)) {
-      throw new InsufficientContextException();
-    } else if (node.metadata.contains(_oldNode)) {
-      return _parser.parseAnnotation();
-    } else if (identical(_oldNode, node.name)) {
-      // Changing the class name changes whether a member is interpreted as a
-      // constructor or not, so we'll just have to re-parse the entire class.
-      throw new InsufficientContextException();
-    } else if (identical(_oldNode, node.typeParameters)) {
-      return _parser.parseTypeParameterList();
-    } else if (identical(_oldNode, node.extendsClause)) {
-      return _parser.parseExtendsClause();
-    } else if (identical(_oldNode, node.withClause)) {
-      return _parser.parseWithClause();
-    } else if (identical(_oldNode, node.implementsClause)) {
-      return _parser.parseImplementsClause();
-    } else if (node.members.contains(_oldNode)) {
-      ClassMember member = _parser.parseClassMember(node.name.name);
-      if (member == null) {
-        throw new InsufficientContextException();
-      }
-      return member;
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitClassTypeAlias(ClassTypeAlias node) {
-    if (identical(_oldNode, node.documentationComment)) {
-      throw new InsufficientContextException();
-    } else if (node.metadata.contains(_oldNode)) {
-      return _parser.parseAnnotation();
-    } else if (identical(_oldNode, node.name)) {
-      return _parser.parseSimpleIdentifier();
-    } else if (identical(_oldNode, node.typeParameters)) {
-      return _parser.parseTypeParameterList();
-    } else if (identical(_oldNode, node.superclass)) {
-      return _parser.parseTypeName();
-    } else if (identical(_oldNode, node.withClause)) {
-      return _parser.parseWithClause();
-    } else if (identical(_oldNode, node.implementsClause)) {
-      return _parser.parseImplementsClause();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitComment(Comment node) {
-    throw new InsufficientContextException();
-  }
-
-  @override
-  AstNode visitCommentReference(CommentReference node) {
-    if (identical(_oldNode, node.identifier)) {
-      return _parser.parsePrefixedIdentifier();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitCompilationUnit(CompilationUnit node) {
-    throw new InsufficientContextException();
-  }
-
-  @override
-  AstNode visitConditionalExpression(ConditionalExpression node) {
-    if (identical(_oldNode, node.condition)) {
-      return _parser.parseIfNullExpression();
-    } else if (identical(_oldNode, node.thenExpression)) {
-      return _parser.parseExpressionWithoutCascade();
-    } else if (identical(_oldNode, node.elseExpression)) {
-      return _parser.parseExpressionWithoutCascade();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitConstructorDeclaration(ConstructorDeclaration node) {
-    if (identical(_oldNode, node.documentationComment)) {
-      throw new InsufficientContextException();
-    } else if (node.metadata.contains(_oldNode)) {
-      return _parser.parseAnnotation();
-    } else if (identical(_oldNode, node.returnType)) {
-      throw new InsufficientContextException();
-    } else if (identical(_oldNode, node.name)) {
-      throw new InsufficientContextException();
-    } else if (identical(_oldNode, node.parameters)) {
-      return _parser.parseFormalParameterList();
-    } else if (identical(_oldNode, node.redirectedConstructor)) {
-      throw new InsufficientContextException();
-    } else if (node.initializers.contains(_oldNode)) {
-      throw new InsufficientContextException();
-    } else if (identical(_oldNode, node.body)) {
-      throw new InsufficientContextException();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitConstructorFieldInitializer(ConstructorFieldInitializer node) {
-    if (identical(_oldNode, node.fieldName)) {
-      return _parser.parseSimpleIdentifier();
-    } else if (identical(_oldNode, node.expression)) {
-      throw new InsufficientContextException();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitConstructorName(ConstructorName node) {
-    if (identical(_oldNode, node.type)) {
-      return _parser.parseTypeName();
-    } else if (identical(_oldNode, node.name)) {
-      return _parser.parseSimpleIdentifier();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitContinueStatement(ContinueStatement node) {
-    if (identical(_oldNode, node.label)) {
-      return _parser.parseSimpleIdentifier();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitDeclaredIdentifier(DeclaredIdentifier node) {
-    if (identical(_oldNode, node.documentationComment)) {
-      throw new InsufficientContextException();
-    } else if (node.metadata.contains(_oldNode)) {
-      return _parser.parseAnnotation();
-    } else if (identical(_oldNode, node.type)) {
-      throw new InsufficientContextException();
-    } else if (identical(_oldNode, node.identifier)) {
-      return _parser.parseSimpleIdentifier();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitDefaultFormalParameter(DefaultFormalParameter node) {
-    if (identical(_oldNode, node.parameter)) {
-      return _parser.parseNormalFormalParameter();
-    } else if (identical(_oldNode, node.defaultValue)) {
-      return _parser.parseExpression2();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitDoStatement(DoStatement node) {
-    if (identical(_oldNode, node.body)) {
-      return _parser.parseStatement2();
-    } else if (identical(_oldNode, node.condition)) {
-      return _parser.parseExpression2();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitDoubleLiteral(DoubleLiteral node) => _notAChild(node);
-
-  @override
-  AstNode visitEmptyFunctionBody(EmptyFunctionBody node) => _notAChild(node);
-
-  @override
-  AstNode visitEmptyStatement(EmptyStatement node) => _notAChild(node);
-
-  @override
-  AstNode visitEnumConstantDeclaration(EnumConstantDeclaration node) {
-    if (identical(_oldNode, node.documentationComment)) {
-      throw new InsufficientContextException();
-    } else if (node.metadata.contains(_oldNode)) {
-      return _parser.parseAnnotation();
-    } else if (identical(_oldNode, node.name)) {
-      return _parser.parseSimpleIdentifier();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitEnumDeclaration(EnumDeclaration node) {
-    if (identical(_oldNode, node.documentationComment)) {
-      throw new InsufficientContextException();
-    } else if (node.metadata.contains(_oldNode)) {
-      return _parser.parseAnnotation();
-    } else if (identical(_oldNode, node.name)) {
-      return _parser.parseSimpleIdentifier();
-    } else if (node.constants.contains(_oldNode)) {
-      throw new InsufficientContextException();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitExportDirective(ExportDirective node) {
-    if (identical(_oldNode, node.documentationComment)) {
-      throw new InsufficientContextException();
-    } else if (node.metadata.contains(_oldNode)) {
-      return _parser.parseAnnotation();
-    } else if (identical(_oldNode, node.uri)) {
-      return _parser.parseStringLiteral();
-    } else if (node.combinators.contains(_oldNode)) {
-      throw new IncrementalParseException();
-      //return parser.parseCombinator();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitExpressionFunctionBody(ExpressionFunctionBody node) {
-    if (identical(_oldNode, node.expression)) {
-      return _parser.parseExpression2();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitExpressionStatement(ExpressionStatement node) {
-    if (identical(_oldNode, node.expression)) {
-      return _parser.parseExpression2();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitExtendsClause(ExtendsClause node) {
-    if (identical(_oldNode, node.superclass)) {
-      return _parser.parseTypeName();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitFieldDeclaration(FieldDeclaration node) {
-    if (identical(_oldNode, node.documentationComment)) {
-      throw new InsufficientContextException();
-    } else if (node.metadata.contains(_oldNode)) {
-      return _parser.parseAnnotation();
-    } else if (identical(_oldNode, node.fields)) {
-      throw new InsufficientContextException();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitFieldFormalParameter(FieldFormalParameter node) {
-    if (identical(_oldNode, node.documentationComment)) {
-      throw new InsufficientContextException();
-    } else if (node.metadata.contains(_oldNode)) {
-      return _parser.parseAnnotation();
-    } else if (identical(_oldNode, node.type)) {
-      return _parser.parseTypeName();
-    } else if (identical(_oldNode, node.identifier)) {
-      return _parser.parseSimpleIdentifier();
-    } else if (identical(_oldNode, node.parameters)) {
-      return _parser.parseFormalParameterList();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitForEachStatement(ForEachStatement node) {
-    if (identical(_oldNode, node.loopVariable)) {
-      throw new InsufficientContextException();
-      //return parser.parseDeclaredIdentifier();
-    } else if (identical(_oldNode, node.identifier)) {
-      return _parser.parseSimpleIdentifier();
-    } else if (identical(_oldNode, node.body)) {
-      return _parser.parseStatement2();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitFormalParameterList(FormalParameterList node) {
-    // We don't know which kind of parameter to parse.
-    throw new InsufficientContextException();
-  }
-
-  @override
-  AstNode visitForStatement(ForStatement node) {
-    if (identical(_oldNode, node.variables)) {
-      throw new InsufficientContextException();
-    } else if (identical(_oldNode, node.initialization)) {
-      throw new InsufficientContextException();
-    } else if (identical(_oldNode, node.condition)) {
-      return _parser.parseExpression2();
-    } else if (node.updaters.contains(_oldNode)) {
-      return _parser.parseExpression2();
-    } else if (identical(_oldNode, node.body)) {
-      return _parser.parseStatement2();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitFunctionDeclaration(FunctionDeclaration node) {
-    if (identical(_oldNode, node.documentationComment)) {
-      throw new InsufficientContextException();
-    } else if (node.metadata.contains(_oldNode)) {
-      return _parser.parseAnnotation();
-    } else if (identical(_oldNode, node.returnType)) {
-      return _parser.parseReturnType();
-    } else if (identical(_oldNode, node.name)) {
-      return _parser.parseSimpleIdentifier();
-    } else if (identical(_oldNode, node.functionExpression)) {
-      throw new InsufficientContextException();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitFunctionDeclarationStatement(FunctionDeclarationStatement node) {
-    if (identical(_oldNode, node.functionDeclaration)) {
-      throw new InsufficientContextException();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitFunctionExpression(FunctionExpression node) {
-    if (identical(_oldNode, node.parameters)) {
-      return _parser.parseFormalParameterList();
-    } else if (identical(_oldNode, node.body)) {
-      throw new InsufficientContextException();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitFunctionExpressionInvocation(FunctionExpressionInvocation node) {
-    if (identical(_oldNode, node.function)) {
-      throw new InsufficientContextException();
-    } else if (identical(_oldNode, node.argumentList)) {
-      return _parser.parseArgumentList();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitFunctionTypeAlias(FunctionTypeAlias node) {
-    if (identical(_oldNode, node.documentationComment)) {
-      throw new InsufficientContextException();
-    } else if (node.metadata.contains(_oldNode)) {
-      return _parser.parseAnnotation();
-    } else if (identical(_oldNode, node.returnType)) {
-      return _parser.parseReturnType();
-    } else if (identical(_oldNode, node.name)) {
-      return _parser.parseSimpleIdentifier();
-    } else if (identical(_oldNode, node.typeParameters)) {
-      return _parser.parseTypeParameterList();
-    } else if (identical(_oldNode, node.parameters)) {
-      return _parser.parseFormalParameterList();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitFunctionTypedFormalParameter(FunctionTypedFormalParameter node) {
-    if (identical(_oldNode, node.documentationComment)) {
-      throw new InsufficientContextException();
-    } else if (node.metadata.contains(_oldNode)) {
-      return _parser.parseAnnotation();
-    } else if (identical(_oldNode, node.returnType)) {
-      return _parser.parseReturnType();
-    } else if (identical(_oldNode, node.identifier)) {
-      return _parser.parseSimpleIdentifier();
-    } else if (identical(_oldNode, node.parameters)) {
-      return _parser.parseFormalParameterList();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitHideCombinator(HideCombinator node) {
-    if (node.hiddenNames.contains(_oldNode)) {
-      return _parser.parseSimpleIdentifier();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitIfStatement(IfStatement node) {
-    if (identical(_oldNode, node.condition)) {
-      return _parser.parseExpression2();
-    } else if (identical(_oldNode, node.thenStatement)) {
-      return _parser.parseStatement2();
-    } else if (identical(_oldNode, node.elseStatement)) {
-      return _parser.parseStatement2();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitImplementsClause(ImplementsClause node) {
-    if (node.interfaces.contains(node)) {
-      return _parser.parseTypeName();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitImportDirective(ImportDirective node) {
-    if (identical(_oldNode, node.documentationComment)) {
-      throw new InsufficientContextException();
-    } else if (node.metadata.contains(_oldNode)) {
-      return _parser.parseAnnotation();
-    } else if (identical(_oldNode, node.uri)) {
-      return _parser.parseStringLiteral();
-    } else if (identical(_oldNode, node.prefix)) {
-      return _parser.parseSimpleIdentifier();
-    } else if (node.combinators.contains(_oldNode)) {
-      return _parser.parseCombinator();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitIndexExpression(IndexExpression node) {
-    if (identical(_oldNode, node.target)) {
-      throw new InsufficientContextException();
-    } else if (identical(_oldNode, node.index)) {
-      return _parser.parseExpression2();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitInstanceCreationExpression(InstanceCreationExpression node) {
-    if (identical(_oldNode, node.constructorName)) {
-      return _parser.parseConstructorName();
-    } else if (identical(_oldNode, node.argumentList)) {
-      return _parser.parseArgumentList();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitIntegerLiteral(IntegerLiteral node) => _notAChild(node);
-
-  @override
-  AstNode visitInterpolationExpression(InterpolationExpression node) {
-    if (identical(_oldNode, node.expression)) {
-      if (node.leftBracket == null) {
-        throw new InsufficientContextException();
-        //return parser.parseThisOrSimpleIdentifier();
-      }
-      return _parser.parseExpression2();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitInterpolationString(InterpolationString node) {
-    throw new InsufficientContextException();
-  }
-
-  @override
-  AstNode visitIsExpression(IsExpression node) {
-    if (identical(_oldNode, node.expression)) {
-      return _parser.parseBitwiseOrExpression();
-    } else if (identical(_oldNode, node.type)) {
-      return _parser.parseTypeName();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitLabel(Label node) {
-    if (identical(_oldNode, node.label)) {
-      return _parser.parseSimpleIdentifier();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitLabeledStatement(LabeledStatement node) {
-    if (node.labels.contains(_oldNode)) {
-      return _parser.parseLabel();
-    } else if (identical(_oldNode, node.statement)) {
-      return _parser.parseStatement2();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitLibraryDirective(LibraryDirective node) {
-    if (identical(_oldNode, node.documentationComment)) {
-      throw new InsufficientContextException();
-    } else if (node.metadata.contains(_oldNode)) {
-      return _parser.parseAnnotation();
-    } else if (identical(_oldNode, node.name)) {
-      return _parser.parseLibraryIdentifier();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitLibraryIdentifier(LibraryIdentifier node) {
-    if (node.components.contains(_oldNode)) {
-      return _parser.parseSimpleIdentifier();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitListLiteral(ListLiteral node) {
-    if (identical(_oldNode, node.typeArguments)) {
-      return _parser.parseTypeArgumentList();
-    } else if (node.elements.contains(_oldNode)) {
-      return _parser.parseExpression2();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitMapLiteral(MapLiteral node) {
-    if (identical(_oldNode, node.typeArguments)) {
-      return _parser.parseTypeArgumentList();
-    } else if (node.entries.contains(_oldNode)) {
-      return _parser.parseMapLiteralEntry();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitMapLiteralEntry(MapLiteralEntry node) {
-    if (identical(_oldNode, node.key)) {
-      return _parser.parseExpression2();
-    } else if (identical(_oldNode, node.value)) {
-      return _parser.parseExpression2();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitMethodDeclaration(MethodDeclaration node) {
-    if (identical(_oldNode, node.documentationComment)) {
-      throw new InsufficientContextException();
-    } else if (node.metadata.contains(_oldNode)) {
-      return _parser.parseAnnotation();
-    } else if (identical(_oldNode, node.returnType)) {
-      throw new InsufficientContextException();
-      //return parser.parseTypeName();
-      //return parser.parseReturnType();
-    } else if (identical(_oldNode, node.name)) {
-      if (node.operatorKeyword != null) {
-        throw new InsufficientContextException();
-      }
-      return _parser.parseSimpleIdentifier();
-    } else if (identical(_oldNode, node.body)) {
-      //return parser.parseFunctionBody();
-      throw new InsufficientContextException();
-    } else if (identical(_oldNode, node.parameters)) {
-      // TODO(paulberry): if we want errors to be correct, we'll need to also
-      // call _validateFormalParameterList, and sometimes
-      // _validateModifiersForGetterOrSetterOrMethod.
-      return _parser.parseFormalParameterList();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitMethodInvocation(MethodInvocation node) {
-    if (identical(_oldNode, node.target)) {
-      throw new IncrementalParseException();
-    } else if (identical(_oldNode, node.methodName)) {
-      return _parser.parseSimpleIdentifier();
-    } else if (identical(_oldNode, node.argumentList)) {
-      return _parser.parseArgumentList();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitNamedExpression(NamedExpression node) {
-    if (identical(_oldNode, node.name)) {
-      return _parser.parseLabel();
-    } else if (identical(_oldNode, node.expression)) {
-      return _parser.parseExpression2();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitNativeClause(NativeClause node) {
-    if (identical(_oldNode, node.name)) {
-      return _parser.parseStringLiteral();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitNativeFunctionBody(NativeFunctionBody node) {
-    if (identical(_oldNode, node.stringLiteral)) {
-      return _parser.parseStringLiteral();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitNullLiteral(NullLiteral node) => _notAChild(node);
-
-  @override
-  AstNode visitParenthesizedExpression(ParenthesizedExpression node) {
-    if (identical(_oldNode, node.expression)) {
-      return _parser.parseExpression2();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitPartDirective(PartDirective node) {
-    if (identical(_oldNode, node.documentationComment)) {
-      throw new InsufficientContextException();
-    } else if (node.metadata.contains(_oldNode)) {
-      return _parser.parseAnnotation();
-    } else if (identical(_oldNode, node.uri)) {
-      return _parser.parseStringLiteral();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitPartOfDirective(PartOfDirective node) {
-    if (identical(_oldNode, node.documentationComment)) {
-      throw new InsufficientContextException();
-    } else if (node.metadata.contains(_oldNode)) {
-      return _parser.parseAnnotation();
-    } else if (identical(_oldNode, node.libraryName)) {
-      return _parser.parseLibraryIdentifier();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitPostfixExpression(PostfixExpression node) {
-    if (identical(_oldNode, node.operand)) {
-      throw new InsufficientContextException();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitPrefixedIdentifier(PrefixedIdentifier node) {
-    if (identical(_oldNode, node.prefix)) {
-      return _parser.parseSimpleIdentifier();
-    } else if (identical(_oldNode, node.identifier)) {
-      return _parser.parseSimpleIdentifier();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitPrefixExpression(PrefixExpression node) {
-    if (identical(_oldNode, node.operand)) {
-      throw new InsufficientContextException();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitPropertyAccess(PropertyAccess node) {
-    if (identical(_oldNode, node.target)) {
-      throw new InsufficientContextException();
-    } else if (identical(_oldNode, node.propertyName)) {
-      return _parser.parseSimpleIdentifier();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitRedirectingConstructorInvocation(
-      RedirectingConstructorInvocation node) {
-    if (identical(_oldNode, node.constructorName)) {
-      return _parser.parseSimpleIdentifier();
-    } else if (identical(_oldNode, node.argumentList)) {
-      return _parser.parseArgumentList();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitRethrowExpression(RethrowExpression node) => _notAChild(node);
-
-  @override
-  AstNode visitReturnStatement(ReturnStatement node) {
-    if (identical(_oldNode, node.expression)) {
-      return _parser.parseExpression2();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitScriptTag(ScriptTag node) => _notAChild(node);
-
-  @override
-  AstNode visitShowCombinator(ShowCombinator node) {
-    if (node.shownNames.contains(_oldNode)) {
-      return _parser.parseSimpleIdentifier();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitSimpleFormalParameter(SimpleFormalParameter node) {
-    if (identical(_oldNode, node.documentationComment)) {
-      throw new InsufficientContextException();
-    } else if (node.metadata.contains(_oldNode)) {
-      return _parser.parseAnnotation();
-    } else if (identical(_oldNode, node.type)) {
-      throw new InsufficientContextException();
-    } else if (identical(_oldNode, node.identifier)) {
-      throw new InsufficientContextException();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitSimpleIdentifier(SimpleIdentifier node) => _notAChild(node);
-
-  @override
-  AstNode visitSimpleStringLiteral(SimpleStringLiteral node) =>
-      _notAChild(node);
-
-  @override
-  AstNode visitStringInterpolation(StringInterpolation node) {
-    if (node.elements.contains(_oldNode)) {
-      throw new InsufficientContextException();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitSuperConstructorInvocation(SuperConstructorInvocation node) {
-    if (identical(_oldNode, node.constructorName)) {
-      return _parser.parseSimpleIdentifier();
-    } else if (identical(_oldNode, node.argumentList)) {
-      return _parser.parseArgumentList();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitSuperExpression(SuperExpression node) => _notAChild(node);
-
-  @override
-  AstNode visitSwitchCase(SwitchCase node) {
-    if (node.labels.contains(_oldNode)) {
-      return _parser.parseLabel();
-    } else if (identical(_oldNode, node.expression)) {
-      return _parser.parseExpression2();
-    } else if (node.statements.contains(_oldNode)) {
-      return _parser.parseStatement2();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitSwitchDefault(SwitchDefault node) {
-    if (node.labels.contains(_oldNode)) {
-      return _parser.parseLabel();
-    } else if (node.statements.contains(_oldNode)) {
-      return _parser.parseStatement2();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitSwitchStatement(SwitchStatement node) {
-    if (identical(_oldNode, node.expression)) {
-      return _parser.parseExpression2();
-    } else if (node.members.contains(_oldNode)) {
-      throw new InsufficientContextException();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitSymbolLiteral(SymbolLiteral node) => _notAChild(node);
-
-  @override
-  AstNode visitThisExpression(ThisExpression node) => _notAChild(node);
-
-  @override
-  AstNode visitThrowExpression(ThrowExpression node) {
-    if (identical(_oldNode, node.expression)) {
-      if (_isCascadeAllowedInThrow(node)) {
-        return _parser.parseExpression2();
-      }
-      return _parser.parseExpressionWithoutCascade();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitTopLevelVariableDeclaration(TopLevelVariableDeclaration node) {
-    if (identical(_oldNode, node.documentationComment)) {
-      throw new InsufficientContextException();
-    } else if (node.metadata.contains(_oldNode)) {
-      return _parser.parseAnnotation();
-    } else if (identical(_oldNode, node.variables)) {
-      throw new InsufficientContextException();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitTryStatement(TryStatement node) {
-    if (identical(_oldNode, node.body)) {
-      return _parser.parseBlock();
-    } else if (node.catchClauses.contains(_oldNode)) {
-      throw new InsufficientContextException();
-    } else if (identical(_oldNode, node.finallyBlock)) {
-      throw new InsufficientContextException();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitTypeArgumentList(TypeArgumentList node) {
-    if (node.arguments.contains(_oldNode)) {
-      return _parser.parseTypeName();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitTypeName(TypeName node) {
-    if (identical(_oldNode, node.name)) {
-      return _parser.parsePrefixedIdentifier();
-    } else if (identical(_oldNode, node.typeArguments)) {
-      return _parser.parseTypeArgumentList();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitTypeParameter(TypeParameter node) {
-    if (identical(_oldNode, node.documentationComment)) {
-      throw new InsufficientContextException();
-    } else if (node.metadata.contains(_oldNode)) {
-      return _parser.parseAnnotation();
-    } else if (identical(_oldNode, node.name)) {
-      return _parser.parseSimpleIdentifier();
-    } else if (identical(_oldNode, node.bound)) {
-      return _parser.parseTypeName();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitTypeParameterList(TypeParameterList node) {
-    if (node.typeParameters.contains(node)) {
-      return _parser.parseTypeParameter();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitVariableDeclaration(VariableDeclaration node) {
-    if (identical(_oldNode, node.documentationComment)) {
-      throw new InsufficientContextException();
-    } else if (node.metadata.contains(_oldNode)) {
-      return _parser.parseAnnotation();
-    } else if (identical(_oldNode, node.name)) {
-      throw new InsufficientContextException();
-    } else if (identical(_oldNode, node.initializer)) {
-      throw new InsufficientContextException();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitVariableDeclarationList(VariableDeclarationList node) {
-    if (identical(_oldNode, node.documentationComment)) {
-      throw new InsufficientContextException();
-    } else if (node.metadata.contains(_oldNode)) {
-      return _parser.parseAnnotation();
-    } else if (identical(_oldNode, node.type)) {
-      // There is not enough context to know whether we should reparse the type
-      // using parseReturnType() (which allows 'void') or parseTypeName()
-      // (which doesn't).  Note that even though the language disallows
-      // variables of type 'void', the parser sometimes accepts them in the
-      // course of error recovery (e.g. "class C { void v; }"
-      throw new InsufficientContextException();
-    } else if (node.variables.contains(_oldNode)) {
-      throw new InsufficientContextException();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitVariableDeclarationStatement(VariableDeclarationStatement node) {
-    if (identical(_oldNode, node.variables)) {
-      throw new InsufficientContextException();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitWhileStatement(WhileStatement node) {
-    if (identical(_oldNode, node.condition)) {
-      return _parser.parseExpression2();
-    } else if (identical(_oldNode, node.body)) {
-      return _parser.parseStatement2();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitWithClause(WithClause node) {
-    if (node.mixinTypes.contains(node)) {
-      return _parser.parseTypeName();
-    }
-    return _notAChild(node);
-  }
-
-  @override
-  AstNode visitYieldStatement(YieldStatement node) {
-    if (identical(_oldNode, node.expression)) {
-      return _parser.parseExpression2();
-    }
-    return _notAChild(node);
-  }
-
-  /**
-   * Return `true` if the given assignment [expression] can have a cascade
-   * expression on the right-hand side.
-   */
-  bool _isCascadeAllowedInAssignment(AssignmentExpression expression) {
-    // TODO(brianwilkerson) Implement this method.
-    throw new InsufficientContextException();
-  }
-
-  /**
-   * Return `true` if the given throw [expression] can have a cascade
-   * expression.
-   */
-  bool _isCascadeAllowedInThrow(ThrowExpression expression) {
-    // TODO(brianwilkerson) Implement this method.
-    throw new InsufficientContextException();
-  }
-
-  /**
-   * Throw an exception indicating that the visited [node] was not the parent of
-   * the node to be replaced.
-   */
-  AstNode _notAChild(AstNode node) {
-    throw new IncrementalParseException.con1(
-        "Internal error: the visited node (a ${node.runtimeType}) was not the parent of the node to be replaced (a ${_oldNode.runtimeType})");
-  }
-}
-
-/**
- * An exception that occurred while attempting to parse a replacement for a
- * specified node in an existing AST structure.
- */
-class IncrementalParseException extends RuntimeException {
-  /**
-   * Initialize a newly created exception to have no message and to be its own
-   * cause.
-   */
-  IncrementalParseException() : super();
-
-  /**
-   * Initialize a newly created exception to have the given [message] and to be
-   * its own cause.
-   */
-  IncrementalParseException.con1(String message) : super(message: message);
-
-  /**
-   * Initialize a newly created exception to have no message and to have the
-   * given [cause].
-   */
-  IncrementalParseException.con2(Exception cause) : super(cause: cause);
-}
-
-/**
- * An object used to re-parse a single AST structure within a larger AST
- * structure.
- */
-class IncrementalParser {
-  /**
-   * The source being parsed.
-   */
-  final Source _source;
-
-  /**
-   * A map from old tokens to new tokens used during the cloning process.
-   */
-  final TokenMap _tokenMap;
-
-  /**
-   * The error listener that will be informed of any errors that are found
-   * during the parse.
-   */
-  final AnalysisErrorListener _errorListener;
-
-  /**
-   * The node in the AST structure that contains the revised content.
-   */
-  AstNode _updatedNode;
-
-  /**
-   * Initialize a newly created incremental parser to parse a portion of the
-   * content of the given [_source]. The [_tokenMap] is a map from old tokens to
-   * new tokens that is used during the cloning process. The [_errorListener]
-   * will be informed of any errors that are found during the parse.
-   */
-  IncrementalParser(this._source, this._tokenMap, this._errorListener);
-
-  /**
-   * Return the node in the AST structure that contains the revised content.
-   */
-  AstNode get updatedNode => _updatedNode;
-
-  /**
-   * Given a range of tokens that were re-scanned, re-parse the minimum number
-   * of tokens to produce a consistent AST structure. The range is represented
-   * by the first and last tokens in the range.
-   *
-   * More specifically, the [leftToken] is the token in the new token stream
-   * immediately to the left of the range of tokens that were inserted and the
-   * [rightToken] is the token in the new token stream immediately to the right
-   * of the range of tokens that were inserted. The [originalStart] and
-   * [originalEnd] are the offsets in the original source of the first and last
-   * characters that were modified.
-   *
-   * The tokens are assumed to be contained in the same token stream.
-   */
-  AstNode reparse(AstNode originalStructure, Token leftToken, Token rightToken,
-      int originalStart, int originalEnd) {
-    AstNode oldNode = null;
-    AstNode newNode = null;
-    //
-    // Find the first token that needs to be re-parsed.
-    //
-    Token firstToken = leftToken.next;
-    if (identical(firstToken, rightToken)) {
-      // If there are no new tokens, then we need to include at least one copied
-      // node in the range.
-      firstToken = leftToken;
-    }
-    //
-    // Find the smallest AST node that encompasses the range of re-scanned
-    // tokens.
-    //
-    if (originalEnd < originalStart) {
-      oldNode = new NodeLocator(originalStart).searchWithin(originalStructure);
-    } else {
-      oldNode = new NodeLocator(originalStart, originalEnd)
-          .searchWithin(originalStructure);
-    }
-    //
-    // Find the token at which parsing is to begin.
-    //
-    int originalOffset = oldNode.offset;
-    Token parseToken = _findTokenAt(firstToken, originalOffset);
-    if (parseToken == null) {
-      return null;
-    }
-    //
-    // Parse the appropriate AST structure starting at the appropriate place.
-    //
-    Parser parser = new Parser(_source, _errorListener);
-    parser.currentToken = parseToken;
-    while (newNode == null) {
-      AstNode parent = oldNode.parent;
-      if (parent == null) {
-        parseToken = _findFirstToken(parseToken);
-        parser.currentToken = parseToken;
-        return parser.parseCompilationUnit2();
-      }
-      bool advanceToParent = false;
-      try {
-        IncrementalParseDispatcher dispatcher =
-            new IncrementalParseDispatcher(parser, oldNode);
-        IncrementalParseStateBuilder contextBuilder =
-            new IncrementalParseStateBuilder(parser);
-        contextBuilder.buildState(oldNode);
-        newNode = parent.accept(dispatcher);
-        //
-        // Validate that the new node can replace the old node.
-        //
-        Token mappedToken = _tokenMap.get(oldNode.endToken.next);
-        if (mappedToken == null ||
-            newNode == null ||
-            mappedToken.offset != newNode.endToken.next.offset ||
-            newNode.offset != oldNode.offset) {
-          advanceToParent = true;
-        }
-      } on InsufficientContextException {
-        advanceToParent = true;
-      } catch (exception) {
-        return null;
-      }
-      if (advanceToParent) {
-        newNode = null;
-        oldNode = parent;
-        originalOffset = oldNode.offset;
-        parseToken = _findTokenAt(parseToken, originalOffset);
-        parser.currentToken = parseToken;
-      }
-    }
-    _updatedNode = newNode;
-    //
-    // Replace the old node with the new node in a copy of the original AST
-    // structure.
-    //
-    if (identical(oldNode, originalStructure)) {
-      // We ended up re-parsing the whole structure, so there's no need for a
-      // copy.
-      ResolutionCopier.copyResolutionData(oldNode, newNode);
-      return newNode;
-    }
-    ResolutionCopier.copyResolutionData(oldNode, newNode);
-    IncrementalAstCloner cloner =
-        new IncrementalAstCloner(oldNode, newNode, _tokenMap);
-    return originalStructure.accept(cloner) as AstNode;
-  }
-
-  /**
-   * Return the first (non-EOF) token in the token stream containing the
-   * [firstToken].
-   */
-  Token _findFirstToken(Token firstToken) {
-    while (firstToken.type != TokenType.EOF) {
-      firstToken = firstToken.previous;
-    }
-    return firstToken.next;
-  }
-
-  /**
-   * Find the token at or before the [firstToken] with the given [offset], or
-   * `null` if there is no such token.
-   */
-  Token _findTokenAt(Token firstToken, int offset) {
-    while (firstToken.offset > offset && firstToken.type != TokenType.EOF) {
-      firstToken = firstToken.previous;
-    }
-    return firstToken;
-  }
-}
-
-/**
- * A visitor capable of inferring the correct parser state for incremental
- * parsing.  This visitor visits each parent/child relationship in the chain of
- * ancestors of the node to be replaced (starting with the root of the parse
- * tree), updating the parser to the correct state for parsing the child of the
- * given parent.  Once it has visited all of these relationships, the parser
- * will be in the correct state for reparsing the node to be replaced.
- */
-class IncrementalParseStateBuilder extends SimpleAstVisitor {
-  // TODO(paulberry): add support for other pieces of parser state (_inAsync,
-  // _inGenerator, _inLoop, and _inSwitch).  Note that _inLoop and _inSwitch
-  // only affect error message generation.
-
-  /**
-   * The parser whose state should be built.
-   */
-  final Parser _parser;
-
-  /**
-   * The child node in the parent/child relationship currently being visited.
-   * (The corresponding parent is the node passed to the visit...() function.)
-   */
-  AstNode _childNode;
-
-  /**
-   * Create an IncrementalParseStateBuilder which will build the correct state
-   * for [_parser].
-   */
-  IncrementalParseStateBuilder(this._parser);
-
-  /**
-   * Build the correct parser state for parsing a replacement for [node].
-   */
-  void buildState(AstNode node) {
-    List<AstNode> ancestors = <AstNode>[];
-    while (node != null) {
-      ancestors.add(node);
-      node = node.parent;
-    }
-    _parser._inInitializer = false;
-    for (int i = ancestors.length - 2; i >= 0; i--) {
-      _childNode = ancestors[i];
-      ancestors[i + 1].accept(this);
-    }
-  }
-
-  @override
-  void visitArgumentList(ArgumentList node) {
-    _parser._inInitializer = false;
-  }
-
-  @override
-  void visitConstructorFieldInitializer(ConstructorFieldInitializer node) {
-    if (identical(_childNode, node.expression)) {
-      _parser._inInitializer = true;
-    }
-  }
-
-  @override
-  void visitIndexExpression(IndexExpression node) {
-    if (identical(_childNode, node.index)) {
-      _parser._inInitializer = false;
-    }
-  }
-
-  @override
-  void visitInterpolationExpression(InterpolationExpression node) {
-    if (identical(_childNode, node.expression)) {
-      _parser._inInitializer = false;
-    }
-  }
-
-  @override
-  void visitListLiteral(ListLiteral node) {
-    if (node.elements.contains(_childNode)) {
-      _parser._inInitializer = false;
-    }
-  }
-
-  @override
-  void visitMapLiteral(MapLiteral node) {
-    if (node.entries.contains(_childNode)) {
-      _parser._inInitializer = false;
-    }
-  }
-
-  @override
-  void visitParenthesizedExpression(ParenthesizedExpression node) {
-    if (identical(_childNode, node.expression)) {
-      _parser._inInitializer = false;
-    }
-  }
-}
-
-/**
- * An exception indicating that an AST node cannot be re-parsed because there is
- * not enough context to know how to re-parse the node. Clients can attempt to
- * re-parse the parent of the node.
- */
-class InsufficientContextException extends IncrementalParseException {
-  /**
-   * Initialize a newly created exception to have no message and to be its own
-   * cause.
-   */
-  InsufficientContextException() : super();
-
-  /**
-   * Initialize a newly created exception to have the given [message] and to be
-   * its own cause.
-   */
-  InsufficientContextException.con1(String message) : super.con1(message);
-
-  /**
-   * Initialize a newly created exception to have no message and to have the
-   * given [cause].
-   */
-  InsufficientContextException.con2(Exception cause) : super.con2(cause);
-}
-
-/**
- * Wrapper around [Function] which should be called with "target" and
- * "arguments".
- */
-class MethodTrampoline {
-  int parameterCount;
-  Function trampoline;
-  MethodTrampoline(this.parameterCount, this.trampoline);
-  Object invoke(target, List arguments) {
-    if (arguments.length != parameterCount) {
-      throw new IllegalArgumentException(
-          "${arguments.length} != $parameterCount");
-    }
-    switch (parameterCount) {
-      case 0:
-        return trampoline(target);
-      case 1:
-        return trampoline(target, arguments[0]);
-      case 2:
-        return trampoline(target, arguments[0], arguments[1]);
-      case 3:
-        return trampoline(target, arguments[0], arguments[1], arguments[2]);
-      case 4:
-        return trampoline(
-            target, arguments[0], arguments[1], arguments[2], arguments[3]);
-      default:
-        throw new IllegalArgumentException("Not implemented for > 4 arguments");
-    }
-  }
-}
-
-/**
- * A simple data-holder for a method that needs to return multiple values.
- */
-class Modifiers {
-  /**
-   * The token representing the keyword 'abstract', or `null` if the keyword was
-   * not found.
-   */
-  Token abstractKeyword;
-
-  /**
-   * The token representing the keyword 'const', or `null` if the keyword was
-   * not found.
-   */
-  Token constKeyword;
-
-  /**
-   * The token representing the keyword 'external', or `null` if the keyword was
-   * not found.
-   */
-  Token externalKeyword;
-
-  /**
-   * The token representing the keyword 'factory', or `null` if the keyword was
-   * not found.
-   */
-  Token factoryKeyword;
-
-  /**
-   * The token representing the keyword 'final', or `null` if the keyword was
-   * not found.
-   */
-  Token finalKeyword;
-
-  /**
-   * The token representing the keyword 'static', or `null` if the keyword was
-   * not found.
-   */
-  Token staticKeyword;
-
-  /**
-   * The token representing the keyword 'var', or `null` if the keyword was not
-   * found.
-   */
-  Token varKeyword;
-
-  @override
-  String toString() {
-    StringBuffer buffer = new StringBuffer();
-    bool needsSpace = _appendKeyword(buffer, false, abstractKeyword);
-    needsSpace = _appendKeyword(buffer, needsSpace, constKeyword);
-    needsSpace = _appendKeyword(buffer, needsSpace, externalKeyword);
-    needsSpace = _appendKeyword(buffer, needsSpace, factoryKeyword);
-    needsSpace = _appendKeyword(buffer, needsSpace, finalKeyword);
-    needsSpace = _appendKeyword(buffer, needsSpace, staticKeyword);
-    _appendKeyword(buffer, needsSpace, varKeyword);
-    return buffer.toString();
-  }
-
-  /**
-   * If the given [keyword] is not `null`, append it to the given [builder],
-   * prefixing it with a space if [needsSpace] is `true`. Return `true` if
-   * subsequent keywords need to be prefixed with a space.
-   */
-  bool _appendKeyword(StringBuffer buffer, bool needsSpace, Token keyword) {
-    if (keyword != null) {
-      if (needsSpace) {
-        buffer.writeCharCode(0x20);
-      }
-      buffer.write(keyword.lexeme);
-      return true;
-    }
-    return needsSpace;
-  }
-}
-
-/**
- * A parser used to parse tokens into an AST structure.
- */
-class Parser {
-  static String ASYNC = "async";
-
-  static String _AWAIT = "await";
-
-  static String _HIDE = "hide";
-
-  static String _OF = "of";
-
-  static String _ON = "on";
-
-  static String _NATIVE = "native";
-
-  static String _SHOW = "show";
-
-  static String SYNC = "sync";
-
-  static String _YIELD = "yield";
-
-  /**
-   * The source being parsed.
-   */
-  final Source _source;
-
-  /**
-   * The error listener that will be informed of any errors that are found
-   * during the parse.
-   */
-  final AnalysisErrorListener _errorListener;
-
-  /**
-   * An [errorListener] lock, if more than `0`, then errors are not reported.
-   */
-  int _errorListenerLock = 0;
-
-  /**
-   * A flag indicating whether parser is to parse function bodies.
-   */
-  bool _parseFunctionBodies = true;
-
-  /**
-   * The next token to be parsed.
-   */
-  Token _currentToken;
-
-  /**
-   * A flag indicating whether the parser is currently in a function body marked
-   * as being 'async'.
-   */
-  bool _inAsync = false;
-
-  /**
-   * A flag indicating whether the parser is currently in a function body marked
-   * as being 'async'.
-   */
-  bool _inGenerator = false;
-
-  /**
-   * A flag indicating whether the parser is currently in the body of a loop.
-   */
-  bool _inLoop = false;
-
-  /**
-   * A flag indicating whether the parser is currently in a switch statement.
-   */
-  bool _inSwitch = false;
-
-  /**
-   * A flag indicating whether the parser is currently in a constructor field
-   * initializer, with no intervening parens, braces, or brackets.
-   */
-  bool _inInitializer = false;
-
-  /**
-   * A flag indicating whether the parser is to parse generic method syntax.
-   */
-  bool parseGenericMethods = false;
-
-  /**
-   * Initialize a newly created parser to parse the content of the given
-   * [_source] and to report any errors that are found to the given
-   * [_errorListener].
-   */
-  Parser(this._source, this._errorListener);
-
-  void set currentToken(Token currentToken) {
-    this._currentToken = currentToken;
-  }
-
-  /**
-   * Return `true` if the current token is the first token of a return type that
-   * is followed by an identifier, possibly followed by a list of type
-   * parameters, followed by a left-parenthesis. This is used by
-   * [_parseTypeAlias] to determine whether or not to parse a return type.
-   */
-  bool get hasReturnTypeInTypeAlias {
-    Token next = _skipReturnType(_currentToken);
-    if (next == null) {
-      return false;
-    }
-    return _tokenMatchesIdentifier(next);
-  }
-
-  /**
-   * Set whether the parser is to parse the async support.
-   */
-  @deprecated
-  void set parseAsync(bool parseAsync) {
-    // Async support cannot be disabled
-  }
-
-  /**
-   * Set whether the parser is to parse deferred libraries.
-   */
-  @deprecated
-  void set parseDeferredLibraries(bool parseDeferredLibraries) {
-    // Deferred libraries support cannot be disabled
-  }
-
-  /**
-   * Set whether the parser is to parse enum declarations.
-   */
-  @deprecated
-  void set parseEnum(bool parseEnum) {
-    // Enum support cannot be disabled
-  }
-
-  /**
-   * Set whether parser is to parse function bodies.
-   */
-  void set parseFunctionBodies(bool parseFunctionBodies) {
-    this._parseFunctionBodies = parseFunctionBodies;
-  }
-
-  /**
-   * Advance to the next token in the token stream, making it the new current
-   * token and return the token that was current before this method was invoked.
-   */
-  Token getAndAdvance() {
-    Token token = _currentToken;
-    _advance();
-    return token;
-  }
-
-  /**
-   * Parse an annotation. Return the annotation that was parsed.
-   *
-   *     annotation ::=
-   *         '@' qualified ('.' identifier)? arguments?
-   *
-   */
-  Annotation parseAnnotation() {
-    Token atSign = _expect(TokenType.AT);
-    Identifier name = parsePrefixedIdentifier();
-    Token period = null;
-    SimpleIdentifier constructorName = null;
-    if (_matches(TokenType.PERIOD)) {
-      period = getAndAdvance();
-      constructorName = parseSimpleIdentifier();
-    }
-    ArgumentList arguments = null;
-    if (_matches(TokenType.OPEN_PAREN)) {
-      arguments = parseArgumentList();
-    }
-    return new Annotation(atSign, name, period, constructorName, arguments);
-  }
-
-  /**
-   * Parse an argument. Return the argument that was parsed.
-   *
-   *     argument ::=
-   *         namedArgument
-   *       | expression
-   *
-   *     namedArgument ::=
-   *         label expression
-   */
-  Expression parseArgument() {
-    //
-    // Both namedArgument and expression can start with an identifier, but only
-    // namedArgument can have an identifier followed by a colon.
-    //
-    if (_matchesIdentifier() && _tokenMatches(_peek(), TokenType.COLON)) {
-      return new NamedExpression(parseLabel(), parseExpression2());
-    } else {
-      return parseExpression2();
-    }
-  }
-
-  /**
-   * Parse a list of arguments. Return the argument list that was parsed.
-   *
-   *     arguments ::=
-   *         '(' argumentList? ')'
-   *
-   *     argumentList ::=
-   *         namedArgument (',' namedArgument)*
-   *       | expressionList (',' namedArgument)*
-   */
-  ArgumentList parseArgumentList() {
-    Token leftParenthesis = _expect(TokenType.OPEN_PAREN);
-    List<Expression> arguments = new List<Expression>();
-    if (_matches(TokenType.CLOSE_PAREN)) {
-      return new ArgumentList(leftParenthesis, arguments, getAndAdvance());
-    }
-    //
-    // Even though unnamed arguments must all appear before any named arguments,
-    // we allow them to appear in any order so that we can recover faster.
-    //
-    bool wasInInitializer = _inInitializer;
-    _inInitializer = false;
-    try {
-      Expression argument = parseArgument();
-      arguments.add(argument);
-      bool foundNamedArgument = argument is NamedExpression;
-      bool generatedError = false;
-      while (_optional(TokenType.COMMA)) {
-        argument = parseArgument();
-        arguments.add(argument);
-        if (foundNamedArgument) {
-          bool blankArgument =
-              argument is SimpleIdentifier && argument.name.isEmpty;
-          if (!generatedError &&
-              !(argument is NamedExpression && !blankArgument)) {
-            // Report the error, once, but allow the arguments to be in any
-            // order in the AST.
-            _reportErrorForCurrentToken(
-                ParserErrorCode.POSITIONAL_AFTER_NAMED_ARGUMENT);
-            generatedError = true;
-          }
-        } else if (argument is NamedExpression) {
-          foundNamedArgument = true;
-        }
-      }
-      // TODO(brianwilkerson) Recovery: Look at the left parenthesis to see
-      // whether there is a matching right parenthesis. If there is, then we're
-      // more likely missing a comma and should go back to parsing arguments.
-      Token rightParenthesis = _expect(TokenType.CLOSE_PAREN);
-      return new ArgumentList(leftParenthesis, arguments, rightParenthesis);
-    } finally {
-      _inInitializer = wasInInitializer;
-    }
-  }
-
-  /**
-   * Parse a bitwise or expression. Return the bitwise or expression that was
-   * parsed.
-   *
-   *     bitwiseOrExpression ::=
-   *         bitwiseXorExpression ('|' bitwiseXorExpression)*
-   *       | 'super' ('|' bitwiseXorExpression)+
-   */
-  Expression parseBitwiseOrExpression() {
-    Expression expression;
-    if (_matchesKeyword(Keyword.SUPER) &&
-        _tokenMatches(_peek(), TokenType.BAR)) {
-      expression = new SuperExpression(getAndAdvance());
-    } else {
-      expression = _parseBitwiseXorExpression();
-    }
-    while (_matches(TokenType.BAR)) {
-      Token operator = getAndAdvance();
-      expression = new BinaryExpression(
-          expression, operator, _parseBitwiseXorExpression());
-    }
-    return expression;
-  }
-
-  /**
-   * Parse a block. Return the block that was parsed.
-   *
-   *     block ::=
-   *         '{' statements '}'
-   */
-  Block parseBlock() {
-    Token leftBracket = _expect(TokenType.OPEN_CURLY_BRACKET);
-    List<Statement> statements = new List<Statement>();
-    Token statementStart = _currentToken;
-    while (
-        !_matches(TokenType.EOF) && !_matches(TokenType.CLOSE_CURLY_BRACKET)) {
-      Statement statement = parseStatement2();
-      if (statement != null) {
-        statements.add(statement);
-      }
-      if (identical(_currentToken, statementStart)) {
-        // Ensure that we are making progress and report an error if we're not.
-        _reportErrorForToken(ParserErrorCode.UNEXPECTED_TOKEN, _currentToken,
-            [_currentToken.lexeme]);
-        _advance();
-      }
-      statementStart = _currentToken;
-    }
-    Token rightBracket = _expect(TokenType.CLOSE_CURLY_BRACKET);
-    return new Block(leftBracket, statements, rightBracket);
-  }
-
-  /**
-   * Parse a class member. The [className] is the name of the class containing
-   * the member being parsed. Return the class member that was parsed, or `null`
-   * if what was found was not a valid class member.
-   *
-   *     classMemberDefinition ::=
-   *         declaration ';'
-   *       | methodSignature functionBody
-   */
-  ClassMember parseClassMember(String className) {
-    CommentAndMetadata commentAndMetadata = _parseCommentAndMetadata();
-    Modifiers modifiers = _parseModifiers();
-    if (_matchesKeyword(Keyword.VOID)) {
-      TypeName returnType = parseReturnType();
-      if (_matchesKeyword(Keyword.GET) && _tokenMatchesIdentifier(_peek())) {
-        _validateModifiersForGetterOrSetterOrMethod(modifiers);
-        return _parseGetter(commentAndMetadata, modifiers.externalKeyword,
-            modifiers.staticKeyword, returnType);
-      } else if (_matchesKeyword(Keyword.SET) &&
-          _tokenMatchesIdentifier(_peek())) {
-        _validateModifiersForGetterOrSetterOrMethod(modifiers);
-        return _parseSetter(commentAndMetadata, modifiers.externalKeyword,
-            modifiers.staticKeyword, returnType);
-      } else if (_matchesKeyword(Keyword.OPERATOR) && _isOperator(_peek())) {
-        _validateModifiersForOperator(modifiers);
-        return _parseOperator(
-            commentAndMetadata, modifiers.externalKeyword, returnType);
-      } else if (_matchesIdentifier() &&
-          _peek().matchesAny([
-        TokenType.OPEN_PAREN,
-        TokenType.OPEN_CURLY_BRACKET,
-        TokenType.FUNCTION,
-        TokenType.LT
-      ])) {
-        _validateModifiersForGetterOrSetterOrMethod(modifiers);
-        return _parseMethodDeclarationAfterReturnType(commentAndMetadata,
-            modifiers.externalKeyword, modifiers.staticKeyword, returnType);
-      } else {
-        //
-        // We have found an error of some kind. Try to recover.
-        //
-        if (_matchesIdentifier()) {
-          if (_peek().matchesAny(
-              [TokenType.EQ, TokenType.COMMA, TokenType.SEMICOLON])) {
-            //
-            // We appear to have a variable declaration with a type of "void".
-            //
-            _reportErrorForNode(ParserErrorCode.VOID_VARIABLE, returnType);
-            return _parseInitializedIdentifierList(commentAndMetadata,
-                modifiers.staticKeyword, _validateModifiersForField(modifiers),
-                returnType);
-          }
-        }
-        if (_isOperator(_currentToken)) {
-          //
-          // We appear to have found an operator declaration without the
-          // 'operator' keyword.
-          //
-          _validateModifiersForOperator(modifiers);
-          return _parseOperator(
-              commentAndMetadata, modifiers.externalKeyword, returnType);
-        }
-        _reportErrorForToken(
-            ParserErrorCode.EXPECTED_EXECUTABLE, _currentToken);
-        return null;
-      }
-    } else if (_matchesKeyword(Keyword.GET) &&
-        _tokenMatchesIdentifier(_peek())) {
-      _validateModifiersForGetterOrSetterOrMethod(modifiers);
-      return _parseGetter(commentAndMetadata, modifiers.externalKeyword,
-          modifiers.staticKeyword, null);
-    } else if (_matchesKeyword(Keyword.SET) &&
-        _tokenMatchesIdentifier(_peek())) {
-      _validateModifiersForGetterOrSetterOrMethod(modifiers);
-      return _parseSetter(commentAndMetadata, modifiers.externalKeyword,
-          modifiers.staticKeyword, null);
-    } else if (_matchesKeyword(Keyword.OPERATOR) && _isOperator(_peek())) {
-      _validateModifiersForOperator(modifiers);
-      return _parseOperator(
-          commentAndMetadata, modifiers.externalKeyword, null);
-    } else if (!_matchesIdentifier()) {
-      //
-      // Recover from an error.
-      //
-      if (_matchesKeyword(Keyword.CLASS)) {
-        _reportErrorForCurrentToken(ParserErrorCode.CLASS_IN_CLASS);
-        // TODO(brianwilkerson) We don't currently have any way to capture the
-        // class that was parsed.
-        _parseClassDeclaration(commentAndMetadata, null);
-        return null;
-      } else if (_matchesKeyword(Keyword.ABSTRACT) &&
-          _tokenMatchesKeyword(_peek(), Keyword.CLASS)) {
-        _reportErrorForToken(ParserErrorCode.CLASS_IN_CLASS, _peek());
-        // TODO(brianwilkerson) We don't currently have any way to capture the
-        // class that was parsed.
-        _parseClassDeclaration(commentAndMetadata, getAndAdvance());
-        return null;
-      } else if (_matchesKeyword(Keyword.ENUM)) {
-        _reportErrorForToken(ParserErrorCode.ENUM_IN_CLASS, _peek());
-        // TODO(brianwilkerson) We don't currently have any way to capture the
-        // enum that was parsed.
-        _parseEnumDeclaration(commentAndMetadata);
-        return null;
-      } else if (_isOperator(_currentToken)) {
-        //
-        // We appear to have found an operator declaration without the
-        // 'operator' keyword.
-        //
-        _validateModifiersForOperator(modifiers);
-        return _parseOperator(
-            commentAndMetadata, modifiers.externalKeyword, null);
-      }
-      Token keyword = modifiers.varKeyword;
-      if (keyword == null) {
-        keyword = modifiers.finalKeyword;
-      }
-      if (keyword == null) {
-        keyword = modifiers.constKeyword;
-      }
-      if (keyword != null) {
-        //
-        // We appear to have found an incomplete field declaration.
-        //
-        _reportErrorForCurrentToken(ParserErrorCode.MISSING_IDENTIFIER);
-        List<VariableDeclaration> variables = new List<VariableDeclaration>();
-        variables.add(
-            new VariableDeclaration(_createSyntheticIdentifier(), null, null));
-        return new FieldDeclaration(commentAndMetadata.comment,
-            commentAndMetadata.metadata, null,
-            new VariableDeclarationList(null, null, keyword, null, variables),
-            _expectSemicolon());
-      }
-      _reportErrorForToken(
-          ParserErrorCode.EXPECTED_CLASS_MEMBER, _currentToken);
-      if (commentAndMetadata.comment != null ||
-          !commentAndMetadata.metadata.isEmpty) {
-        //
-        // We appear to have found an incomplete declaration at the end of the
-        // class. At this point it consists of a metadata, which we don't want
-        // to loose, so we'll treat it as a method declaration with a missing
-        // name, parameters and empty body.
-        //
-        return new MethodDeclaration(commentAndMetadata.comment,
-            commentAndMetadata.metadata, null, null, null, null, null,
-            _createSyntheticIdentifier(), null, new FormalParameterList(
-                null, new List<FormalParameter>(), null, null, null),
-            new EmptyFunctionBody(_createSyntheticToken(TokenType.SEMICOLON)));
-      }
-      return null;
-    } else if (_tokenMatches(_peek(), TokenType.PERIOD) &&
-        _tokenMatchesIdentifier(_peekAt(2)) &&
-        _tokenMatches(_peekAt(3), TokenType.OPEN_PAREN)) {
-      return _parseConstructor(commentAndMetadata, modifiers.externalKeyword,
-          _validateModifiersForConstructor(modifiers), modifiers.factoryKeyword,
-          parseSimpleIdentifier(), getAndAdvance(), parseSimpleIdentifier(),
-          parseFormalParameterList());
-    } else if (_tokenMatches(_peek(), TokenType.OPEN_PAREN)) {
-      SimpleIdentifier methodName = parseSimpleIdentifier();
-      FormalParameterList parameters = parseFormalParameterList();
-      if (_matches(TokenType.COLON) ||
-          modifiers.factoryKeyword != null ||
-          methodName.name == className) {
-        return _parseConstructor(commentAndMetadata, modifiers.externalKeyword,
-            _validateModifiersForConstructor(modifiers),
-            modifiers.factoryKeyword, methodName, null, null, parameters);
-      }
-      _validateModifiersForGetterOrSetterOrMethod(modifiers);
-      _validateFormalParameterList(parameters);
-      return _parseMethodDeclarationAfterParameters(commentAndMetadata,
-          modifiers.externalKeyword, modifiers.staticKeyword, null, methodName,
-          null, parameters);
-    } else if (_peek()
-        .matchesAny([TokenType.EQ, TokenType.COMMA, TokenType.SEMICOLON])) {
-      if (modifiers.constKeyword == null &&
-          modifiers.finalKeyword == null &&
-          modifiers.varKeyword == null) {
-        _reportErrorForCurrentToken(
-            ParserErrorCode.MISSING_CONST_FINAL_VAR_OR_TYPE);
-      }
-      return _parseInitializedIdentifierList(commentAndMetadata,
-          modifiers.staticKeyword, _validateModifiersForField(modifiers), null);
-    } else if (_matchesKeyword(Keyword.TYPEDEF)) {
-      _reportErrorForCurrentToken(ParserErrorCode.TYPEDEF_IN_CLASS);
-      // TODO(brianwilkerson) We don't currently have any way to capture the
-      // function type alias that was parsed.
-      _parseFunctionTypeAlias(commentAndMetadata, getAndAdvance());
-      return null;
-    } else if (parseGenericMethods) {
-      Token token = _skipTypeParameterList(_peek());
-      if (token != null && _tokenMatches(token, TokenType.OPEN_PAREN)) {
-        return _parseMethodDeclarationAfterReturnType(commentAndMetadata,
-            modifiers.externalKeyword, modifiers.staticKeyword, null);
-      }
-    }
-    TypeName type = parseTypeName();
-    if (_matchesKeyword(Keyword.GET) && _tokenMatchesIdentifier(_peek())) {
-      _validateModifiersForGetterOrSetterOrMethod(modifiers);
-      return _parseGetter(commentAndMetadata, modifiers.externalKeyword,
-          modifiers.staticKeyword, type);
-    } else if (_matchesKeyword(Keyword.SET) &&
-        _tokenMatchesIdentifier(_peek())) {
-      _validateModifiersForGetterOrSetterOrMethod(modifiers);
-      return _parseSetter(commentAndMetadata, modifiers.externalKeyword,
-          modifiers.staticKeyword, type);
-    } else if (_matchesKeyword(Keyword.OPERATOR) && _isOperator(_peek())) {
-      _validateModifiersForOperator(modifiers);
-      return _parseOperator(
-          commentAndMetadata, modifiers.externalKeyword, type);
-    } else if (!_matchesIdentifier()) {
-      if (_matches(TokenType.CLOSE_CURLY_BRACKET)) {
-        //
-        // We appear to have found an incomplete declaration at the end of the
-        // class. At this point it consists of a type name, so we'll treat it as
-        // a field declaration with a missing field name and semicolon.
-        //
-        return _parseInitializedIdentifierList(commentAndMetadata,
-            modifiers.staticKeyword, _validateModifiersForField(modifiers),
-            type);
-      }
-      if (_isOperator(_currentToken)) {
-        //
-        // We appear to have found an operator declaration without the
-        // 'operator' keyword.
-        //
-        _validateModifiersForOperator(modifiers);
-        return _parseOperator(
-            commentAndMetadata, modifiers.externalKeyword, type);
-      }
-      //
-      // We appear to have found an incomplete declaration before another
-      // declaration. At this point it consists of a type name, so we'll treat
-      // it as a field declaration with a missing field name and semicolon.
-      //
-      _reportErrorForToken(
-          ParserErrorCode.EXPECTED_CLASS_MEMBER, _currentToken);
-      try {
-        _lockErrorListener();
-        return _parseInitializedIdentifierList(commentAndMetadata,
-            modifiers.staticKeyword, _validateModifiersForField(modifiers),
-            type);
-      } finally {
-        _unlockErrorListener();
-      }
-    } else if (_tokenMatches(_peek(), TokenType.OPEN_PAREN)) {
-      SimpleIdentifier methodName = parseSimpleIdentifier();
-      FormalParameterList parameters = parseFormalParameterList();
-      if (methodName.name == className) {
-        _reportErrorForNode(ParserErrorCode.CONSTRUCTOR_WITH_RETURN_TYPE, type);
-        return _parseConstructor(commentAndMetadata, modifiers.externalKeyword,
-            _validateModifiersForConstructor(modifiers),
-            modifiers.factoryKeyword, methodName, null, null, parameters);
-      }
-      _validateModifiersForGetterOrSetterOrMethod(modifiers);
-      _validateFormalParameterList(parameters);
-      return _parseMethodDeclarationAfterParameters(commentAndMetadata,
-          modifiers.externalKeyword, modifiers.staticKeyword, type, methodName,
-          null, parameters);
-    } else if (parseGenericMethods && _tokenMatches(_peek(), TokenType.LT)) {
-      return _parseMethodDeclarationAfterReturnType(commentAndMetadata,
-          modifiers.externalKeyword, modifiers.staticKeyword, type);
-    } else if (_tokenMatches(_peek(), TokenType.OPEN_CURLY_BRACKET)) {
-      // We have found "TypeName identifier {", and are guessing that this is a
-      // getter without the keyword 'get'.
-      _validateModifiersForGetterOrSetterOrMethod(modifiers);
-      _reportErrorForCurrentToken(ParserErrorCode.MISSING_GET);
-      _currentToken = _injectToken(
-          new Parser_SyntheticKeywordToken(Keyword.GET, _currentToken.offset));
-      return _parseGetter(commentAndMetadata, modifiers.externalKeyword,
-          modifiers.staticKeyword, type);
-    }
-    return _parseInitializedIdentifierList(commentAndMetadata,
-        modifiers.staticKeyword, _validateModifiersForField(modifiers), type);
-  }
-
-  /**
-   * Parse a single combinator. Return the combinator that was parsed, or `null`
-   * if no combinator is found.
-   *
-   *     combinator ::=
-   *         'show' identifier (',' identifier)*
-   *       | 'hide' identifier (',' identifier)*
-   */
-  Combinator parseCombinator() {
-    if (_matchesString(_SHOW) || _matchesString(_HIDE)) {
-      Token keyword = getAndAdvance();
-      List<SimpleIdentifier> names = _parseIdentifierList();
-      if (keyword.lexeme == _SHOW) {
-        return new ShowCombinator(keyword, names);
-      } else {
-        return new HideCombinator(keyword, names);
-      }
-    }
-    return null;
-  }
-
-  /**
-   * Parse a compilation unit, starting with the given [token]. Return the
-   * compilation unit that was parsed.
-   */
-  CompilationUnit parseCompilationUnit(Token token) {
-    _currentToken = token;
-    return parseCompilationUnit2();
-  }
-
-  /**
-   * Parse a compilation unit. Return the compilation unit that was parsed.
-   *
-   * Specified:
-   *
-   *     compilationUnit ::=
-   *         scriptTag? directive* topLevelDeclaration*
-   *
-   * Actual:
-   *
-   *     compilationUnit ::=
-   *         scriptTag? topLevelElement*
-   *
-   *     topLevelElement ::=
-   *         directive
-   *       | topLevelDeclaration
-   */
-  CompilationUnit parseCompilationUnit2() {
-    Token firstToken = _currentToken;
-    ScriptTag scriptTag = null;
-    if (_matches(TokenType.SCRIPT_TAG)) {
-      scriptTag = new ScriptTag(getAndAdvance());
-    }
-    //
-    // Even though all directives must appear before declarations and must occur
-    // in a given order, we allow directives and declarations to occur in any
-    // order so that we can recover better.
-    //
-    bool libraryDirectiveFound = false;
-    bool partOfDirectiveFound = false;
-    bool partDirectiveFound = false;
-    bool directiveFoundAfterDeclaration = false;
-    List<Directive> directives = new List<Directive>();
-    List<CompilationUnitMember> declarations =
-        new List<CompilationUnitMember>();
-    Token memberStart = _currentToken;
-    while (!_matches(TokenType.EOF)) {
-      CommentAndMetadata commentAndMetadata = _parseCommentAndMetadata();
-      if ((_matchesKeyword(Keyword.IMPORT) ||
-              _matchesKeyword(Keyword.EXPORT) ||
-              _matchesKeyword(Keyword.LIBRARY) ||
-              _matchesKeyword(Keyword.PART)) &&
-          !_tokenMatches(_peek(), TokenType.PERIOD) &&
-          !_tokenMatches(_peek(), TokenType.LT) &&
-          !_tokenMatches(_peek(), TokenType.OPEN_PAREN)) {
-        Directive directive = _parseDirective(commentAndMetadata);
-        if (declarations.length > 0 && !directiveFoundAfterDeclaration) {
-          _reportErrorForToken(ParserErrorCode.DIRECTIVE_AFTER_DECLARATION,
-              directive.beginToken);
-          directiveFoundAfterDeclaration = true;
-        }
-        if (directive is LibraryDirective) {
-          if (libraryDirectiveFound) {
-            _reportErrorForCurrentToken(
-                ParserErrorCode.MULTIPLE_LIBRARY_DIRECTIVES);
-          } else {
-            if (directives.length > 0) {
-              _reportErrorForToken(ParserErrorCode.LIBRARY_DIRECTIVE_NOT_FIRST,
-                  directive.libraryKeyword);
-            }
-            libraryDirectiveFound = true;
-          }
-        } else if (directive is PartDirective) {
-          partDirectiveFound = true;
-        } else if (partDirectiveFound) {
-          if (directive is ExportDirective) {
-            _reportErrorForToken(
-                ParserErrorCode.EXPORT_DIRECTIVE_AFTER_PART_DIRECTIVE,
-                directive.keyword);
-          } else if (directive is ImportDirective) {
-            _reportErrorForToken(
-                ParserErrorCode.IMPORT_DIRECTIVE_AFTER_PART_DIRECTIVE,
-                directive.keyword);
-          }
-        }
-        if (directive is PartOfDirective) {
-          if (partOfDirectiveFound) {
-            _reportErrorForCurrentToken(
-                ParserErrorCode.MULTIPLE_PART_OF_DIRECTIVES);
-          } else {
-            int directiveCount = directives.length;
-            for (int i = 0; i < directiveCount; i++) {
-              _reportErrorForToken(
-                  ParserErrorCode.NON_PART_OF_DIRECTIVE_IN_PART,
-                  directives[i].keyword);
-            }
-            partOfDirectiveFound = true;
-          }
-        } else {
-          if (partOfDirectiveFound) {
-            _reportErrorForToken(ParserErrorCode.NON_PART_OF_DIRECTIVE_IN_PART,
-                directive.keyword);
-          }
-        }
-        directives.add(directive);
-      } else if (_matches(TokenType.SEMICOLON)) {
-        _reportErrorForToken(ParserErrorCode.UNEXPECTED_TOKEN, _currentToken,
-            [_currentToken.lexeme]);
-        _advance();
-      } else {
-        CompilationUnitMember member =
-            _parseCompilationUnitMember(commentAndMetadata);
-        if (member != null) {
-          declarations.add(member);
-        }
-      }
-      if (identical(_currentToken, memberStart)) {
-        _reportErrorForToken(ParserErrorCode.UNEXPECTED_TOKEN, _currentToken,
-            [_currentToken.lexeme]);
-        _advance();
-        while (!_matches(TokenType.EOF) &&
-            !_couldBeStartOfCompilationUnitMember()) {
-          _advance();
-        }
-      }
-      memberStart = _currentToken;
-    }
-    return new CompilationUnit(
-        firstToken, scriptTag, directives, declarations, _currentToken);
-  }
-
-  /**
-   * Parse a conditional expression. Return the conditional expression that was
-   * parsed.
-   *
-   *     conditionalExpression ::=
-   *         ifNullExpression ('?' expressionWithoutCascade ':' expressionWithoutCascade)?
-   */
-  Expression parseConditionalExpression() {
-    Expression condition = parseIfNullExpression();
-    if (!_matches(TokenType.QUESTION)) {
-      return condition;
-    }
-    Token question = getAndAdvance();
-    Expression thenExpression = parseExpressionWithoutCascade();
-    Token colon = _expect(TokenType.COLON);
-    Expression elseExpression = parseExpressionWithoutCascade();
-    return new ConditionalExpression(
-        condition, question, thenExpression, colon, elseExpression);
-  }
-
-  /**
-   * Parse the name of a constructor. Return the constructor name that was
-   * parsed.
-   *
-   *     constructorName:
-   *         type ('.' identifier)?
-   */
-  ConstructorName parseConstructorName() {
-    TypeName type = parseTypeName();
-    Token period = null;
-    SimpleIdentifier name = null;
-    if (_matches(TokenType.PERIOD)) {
-      period = getAndAdvance();
-      name = parseSimpleIdentifier();
-    }
-    return new ConstructorName(type, period, name);
-  }
-
-  /**
-   * Parse the script tag and directives in a compilation unit, starting with
-   * the given [token], until the first non-directive is encountered. The
-   * remainder of the compilation unit will not be parsed. Specifically, if
-   * there are directives later in the file, they will not be parsed. Return the
-   * compilation unit that was parsed.
-   */
-  CompilationUnit parseDirectives(Token token) {
-    _currentToken = token;
-    return _parseDirectives();
-  }
-
-  /**
-   * Parse an expression, starting with the given [token]. Return the expression
-   * that was parsed, or `null` if the tokens do not represent a recognizable
-   * expression.
-   */
-  Expression parseExpression(Token token) {
-    _currentToken = token;
-    return parseExpression2();
-  }
-
-  /**
-   * Parse an expression that might contain a cascade. Return the expression
-   * that was parsed.
-   *
-   *     expression ::=
-   *         assignableExpression assignmentOperator expression
-   *       | conditionalExpression cascadeSection*
-   *       | throwExpression
-   */
-  Expression parseExpression2() {
-    if (_matchesKeyword(Keyword.THROW)) {
-      return _parseThrowExpression();
-    } else if (_matchesKeyword(Keyword.RETHROW)) {
-      // TODO(brianwilkerson) Rethrow is a statement again.
-      return _parseRethrowExpression();
-    }
-    //
-    // assignableExpression is a subset of conditionalExpression, so we can
-    // parse a conditional expression and then determine whether it is followed
-    // by an assignmentOperator, checking for conformance to the restricted
-    // grammar after making that determination.
-    //
-    Expression expression = parseConditionalExpression();
-    TokenType tokenType = _currentToken.type;
-    if (tokenType == TokenType.PERIOD_PERIOD) {
-      List<Expression> cascadeSections = new List<Expression>();
-      while (tokenType == TokenType.PERIOD_PERIOD) {
-        Expression section = _parseCascadeSection();
-        if (section != null) {
-          cascadeSections.add(section);
-        }
-        tokenType = _currentToken.type;
-      }
-      return new CascadeExpression(expression, cascadeSections);
-    } else if (tokenType.isAssignmentOperator) {
-      Token operator = getAndAdvance();
-      _ensureAssignable(expression);
-      return new AssignmentExpression(expression, operator, parseExpression2());
-    }
-    return expression;
-  }
-
-  /**
-   * Parse an expression that does not contain any cascades. Return the
-   * expression that was parsed.
-   *
-   *     expressionWithoutCascade ::=
-   *         assignableExpression assignmentOperator expressionWithoutCascade
-   *       | conditionalExpression
-   *       | throwExpressionWithoutCascade
-   */
-  Expression parseExpressionWithoutCascade() {
-    if (_matchesKeyword(Keyword.THROW)) {
-      return _parseThrowExpressionWithoutCascade();
-    } else if (_matchesKeyword(Keyword.RETHROW)) {
-      return _parseRethrowExpression();
-    }
-    //
-    // assignableExpression is a subset of conditionalExpression, so we can
-    // parse a conditional expression and then determine whether it is followed
-    // by an assignmentOperator, checking for conformance to the restricted
-    // grammar after making that determination.
-    //
-    Expression expression = parseConditionalExpression();
-    if (_currentToken.type.isAssignmentOperator) {
-      Token operator = getAndAdvance();
-      _ensureAssignable(expression);
-      expression = new AssignmentExpression(
-          expression, operator, parseExpressionWithoutCascade());
-    }
-    return expression;
-  }
-
-  /**
-   * Parse a class extends clause. Return the class extends clause that was
-   * parsed.
-   *
-   *     classExtendsClause ::=
-   *         'extends' type
-   */
-  ExtendsClause parseExtendsClause() {
-    Token keyword = _expectKeyword(Keyword.EXTENDS);
-    TypeName superclass = parseTypeName();
-    return new ExtendsClause(keyword, superclass);
-  }
-
-  /**
-   * Parse a list of formal parameters. Return the formal parameters that were
-   * parsed.
-   *
-   *     formalParameterList ::=
-   *         '(' ')'
-   *       | '(' normalFormalParameters (',' optionalFormalParameters)? ')'
-   *       | '(' optionalFormalParameters ')'
-   *
-   *     normalFormalParameters ::=
-   *         normalFormalParameter (',' normalFormalParameter)*
-   *
-   *     optionalFormalParameters ::=
-   *         optionalPositionalFormalParameters
-   *       | namedFormalParameters
-   *
-   *     optionalPositionalFormalParameters ::=
-   *         '[' defaultFormalParameter (',' defaultFormalParameter)* ']'
-   *
-   *     namedFormalParameters ::=
-   *         '{' defaultNamedParameter (',' defaultNamedParameter)* '}'
-   */
-  FormalParameterList parseFormalParameterList() {
-    Token leftParenthesis = _expect(TokenType.OPEN_PAREN);
-    if (_matches(TokenType.CLOSE_PAREN)) {
-      return new FormalParameterList(
-          leftParenthesis, null, null, null, getAndAdvance());
-    }
-    //
-    // Even though it is invalid to have default parameters outside of brackets,
-    // required parameters inside of brackets, or multiple groups of default and
-    // named parameters, we allow all of these cases so that we can recover
-    // better.
-    //
-    List<FormalParameter> parameters = new List<FormalParameter>();
-    List<FormalParameter> normalParameters = new List<FormalParameter>();
-    List<FormalParameter> positionalParameters = new List<FormalParameter>();
-    List<FormalParameter> namedParameters = new List<FormalParameter>();
-    List<FormalParameter> currentParameters = normalParameters;
-    Token leftSquareBracket = null;
-    Token rightSquareBracket = null;
-    Token leftCurlyBracket = null;
-    Token rightCurlyBracket = null;
-    ParameterKind kind = ParameterKind.REQUIRED;
-    bool firstParameter = true;
-    bool reportedMuliplePositionalGroups = false;
-    bool reportedMulipleNamedGroups = false;
-    bool reportedMixedGroups = false;
-    bool wasOptionalParameter = false;
-    Token initialToken = null;
-    do {
-      if (firstParameter) {
-        firstParameter = false;
-      } else if (!_optional(TokenType.COMMA)) {
-        // TODO(brianwilkerson) The token is wrong, we need to recover from this
-        // case.
-        if (_getEndToken(leftParenthesis) != null) {
-          _reportErrorForCurrentToken(
-              ParserErrorCode.EXPECTED_TOKEN, [TokenType.COMMA.lexeme]);
-        } else {
-          _reportErrorForToken(ParserErrorCode.MISSING_CLOSING_PARENTHESIS,
-              _currentToken.previous);
-          break;
-        }
-      }
-      initialToken = _currentToken;
-      //
-      // Handle the beginning of parameter groups.
-      //
-      if (_matches(TokenType.OPEN_SQUARE_BRACKET)) {
-        wasOptionalParameter = true;
-        if (leftSquareBracket != null && !reportedMuliplePositionalGroups) {
-          _reportErrorForCurrentToken(
-              ParserErrorCode.MULTIPLE_POSITIONAL_PARAMETER_GROUPS);
-          reportedMuliplePositionalGroups = true;
-        }
-        if (leftCurlyBracket != null && !reportedMixedGroups) {
-          _reportErrorForCurrentToken(ParserErrorCode.MIXED_PARAMETER_GROUPS);
-          reportedMixedGroups = true;
-        }
-        leftSquareBracket = getAndAdvance();
-        currentParameters = positionalParameters;
-        kind = ParameterKind.POSITIONAL;
-      } else if (_matches(TokenType.OPEN_CURLY_BRACKET)) {
-        wasOptionalParameter = true;
-        if (leftCurlyBracket != null && !reportedMulipleNamedGroups) {
-          _reportErrorForCurrentToken(
-              ParserErrorCode.MULTIPLE_NAMED_PARAMETER_GROUPS);
-          reportedMulipleNamedGroups = true;
-        }
-        if (leftSquareBracket != null && !reportedMixedGroups) {
-          _reportErrorForCurrentToken(ParserErrorCode.MIXED_PARAMETER_GROUPS);
-          reportedMixedGroups = true;
-        }
-        leftCurlyBracket = getAndAdvance();
-        currentParameters = namedParameters;
-        kind = ParameterKind.NAMED;
-      }
-      //
-      // Parse and record the parameter.
-      //
-      FormalParameter parameter = _parseFormalParameter(kind);
-      parameters.add(parameter);
-      currentParameters.add(parameter);
-      if (kind == ParameterKind.REQUIRED && wasOptionalParameter) {
-        _reportErrorForNode(
-            ParserErrorCode.NORMAL_BEFORE_OPTIONAL_PARAMETERS, parameter);
-      }
-      //
-      // Handle the end of parameter groups.
-      //
-      // TODO(brianwilkerson) Improve the detection and reporting of missing and
-      // mismatched delimiters.
-      if (_matches(TokenType.CLOSE_SQUARE_BRACKET)) {
-        rightSquareBracket = getAndAdvance();
-        currentParameters = normalParameters;
-        if (leftSquareBracket == null) {
-          if (leftCurlyBracket != null) {
-            _reportErrorForCurrentToken(
-                ParserErrorCode.WRONG_TERMINATOR_FOR_PARAMETER_GROUP, ["}"]);
-            rightCurlyBracket = rightSquareBracket;
-            rightSquareBracket = null;
-          } else {
-            _reportErrorForCurrentToken(
-                ParserErrorCode.UNEXPECTED_TERMINATOR_FOR_PARAMETER_GROUP,
-                ["["]);
-          }
-        }
-        kind = ParameterKind.REQUIRED;
-      } else if (_matches(TokenType.CLOSE_CURLY_BRACKET)) {
-        rightCurlyBracket = getAndAdvance();
-        currentParameters = normalParameters;
-        if (leftCurlyBracket == null) {
-          if (leftSquareBracket != null) {
-            _reportErrorForCurrentToken(
-                ParserErrorCode.WRONG_TERMINATOR_FOR_PARAMETER_GROUP, ["]"]);
-            rightSquareBracket = rightCurlyBracket;
-            rightCurlyBracket = null;
-          } else {
-            _reportErrorForCurrentToken(
-                ParserErrorCode.UNEXPECTED_TERMINATOR_FOR_PARAMETER_GROUP,
-                ["{"]);
-          }
-        }
-        kind = ParameterKind.REQUIRED;
-      }
-    } while (!_matches(TokenType.CLOSE_PAREN) &&
-        !identical(initialToken, _currentToken));
-    Token rightParenthesis = _expect(TokenType.CLOSE_PAREN);
-    //
-    // Check that the groups were closed correctly.
-    //
-    if (leftSquareBracket != null && rightSquareBracket == null) {
-      _reportErrorForCurrentToken(
-          ParserErrorCode.MISSING_TERMINATOR_FOR_PARAMETER_GROUP, ["]"]);
-    }
-    if (leftCurlyBracket != null && rightCurlyBracket == null) {
-      _reportErrorForCurrentToken(
-          ParserErrorCode.MISSING_TERMINATOR_FOR_PARAMETER_GROUP, ["}"]);
-    }
-    //
-    // Build the parameter list.
-    //
-    if (leftSquareBracket == null) {
-      leftSquareBracket = leftCurlyBracket;
-    }
-    if (rightSquareBracket == null) {
-      rightSquareBracket = rightCurlyBracket;
-    }
-    return new FormalParameterList(leftParenthesis, parameters,
-        leftSquareBracket, rightSquareBracket, rightParenthesis);
-  }
-
-  /**
-   * Parse a function expression. Return the function expression that was
-   * parsed.
-   *
-   *     functionExpression ::=
-   *         typeParameters? formalParameterList functionExpressionBody
-   */
-  FunctionExpression parseFunctionExpression() {
-    TypeParameterList typeParameters = null;
-    if (parseGenericMethods && _matches(TokenType.LT)) {
-      typeParameters = parseTypeParameterList();
-    }
-    FormalParameterList parameters = parseFormalParameterList();
-    _validateFormalParameterList(parameters);
-    FunctionBody body =
-        _parseFunctionBody(false, ParserErrorCode.MISSING_FUNCTION_BODY, true);
-    return new FunctionExpression(typeParameters, parameters, body);
-  }
-
-  /**
-   * Parse an if-null expression.  Return the if-null expression that was
-   * parsed.
-   *
-   *     ifNullExpression ::= logicalOrExpression ('??' logicalOrExpression)*
-   */
-  Expression parseIfNullExpression() {
-    Expression expression = parseLogicalOrExpression();
-    while (_matches(TokenType.QUESTION_QUESTION)) {
-      Token operator = getAndAdvance();
-      expression = new BinaryExpression(
-          expression, operator, parseLogicalOrExpression());
-    }
-    return expression;
-  }
-
-  /**
-   * Parse an implements clause. Return the implements clause that was parsed.
-   *
-   *     implementsClause ::=
-   *         'implements' type (',' type)*
-   */
-  ImplementsClause parseImplementsClause() {
-    Token keyword = _expectKeyword(Keyword.IMPLEMENTS);
-    List<TypeName> interfaces = new List<TypeName>();
-    interfaces.add(parseTypeName());
-    while (_optional(TokenType.COMMA)) {
-      interfaces.add(parseTypeName());
-    }
-    return new ImplementsClause(keyword, interfaces);
-  }
-
-  /**
-   * Parse a label. Return the label that was parsed.
-   *
-   *     label ::=
-   *         identifier ':'
-   */
-  Label parseLabel() {
-    SimpleIdentifier label = parseSimpleIdentifier();
-    Token colon = _expect(TokenType.COLON);
-    return new Label(label, colon);
-  }
-
-  /**
-   * Parse a library identifier. Return the library identifier that was parsed.
-   *
-   *     libraryIdentifier ::=
-   *         identifier ('.' identifier)*
-   */
-  LibraryIdentifier parseLibraryIdentifier() {
-    List<SimpleIdentifier> components = new List<SimpleIdentifier>();
-    components.add(parseSimpleIdentifier());
-    while (_matches(TokenType.PERIOD)) {
-      _advance();
-      components.add(parseSimpleIdentifier());
-    }
-    return new LibraryIdentifier(components);
-  }
-
-  /**
-   * Parse a logical or expression. Return the logical or expression that was
-   * parsed.
-   *
-   *     logicalOrExpression ::=
-   *         logicalAndExpression ('||' logicalAndExpression)*
-   */
-  Expression parseLogicalOrExpression() {
-    Expression expression = _parseLogicalAndExpression();
-    while (_matches(TokenType.BAR_BAR)) {
-      Token operator = getAndAdvance();
-      expression = new BinaryExpression(
-          expression, operator, _parseLogicalAndExpression());
-    }
-    return expression;
-  }
-
-  /**
-   * Parse a map literal entry. Return the map literal entry that was parsed.
-   *
-   *     mapLiteralEntry ::=
-   *         expression ':' expression
-   */
-  MapLiteralEntry parseMapLiteralEntry() {
-    Expression key = parseExpression2();
-    Token separator = _expect(TokenType.COLON);
-    Expression value = parseExpression2();
-    return new MapLiteralEntry(key, separator, value);
-  }
-
-  /**
-   * Parse a normal formal parameter. Return the normal formal parameter that
-   * was parsed.
-   *
-   *     normalFormalParameter ::=
-   *         functionSignature
-   *       | fieldFormalParameter
-   *       | simpleFormalParameter
-   *
-   *     functionSignature:
-   *         metadata returnType? identifier typeParameters? formalParameterList
-   *
-   *     fieldFormalParameter ::=
-   *         metadata finalConstVarOrType? 'this' '.' identifier
-   *
-   *     simpleFormalParameter ::=
-   *         declaredIdentifier
-   *       | metadata identifier
-   */
-  NormalFormalParameter parseNormalFormalParameter() {
-    CommentAndMetadata commentAndMetadata = _parseCommentAndMetadata();
-    FinalConstVarOrType holder = _parseFinalConstVarOrType(true);
-    Token thisKeyword = null;
-    Token period = null;
-    if (_matchesKeyword(Keyword.THIS)) {
-      thisKeyword = getAndAdvance();
-      period = _expect(TokenType.PERIOD);
-    }
-    SimpleIdentifier identifier = parseSimpleIdentifier();
-    TypeParameterList typeParameters = null;
-    if (parseGenericMethods && _matches(TokenType.LT)) {
-      typeParameters = parseTypeParameterList();
-    }
-    if (_matches(TokenType.OPEN_PAREN)) {
-      FormalParameterList parameters = parseFormalParameterList();
-      if (thisKeyword == null) {
-        if (holder.keyword != null) {
-          _reportErrorForToken(
-              ParserErrorCode.FUNCTION_TYPED_PARAMETER_VAR, holder.keyword);
-        }
-        return new FunctionTypedFormalParameter(commentAndMetadata.comment,
-            commentAndMetadata.metadata, holder.type, identifier,
-            typeParameters, parameters);
-      } else {
-        return new FieldFormalParameter(commentAndMetadata.comment,
-            commentAndMetadata.metadata, holder.keyword, holder.type,
-            thisKeyword, period, identifier, typeParameters, parameters);
-      }
-    } else if (typeParameters != null) {
-      // TODO(brianwilkerson) Report an error. It looks like a function-typed
-      // parameter with no parameter list.
-      //_reportErrorForToken(ParserErrorCode.MISSING_PARAMETERS, typeParameters.endToken);
-    }
-    TypeName type = holder.type;
-    if (type != null) {
-      if (_tokenMatchesKeyword(type.name.beginToken, Keyword.VOID)) {
-        _reportErrorForToken(
-            ParserErrorCode.VOID_PARAMETER, type.name.beginToken);
-      } else if (holder.keyword != null &&
-          _tokenMatchesKeyword(holder.keyword, Keyword.VAR)) {
-        _reportErrorForToken(ParserErrorCode.VAR_AND_TYPE, holder.keyword);
-      }
-    }
-    if (thisKeyword != null) {
-      // TODO(brianwilkerson) If there are type parameters but no parameters,
-      // should we create a synthetic empty parameter list here so we can
-      // capture the type parameters?
-      return new FieldFormalParameter(commentAndMetadata.comment,
-          commentAndMetadata.metadata, holder.keyword, holder.type, thisKeyword,
-          period, identifier, null, null);
-    }
-    return new SimpleFormalParameter(commentAndMetadata.comment,
-        commentAndMetadata.metadata, holder.keyword, holder.type, identifier);
-  }
-
-  /**
-   * Parse a prefixed identifier. Return the prefixed identifier that was
-   * parsed.
-   *
-   *     prefixedIdentifier ::=
-   *         identifier ('.' identifier)?
-   */
-  Identifier parsePrefixedIdentifier() {
-    SimpleIdentifier qualifier = parseSimpleIdentifier();
-    if (!_matches(TokenType.PERIOD)) {
-      return qualifier;
-    }
-    Token period = getAndAdvance();
-    SimpleIdentifier qualified = parseSimpleIdentifier();
-    return new PrefixedIdentifier(qualifier, period, qualified);
-  }
-
-  /**
-   * Parse a return type. Return the return type that was parsed.
-   *
-   *     returnType ::=
-   *         'void'
-   *       | type
-   */
-  TypeName parseReturnType() {
-    if (_matchesKeyword(Keyword.VOID)) {
-      return new TypeName(new SimpleIdentifier(getAndAdvance()), null);
-    } else {
-      return parseTypeName();
-    }
-  }
-
-  /**
-   * Parse a simple identifier. Return the simple identifier that was parsed.
-   *
-   *     identifier ::=
-   *         IDENTIFIER
-   */
-  SimpleIdentifier parseSimpleIdentifier() {
-    if (_matchesIdentifier()) {
-      String lexeme = _currentToken.lexeme;
-      if ((_inAsync || _inGenerator) &&
-          (lexeme == 'async' || lexeme == 'await' || lexeme == 'yield')) {
-        _reportErrorForCurrentToken(
-            ParserErrorCode.ASYNC_KEYWORD_USED_AS_IDENTIFIER);
-      }
-      return new SimpleIdentifier(getAndAdvance());
-    }
-    _reportErrorForCurrentToken(ParserErrorCode.MISSING_IDENTIFIER);
-    return _createSyntheticIdentifier();
-  }
-
-  /**
-   * Parse a statement, starting with the given [token]. Return the statement
-   * that was parsed, or `null` if the tokens do not represent a recognizable
-   * statement.
-   */
-  Statement parseStatement(Token token) {
-    _currentToken = token;
-    return parseStatement2();
-  }
-
-  /**
-   * Parse a statement. Return the statement that was parsed.
-   *
-   *     statement ::=
-   *         label* nonLabeledStatement
-   */
-  Statement parseStatement2() {
-    List<Label> labels = new List<Label>();
-    while (_matchesIdentifier() && _tokenMatches(_peek(), TokenType.COLON)) {
-      labels.add(parseLabel());
-    }
-    Statement statement = _parseNonLabeledStatement();
-    if (labels.isEmpty) {
-      return statement;
-    }
-    return new LabeledStatement(labels, statement);
-  }
-
-  /**
-   * Parse a sequence of statements, starting with the given [token]. Return the
-   * statements that were parsed, or `null` if the tokens do not represent a
-   * recognizable sequence of statements.
-   */
-  List<Statement> parseStatements(Token token) {
-    _currentToken = token;
-    return _parseStatementList();
-  }
-
-  /**
-   * Parse a string literal. Return the string literal that was parsed.
-   *
-   *     stringLiteral ::=
-   *         MULTI_LINE_STRING+
-   *       | SINGLE_LINE_STRING+
-   */
-  StringLiteral parseStringLiteral() {
-    List<StringLiteral> strings = new List<StringLiteral>();
-    while (_matches(TokenType.STRING)) {
-      Token string = getAndAdvance();
-      if (_matches(TokenType.STRING_INTERPOLATION_EXPRESSION) ||
-          _matches(TokenType.STRING_INTERPOLATION_IDENTIFIER)) {
-        strings.add(_parseStringInterpolation(string));
-      } else {
-        strings.add(new SimpleStringLiteral(
-            string, _computeStringValue(string.lexeme, true, true)));
-      }
-    }
-    if (strings.length < 1) {
-      _reportErrorForCurrentToken(ParserErrorCode.EXPECTED_STRING_LITERAL);
-      return _createSyntheticStringLiteral();
-    } else if (strings.length == 1) {
-      return strings[0];
-    } else {
-      return new AdjacentStrings(strings);
-    }
-  }
-
-  /**
-   * Parse a list of type arguments. Return the type argument list that was
-   * parsed.
-   *
-   *     typeArguments ::=
-   *         '<' typeList '>'
-   *
-   *     typeList ::=
-   *         type (',' type)*
-   */
-  TypeArgumentList parseTypeArgumentList() {
-    Token leftBracket = _expect(TokenType.LT);
-    List<TypeName> arguments = new List<TypeName>();
-    arguments.add(parseTypeName());
-    while (_optional(TokenType.COMMA)) {
-      arguments.add(parseTypeName());
-    }
-    Token rightBracket = _expectGt();
-    return new TypeArgumentList(leftBracket, arguments, rightBracket);
-  }
-
-  /**
-   * Parse a type name. Return the type name that was parsed.
-   *
-   *     type ::=
-   *         qualified typeArguments?
-   */
-  TypeName parseTypeName() {
-    Identifier typeName;
-    if (_matchesKeyword(Keyword.VAR)) {
-      _reportErrorForCurrentToken(ParserErrorCode.VAR_AS_TYPE_NAME);
-      typeName = new SimpleIdentifier(getAndAdvance());
-    } else if (_matchesIdentifier()) {
-      typeName = parsePrefixedIdentifier();
-    } else {
-      typeName = _createSyntheticIdentifier();
-      _reportErrorForCurrentToken(ParserErrorCode.EXPECTED_TYPE_NAME);
-    }
-    TypeArgumentList typeArguments = null;
-    if (_matches(TokenType.LT)) {
-      typeArguments = parseTypeArgumentList();
-    }
-    return new TypeName(typeName, typeArguments);
-  }
-
-  /**
-   * Parse a type parameter. Return the type parameter that was parsed.
-   *
-   *     typeParameter ::=
-   *         metadata name ('extends' bound)?
-   */
-  TypeParameter parseTypeParameter() {
-    CommentAndMetadata commentAndMetadata = _parseCommentAndMetadata();
-    SimpleIdentifier name = parseSimpleIdentifier();
-    if (_matchesKeyword(Keyword.EXTENDS)) {
-      Token keyword = getAndAdvance();
-      TypeName bound = parseTypeName();
-      return new TypeParameter(commentAndMetadata.comment,
-          commentAndMetadata.metadata, name, keyword, bound);
-    }
-    return new TypeParameter(commentAndMetadata.comment,
-        commentAndMetadata.metadata, name, null, null);
-  }
-
-  /**
-   * Parse a list of type parameters. Return the list of type parameters that
-   * were parsed.
-   *
-   *     typeParameterList ::=
-   *         '<' typeParameter (',' typeParameter)* '>'
-   */
-  TypeParameterList parseTypeParameterList() {
-    Token leftBracket = _expect(TokenType.LT);
-    List<TypeParameter> typeParameters = new List<TypeParameter>();
-    typeParameters.add(parseTypeParameter());
-    while (_optional(TokenType.COMMA)) {
-      typeParameters.add(parseTypeParameter());
-    }
-    Token rightBracket = _expectGt();
-    return new TypeParameterList(leftBracket, typeParameters, rightBracket);
-  }
-
-  /**
-   * Parse a with clause. Return the with clause that was parsed.
-   *
-   *     withClause ::=
-   *         'with' typeName (',' typeName)*
-   */
-  WithClause parseWithClause() {
-    Token with2 = _expectKeyword(Keyword.WITH);
-    List<TypeName> types = new List<TypeName>();
-    types.add(parseTypeName());
-    while (_optional(TokenType.COMMA)) {
-      types.add(parseTypeName());
-    }
-    return new WithClause(with2, types);
-  }
-
-  /**
-   * Advance to the next token in the token stream.
-   */
-  void _advance() {
-    _currentToken = _currentToken.next;
-  }
-
-  /**
-   * Append the character equivalent of the given [scalarValue] to the given
-   * [builder]. Use the [startIndex] and [endIndex] to report an error, and
-   * don't append anything to the builder, if the scalar value is invalid. The
-   * [escapeSequence] is the escape sequence that was parsed to produce the
-   * scalar value (used for error reporting).
-   */
-  void _appendScalarValue(StringBuffer buffer, String escapeSequence,
-      int scalarValue, int startIndex, int endIndex) {
-    if (scalarValue < 0 ||
-        scalarValue > Character.MAX_CODE_POINT ||
-        (scalarValue >= 0xD800 && scalarValue <= 0xDFFF)) {
-      _reportErrorForCurrentToken(
-          ParserErrorCode.INVALID_CODE_POINT, [escapeSequence]);
-      return;
-    }
-    if (scalarValue < Character.MAX_VALUE) {
-      buffer.writeCharCode(scalarValue);
-    } else {
-      buffer.write(Character.toChars(scalarValue));
-    }
-  }
-
-  /**
-   * Return the content of a string with the given literal representation. The
-   * [lexeme] is the literal representation of the string. The flag [isFirst] is
-   * `true` if this is the first token in a string literal. The flag [isLast] is
-   * `true` if this is the last token in a string literal.
-   */
-  String _computeStringValue(String lexeme, bool isFirst, bool isLast) {
-    StringLexemeHelper helper = new StringLexemeHelper(lexeme, isFirst, isLast);
-    int start = helper.start;
-    int end = helper.end;
-    bool stringEndsAfterStart = end >= start;
-    assert(stringEndsAfterStart);
-    if (!stringEndsAfterStart) {
-      AnalysisEngine.instance.logger.logError(
-          "Internal error: computeStringValue($lexeme, $isFirst, $isLast)");
-      return "";
-    }
-    if (helper.isRaw) {
-      return lexeme.substring(start, end);
-    }
-    StringBuffer buffer = new StringBuffer();
-    int index = start;
-    while (index < end) {
-      index = _translateCharacter(buffer, lexeme, index);
-    }
-    return buffer.toString();
-  }
-
-  /**
-   * Convert the given [method] declaration into the nearest valid top-level
-   * function declaration (that is, the function declaration that most closely
-   * captures the components of the given method declaration).
-   */
-  FunctionDeclaration _convertToFunctionDeclaration(MethodDeclaration method) =>
-      new FunctionDeclaration(method.documentationComment, method.metadata,
-          method.externalKeyword, method.returnType, method.propertyKeyword,
-          method.name, new FunctionExpression(
-              method.typeParameters, method.parameters, method.body));
-
-  /**
-   * Return `true` if the current token could be the start of a compilation unit
-   * member. This method is used for recovery purposes to decide when to stop
-   * skipping tokens after finding an error while parsing a compilation unit
-   * member.
-   */
-  bool _couldBeStartOfCompilationUnitMember() {
-    if ((_matchesKeyword(Keyword.IMPORT) ||
-            _matchesKeyword(Keyword.EXPORT) ||
-            _matchesKeyword(Keyword.LIBRARY) ||
-            _matchesKeyword(Keyword.PART)) &&
-        !_tokenMatches(_peek(), TokenType.PERIOD) &&
-        !_tokenMatches(_peek(), TokenType.LT)) {
-      // This looks like the start of a directive
-      return true;
-    } else if (_matchesKeyword(Keyword.CLASS)) {
-      // This looks like the start of a class definition
-      return true;
-    } else if (_matchesKeyword(Keyword.TYPEDEF) &&
-        !_tokenMatches(_peek(), TokenType.PERIOD) &&
-        !_tokenMatches(_peek(), TokenType.LT)) {
-      // This looks like the start of a typedef
-      return true;
-    } else if (_matchesKeyword(Keyword.VOID) ||
-        ((_matchesKeyword(Keyword.GET) || _matchesKeyword(Keyword.SET)) &&
-            _tokenMatchesIdentifier(_peek())) ||
-        (_matchesKeyword(Keyword.OPERATOR) && _isOperator(_peek()))) {
-      // This looks like the start of a function
-      return true;
-    } else if (_matchesIdentifier()) {
-      if (_tokenMatches(_peek(), TokenType.OPEN_PAREN)) {
-        // This looks like the start of a function
-        return true;
-      }
-      Token token = _skipReturnType(_currentToken);
-      if (token == null) {
-        return false;
-      }
-      if (_matchesKeyword(Keyword.GET) ||
-          _matchesKeyword(Keyword.SET) ||
-          (_matchesKeyword(Keyword.OPERATOR) && _isOperator(_peek())) ||
-          _matchesIdentifier()) {
-        return true;
-      }
-    }
-    return false;
-  }
-
-  /**
-   * Return a synthetic identifier.
-   */
-  SimpleIdentifier _createSyntheticIdentifier() {
-    Token syntheticToken;
-    if (_currentToken.type == TokenType.KEYWORD) {
-      // Consider current keyword token as an identifier.
-      // It is not always true, e.g. "^is T" where "^" is place the place for
-      // synthetic identifier. By creating SyntheticStringToken we can
-      // distinguish a real identifier from synthetic. In the code completion
-      // behavior will depend on a cursor position - before or on "is".
-      syntheticToken = _injectToken(new SyntheticStringToken(
-          TokenType.IDENTIFIER, _currentToken.lexeme, _currentToken.offset));
-    } else {
-      syntheticToken = _createSyntheticToken(TokenType.IDENTIFIER);
-    }
-    return new SimpleIdentifier(syntheticToken);
-  }
-
-  /**
-   * Return a synthetic token representing the given [keyword].
-   */
-  Token _createSyntheticKeyword(Keyword keyword) => _injectToken(
-      new Parser_SyntheticKeywordToken(keyword, _currentToken.offset));
-
-  /**
-   * Return a synthetic string literal.
-   */
-  SimpleStringLiteral _createSyntheticStringLiteral() =>
-      new SimpleStringLiteral(_createSyntheticToken(TokenType.STRING), "");
-
-  /**
-   * Return a synthetic token with the given [type].
-   */
-  Token _createSyntheticToken(TokenType type) =>
-      _injectToken(new StringToken(type, "", _currentToken.offset));
-
-  /**
-   * Create and return a new token with the given [type]. The token will replace
-   * the first portion of the given [token], so it will have the same offset and
-   * will have any comments that might have preceeded the token.
-   */
-  Token _createToken(Token token, TokenType type, {bool isBegin: false}) {
-    CommentToken comments = token.precedingComments;
-    if (comments == null) {
-      if (isBegin) {
-        return new BeginToken(type, token.offset);
-      }
-      return new Token(type, token.offset);
-    } else if (isBegin) {
-      return new BeginTokenWithComment(type, token.offset, comments);
-    }
-    return new TokenWithComment(type, token.offset, comments);
-  }
-
-  /**
-   * Check that the given [expression] is assignable and report an error if it
-   * isn't.
-   *
-   *     assignableExpression ::=
-   *         primary (arguments* assignableSelector)+
-   *       | 'super' unconditionalAssignableSelector
-   *       | identifier
-   *
-   *     unconditionalAssignableSelector ::=
-   *         '[' expression ']'
-   *       | '.' identifier
-   *
-   *     assignableSelector ::=
-   *         unconditionalAssignableSelector
-   *       | '?.' identifier
-   */
-  void _ensureAssignable(Expression expression) {
-    if (expression != null && !expression.isAssignable) {
-      _reportErrorForCurrentToken(
-          ParserErrorCode.ILLEGAL_ASSIGNMENT_TO_NON_ASSIGNABLE);
-    }
-  }
-
-  /**
-   * If the current token has the expected type, return it after advancing to
-   * the next token. Otherwise report an error and return the current token
-   * without advancing.
-   *
-   * Note that the method [_expectGt] should be used if the argument to this
-   * method would be [TokenType.GT].
-   *
-   * The [type] is the type of token that is expected.
-   */
-  Token _expect(TokenType type) {
-    if (_matches(type)) {
-      return getAndAdvance();
-    }
-    // Remove uses of this method in favor of matches?
-    // Pass in the error code to use to report the error?
-    if (type == TokenType.SEMICOLON) {
-      if (_tokenMatches(_currentToken.next, TokenType.SEMICOLON)) {
-        _reportErrorForCurrentToken(
-            ParserErrorCode.UNEXPECTED_TOKEN, [_currentToken.lexeme]);
-        _advance();
-        return getAndAdvance();
-      }
-      _reportErrorForToken(ParserErrorCode.EXPECTED_TOKEN,
-          _currentToken.previous, [type.lexeme]);
-    } else {
-      _reportErrorForCurrentToken(
-          ParserErrorCode.EXPECTED_TOKEN, [type.lexeme]);
-    }
-    return _currentToken;
-  }
-
-  /**
-   * If the current token has the type [TokenType.GT], return it after advancing
-   * to the next token. Otherwise report an error and return the current token
-   * without advancing.
-   */
-  Token _expectGt() {
-    if (_matchesGt()) {
-      return getAndAdvance();
-    }
-    _reportErrorForCurrentToken(
-        ParserErrorCode.EXPECTED_TOKEN, [TokenType.GT.lexeme]);
-    return _currentToken;
-  }
-
-  /**
-   * If the current token is a keyword matching the given [keyword], return it
-   * after advancing to the next token. Otherwise report an error and return the
-   * current token without advancing.
-   */
-  Token _expectKeyword(Keyword keyword) {
-    if (_matchesKeyword(keyword)) {
-      return getAndAdvance();
-    }
-    // Remove uses of this method in favor of matches?
-    // Pass in the error code to use to report the error?
-    _reportErrorForCurrentToken(
-        ParserErrorCode.EXPECTED_TOKEN, [keyword.syntax]);
-    return _currentToken;
-  }
-
-  /**
-   * If the current token is a semicolon, return it after advancing to the next
-   * token. Otherwise report an error and create a synthetic semicolon.
-   */
-  Token _expectSemicolon() {
-    // TODO(scheglov) consider pushing this behavior into [_expect]
-    if (_matches(TokenType.SEMICOLON)) {
-      return getAndAdvance();
-    } else {
-      _reportErrorForToken(
-          ParserErrorCode.EXPECTED_TOKEN, _currentToken.previous, [";"]);
-      return _createSyntheticToken(TokenType.SEMICOLON);
-    }
-  }
-
-  /**
-   * Search the given list of [ranges] for a range that contains the given
-   * [index]. Return the range that was found, or `null` if none of the ranges
-   * contain the index.
-   */
-  List<int> _findRange(List<List<int>> ranges, int index) {
-    int rangeCount = ranges.length;
-    for (int i = 0; i < rangeCount; i++) {
-      List<int> range = ranges[i];
-      if (range[0] <= index && index <= range[1]) {
-        return range;
-      } else if (index < range[0]) {
-        return null;
-      }
-    }
-    return null;
-  }
-
-  /**
-   * Return a list of the ranges of characters in the given [comment] that
-   * should be treated as code blocks.
-   */
-  List<List<int>> _getCodeBlockRanges(String comment) {
-    List<List<int>> ranges = new List<List<int>>();
-    int length = comment.length;
-    if (length < 3) {
-      return ranges;
-    }
-    int index = 0;
-    int firstChar = comment.codeUnitAt(0);
-    if (firstChar == 0x2F) {
-      int secondChar = comment.codeUnitAt(1);
-      int thirdChar = comment.codeUnitAt(2);
-      if ((secondChar == 0x2A && thirdChar == 0x2A) ||
-          (secondChar == 0x2F && thirdChar == 0x2F)) {
-        index = 3;
-      }
-    }
-    while (index < length) {
-      int currentChar = comment.codeUnitAt(index);
-      if (currentChar == 0xD || currentChar == 0xA) {
-        index = index + 1;
-        while (index < length &&
-            Character.isWhitespace(comment.codeUnitAt(index))) {
-          index = index + 1;
-        }
-        if (StringUtilities.startsWith6(
-            comment, index, 0x2A, 0x20, 0x20, 0x20, 0x20, 0x20)) {
-          int end = index + 6;
-          while (end < length &&
-              comment.codeUnitAt(end) != 0xD &&
-              comment.codeUnitAt(end) != 0xA) {
-            end = end + 1;
-          }
-          ranges.add(<int>[index, end]);
-          index = end;
-        }
-      } else if (index + 1 < length &&
-          currentChar == 0x5B &&
-          comment.codeUnitAt(index + 1) == 0x3A) {
-        int end = StringUtilities.indexOf2(comment, index + 2, 0x3A, 0x5D);
-        if (end < 0) {
-          end = length;
-        }
-        ranges.add(<int>[index, end]);
-        index = end + 1;
-      } else {
-        index = index + 1;
-      }
-    }
-    return ranges;
-  }
-
-  /**
-   * Return the end token associated with the given [beginToken], or `null` if
-   * either the given token is not a begin token or it does not have an end
-   * token associated with it.
-   */
-  Token _getEndToken(Token beginToken) {
-    if (beginToken is BeginToken) {
-      return beginToken.endToken;
-    }
-    return null;
-  }
-
-  /**
-   * Inject the given [token] into the token stream immediately before the
-   * current token.
-   */
-  Token _injectToken(Token token) {
-    Token previous = _currentToken.previous;
-    token.setNext(_currentToken);
-    previous.setNext(token);
-    return token;
-  }
-
-  /**
-   * Return `true` if the current token appears to be the beginning of a
-   * function declaration.
-   */
-  bool _isFunctionDeclaration() {
-    if (_matchesKeyword(Keyword.VOID)) {
-      return true;
-    }
-    Token afterReturnType = _skipTypeName(_currentToken);
-    if (afterReturnType == null) {
-      // There was no return type, but it is optional, so go back to where we
-      // started.
-      afterReturnType = _currentToken;
-    }
-    Token afterIdentifier = _skipSimpleIdentifier(afterReturnType);
-    if (afterIdentifier == null) {
-      // It's possible that we parsed the function name as if it were a type
-      // name, so see whether it makes sense if we assume that there is no type.
-      afterIdentifier = _skipSimpleIdentifier(_currentToken);
-    }
-    if (afterIdentifier == null) {
-      return false;
-    }
-    if (_isFunctionExpression(afterIdentifier)) {
-      return true;
-    }
-    // It's possible that we have found a getter. While this isn't valid at this
-    // point we test for it in order to recover better.
-    if (_matchesKeyword(Keyword.GET)) {
-      Token afterName = _skipSimpleIdentifier(_currentToken.next);
-      if (afterName == null) {
-        return false;
-      }
-      return _tokenMatches(afterName, TokenType.FUNCTION) ||
-          _tokenMatches(afterName, TokenType.OPEN_CURLY_BRACKET);
-    } else if (_tokenMatchesKeyword(afterReturnType, Keyword.GET)) {
-      Token afterName = _skipSimpleIdentifier(afterReturnType.next);
-      if (afterName == null) {
-        return false;
-      }
-      return _tokenMatches(afterName, TokenType.FUNCTION) ||
-          _tokenMatches(afterName, TokenType.OPEN_CURLY_BRACKET);
-    }
-    return false;
-  }
-
-  /**
-   * Return `true` if the given [token] appears to be the beginning of a
-   * function expression.
-   */
-  bool _isFunctionExpression(Token token) {
-    // Function expressions aren't allowed in initializer lists.
-    if (_inInitializer) {
-      return false;
-    }
-    Token afterTypeParameters = _skipTypeParameterList(token);
-    if (afterTypeParameters == null) {
-      afterTypeParameters = token;
-    }
-    Token afterParameters = _skipFormalParameterList(afterTypeParameters);
-    if (afterParameters == null) {
-      return false;
-    }
-    if (afterParameters
-        .matchesAny([TokenType.OPEN_CURLY_BRACKET, TokenType.FUNCTION])) {
-      return true;
-    }
-    String lexeme = afterParameters.lexeme;
-    return lexeme == ASYNC || lexeme == SYNC;
-  }
-
-  /**
-   * Return `true` if the given [character] is a valid hexadecimal digit.
-   */
-  bool _isHexDigit(int character) => (0x30 <= character && character <= 0x39) ||
-      (0x41 <= character && character <= 0x46) ||
-      (0x61 <= character && character <= 0x66);
-
-  /**
-   * Return `true` if the current token is the first token in an initialized
-   * variable declaration rather than an expression. This method assumes that we
-   * have already skipped past any metadata that might be associated with the
-   * declaration.
-   *
-   *     initializedVariableDeclaration ::=
-   *         declaredIdentifier ('=' expression)? (',' initializedIdentifier)*
-   *
-   *     declaredIdentifier ::=
-   *         metadata finalConstVarOrType identifier
-   *
-   *     finalConstVarOrType ::=
-   *         'final' type?
-   *       | 'const' type?
-   *       | 'var'
-   *       | type
-   *
-   *     type ::=
-   *         qualified typeArguments?
-   *
-   *     initializedIdentifier ::=
-   *         identifier ('=' expression)?
-   */
-  bool _isInitializedVariableDeclaration() {
-    if (_matchesKeyword(Keyword.FINAL) || _matchesKeyword(Keyword.VAR)) {
-      // An expression cannot start with a keyword other than 'const',
-      // 'rethrow', or 'throw'.
-      return true;
-    }
-    if (_matchesKeyword(Keyword.CONST)) {
-      // Look to see whether we might be at the start of a list or map literal,
-      // otherwise this should be the start of a variable declaration.
-      return !_peek().matchesAny([
-        TokenType.LT,
-        TokenType.OPEN_CURLY_BRACKET,
-        TokenType.OPEN_SQUARE_BRACKET,
-        TokenType.INDEX
-      ]);
-    }
-    // We know that we have an identifier, and need to see whether it might be
-    // a type name.
-    Token token = _skipTypeName(_currentToken);
-    if (token == null) {
-      // There was no type name, so this can't be a declaration.
-      return false;
-    }
-    token = _skipSimpleIdentifier(token);
-    if (token == null) {
-      return false;
-    }
-    TokenType type = token.type;
-    return type == TokenType.EQ ||
-        type == TokenType.COMMA ||
-        type == TokenType.SEMICOLON ||
-        _tokenMatchesKeyword(token, Keyword.IN);
-  }
-
-  bool _isLikelyParameterList() {
-    if (_matches(TokenType.OPEN_PAREN)) {
-      return true;
-    }
-    if (!parseGenericMethods) {
-      return false;
-    }
-    Token token = _skipTypeArgumentList(_currentToken);
-    return token != null && _tokenMatches(token, TokenType.OPEN_PAREN);
-  }
-
-  /**
-   * Given that we have just found bracketed text within the given [comment],
-   * look to see whether that text is (a) followed by a parenthesized link
-   * address, (b) followed by a colon, or (c) followed by optional whitespace
-   * and another square bracket. The [rightIndex] is the index of the right
-   * bracket. Return `true` if the bracketed text is followed by a link address.
-   *
-   * This method uses the syntax described by the
-   * <a href="http://daringfireball.net/projects/markdown/syntax">markdown</a>
-   * project.
-   */
-  bool _isLinkText(String comment, int rightIndex) {
-    int length = comment.length;
-    int index = rightIndex + 1;
-    if (index >= length) {
-      return false;
-    }
-    int nextChar = comment.codeUnitAt(index);
-    if (nextChar == 0x28 || nextChar == 0x3A) {
-      return true;
-    }
-    while (Character.isWhitespace(nextChar)) {
-      index = index + 1;
-      if (index >= length) {
-        return false;
-      }
-      nextChar = comment.codeUnitAt(index);
-    }
-    return nextChar == 0x5B;
-  }
-
-  /**
-   * Return `true` if the given [startToken] appears to be the beginning of an
-   * operator declaration.
-   */
-  bool _isOperator(Token startToken) {
-    // Accept any operator here, even if it is not user definable.
-    if (!startToken.isOperator) {
-      return false;
-    }
-    // Token "=" means that it is actually field initializer.
-    if (startToken.type == TokenType.EQ) {
-      return false;
-    }
-    // Consume all operator tokens.
-    Token token = startToken.next;
-    while (token.isOperator) {
-      token = token.next;
-    }
-    // Formal parameter list is expect now.
-    return _tokenMatches(token, TokenType.OPEN_PAREN);
-  }
-
-  /**
-   * Return `true` if the current token appears to be the beginning of a switch
-   * member.
-   */
-  bool _isSwitchMember() {
-    Token token = _currentToken;
-    while (_tokenMatches(token, TokenType.IDENTIFIER) &&
-        _tokenMatches(token.next, TokenType.COLON)) {
-      token = token.next.next;
-    }
-    if (token.type == TokenType.KEYWORD) {
-      Keyword keyword = (token as KeywordToken).keyword;
-      return keyword == Keyword.CASE || keyword == Keyword.DEFAULT;
-    }
-    return false;
-  }
-
-  /**
-   * Return `true` if the [startToken] appears to be the first token of a type
-   * name that is followed by a variable or field formal parameter.
-   */
-  bool _isTypedIdentifier(Token startToken) {
-    Token token = _skipReturnType(startToken);
-    if (token == null) {
-      return false;
-    } else if (_tokenMatchesIdentifier(token)) {
-      return true;
-    } else if (_tokenMatchesKeyword(token, Keyword.THIS) &&
-        _tokenMatches(token.next, TokenType.PERIOD) &&
-        _tokenMatchesIdentifier(token.next.next)) {
-      return true;
-    } else if (_tokenMatchesKeyword(startToken, Keyword.VOID)) {
-      // The keyword 'void' isn't a valid identifier, so it should be assumed to
-      // be a type name.
-      return true;
-    } else if (startToken.next != token &&
-        !_tokenMatches(token, TokenType.OPEN_PAREN)) {
-      // The type is more than a simple identifier, so it should be assumed to
-      // be a type name.
-      return true;
-    }
-    return false;
-  }
-
-  /**
-   * Increments the error reporting lock level. If level is more than `0`, then
-   * [reportError] wont report any error.
-   */
-  void _lockErrorListener() {
-    _errorListenerLock++;
-  }
-
-  /**
-   * Return `true` if the current token has the given [type]. Note that the
-   * method [_matchesGt] should be used if the argument to this method would be
-   * [TokenType.GT].
-   */
-  bool _matches(TokenType type) => _currentToken.type == type;
-
-  /**
-   * Return `true` if the current token has a type of [TokenType.GT]. Note that
-   * this method, unlike other variants, will modify the token stream if
-   * possible to match desired type. In particular, if the next token is either
-   * a '>>' or '>>>', the token stream will be re-written and `true` will be
-   * returned.
-   */
-  bool _matchesGt() {
-    TokenType currentType = _currentToken.type;
-    if (currentType == TokenType.GT) {
-      return true;
-    } else if (currentType == TokenType.GT_GT) {
-      Token first = _createToken(_currentToken, TokenType.GT);
-      Token second = new Token(TokenType.GT, _currentToken.offset + 1);
-      second.setNext(_currentToken.next);
-      first.setNext(second);
-      _currentToken.previous.setNext(first);
-      _currentToken = first;
-      return true;
-    } else if (currentType == TokenType.GT_EQ) {
-      Token first = _createToken(_currentToken, TokenType.GT);
-      Token second = new Token(TokenType.EQ, _currentToken.offset + 1);
-      second.setNext(_currentToken.next);
-      first.setNext(second);
-      _currentToken.previous.setNext(first);
-      _currentToken = first;
-      return true;
-    } else if (currentType == TokenType.GT_GT_EQ) {
-      int offset = _currentToken.offset;
-      Token first = _createToken(_currentToken, TokenType.GT);
-      Token second = new Token(TokenType.GT, offset + 1);
-      Token third = new Token(TokenType.EQ, offset + 2);
-      third.setNext(_currentToken.next);
-      second.setNext(third);
-      first.setNext(second);
-      _currentToken.previous.setNext(first);
-      _currentToken = first;
-      return true;
-    }
-    return false;
-  }
-
-  /**
-   * Return `true` if the current token is a valid identifier. Valid identifiers
-   * include built-in identifiers (pseudo-keywords).
-   */
-  bool _matchesIdentifier() => _tokenMatchesIdentifier(_currentToken);
-
-  /**
-   * Return `true` if the current token matches the given [keyword].
-   */
-  bool _matchesKeyword(Keyword keyword) =>
-      _tokenMatchesKeyword(_currentToken, keyword);
-
-  /**
-   * Return `true` if the current token matches the given [identifier].
-   */
-  bool _matchesString(String identifier) =>
-      _currentToken.type == TokenType.IDENTIFIER &&
-          _currentToken.lexeme == identifier;
-
-  /**
-   * If the current token has the given [type], then advance to the next token
-   * and return `true`. Otherwise, return `false` without advancing. This method
-   * should not be invoked with an argument value of [TokenType.GT].
-   */
-  bool _optional(TokenType type) {
-    if (_matches(type)) {
-      _advance();
-      return true;
-    }
-    return false;
-  }
-
-  /**
-   * Parse an additive expression. Return the additive expression that was
-   * parsed.
-   *
-   *     additiveExpression ::=
-   *         multiplicativeExpression (additiveOperator multiplicativeExpression)*
-   *       | 'super' (additiveOperator multiplicativeExpression)+
-   */
-  Expression _parseAdditiveExpression() {
-    Expression expression;
-    if (_matchesKeyword(Keyword.SUPER) &&
-        _currentToken.next.type.isAdditiveOperator) {
-      expression = new SuperExpression(getAndAdvance());
-    } else {
-      expression = _parseMultiplicativeExpression();
-    }
-    while (_currentToken.type.isAdditiveOperator) {
-      Token operator = getAndAdvance();
-      expression = new BinaryExpression(
-          expression, operator, _parseMultiplicativeExpression());
-    }
-    return expression;
-  }
-
-  /**
-   * Parse an assert statement. Return the assert statement.
-   *
-   *     assertStatement ::=
-   *         'assert' '(' conditionalExpression ')' ';'
-   */
-  AssertStatement _parseAssertStatement() {
-    Token keyword = _expectKeyword(Keyword.ASSERT);
-    Token leftParen = _expect(TokenType.OPEN_PAREN);
-    Expression expression = parseExpression2();
-    if (expression is AssignmentExpression) {
-      _reportErrorForNode(
-          ParserErrorCode.ASSERT_DOES_NOT_TAKE_ASSIGNMENT, expression);
-    } else if (expression is CascadeExpression) {
-      _reportErrorForNode(
-          ParserErrorCode.ASSERT_DOES_NOT_TAKE_CASCADE, expression);
-    } else if (expression is ThrowExpression) {
-      _reportErrorForNode(
-          ParserErrorCode.ASSERT_DOES_NOT_TAKE_THROW, expression);
-    } else if (expression is RethrowExpression) {
-      _reportErrorForNode(
-          ParserErrorCode.ASSERT_DOES_NOT_TAKE_RETHROW, expression);
-    }
-    Token rightParen = _expect(TokenType.CLOSE_PAREN);
-    Token semicolon = _expect(TokenType.SEMICOLON);
-    return new AssertStatement(
-        keyword, leftParen, expression, rightParen, semicolon);
-  }
-
-  /**
-   * Parse an assignable expression. The [primaryAllowed] is `true` if the
-   * expression is allowed to be a primary without any assignable selector.
-   * Return the assignable expression that was parsed.
-   *
-   *     assignableExpression ::=
-   *         primary (arguments* assignableSelector)+
-   *       | 'super' unconditionalAssignableSelector
-   *       | identifier
-   */
-  Expression _parseAssignableExpression(bool primaryAllowed) {
-    if (_matchesKeyword(Keyword.SUPER)) {
-      return _parseAssignableSelector(
-          new SuperExpression(getAndAdvance()), false, allowConditional: false);
-    }
-    //
-    // A primary expression can start with an identifier. We resolve the
-    // ambiguity by determining whether the primary consists of anything other
-    // than an identifier and/or is followed by an assignableSelector.
-    //
-    Expression expression = _parsePrimaryExpression();
-    bool isOptional = primaryAllowed || expression is SimpleIdentifier;
-    while (true) {
-      while (_isLikelyParameterList()) {
-        TypeArgumentList typeArguments = null;
-        if (_matches(TokenType.LT)) {
-          typeArguments = parseTypeArgumentList();
-        }
-        ArgumentList argumentList = parseArgumentList();
-        if (expression is SimpleIdentifier) {
-          expression = new MethodInvocation(null, null,
-              expression as SimpleIdentifier, typeArguments, argumentList);
-        } else if (expression is PrefixedIdentifier) {
-          PrefixedIdentifier identifier = expression as PrefixedIdentifier;
-          expression = new MethodInvocation(identifier.prefix,
-              identifier.period, identifier.identifier, typeArguments,
-              argumentList);
-        } else if (expression is PropertyAccess) {
-          PropertyAccess access = expression as PropertyAccess;
-          expression = new MethodInvocation(access.target, access.operator,
-              access.propertyName, typeArguments, argumentList);
-        } else {
-          expression = new FunctionExpressionInvocation(
-              expression, typeArguments, argumentList);
-        }
-        if (!primaryAllowed) {
-          isOptional = false;
-        }
-      }
-      Expression selectorExpression = _parseAssignableSelector(
-          expression, isOptional || (expression is PrefixedIdentifier));
-      if (identical(selectorExpression, expression)) {
-        if (!isOptional && (expression is PrefixedIdentifier)) {
-          PrefixedIdentifier identifier = expression as PrefixedIdentifier;
-          expression = new PropertyAccess(
-              identifier.prefix, identifier.period, identifier.identifier);
-        }
-        return expression;
-      }
-      expression = selectorExpression;
-      isOptional = true;
-    }
-  }
-
-  /**
-   * Parse an assignable selector. The [prefix] is the expression preceding the
-   * selector. The [optional] is `true` if the selector is optional. Return the
-   * assignable selector that was parsed, or the original prefix if there was no
-   * assignable selector.  If [allowConditional] is false, then the '?.'
-   * operator will still be parsed, but a parse error will be generated.
-   *
-   *     unconditionalAssignableSelector ::=
-   *         '[' expression ']'
-   *       | '.' identifier
-   *
-   *     assignableSelector ::=
-   *         unconditionalAssignableSelector
-   *       | '?.' identifier
-   */
-  Expression _parseAssignableSelector(Expression prefix, bool optional,
-      {bool allowConditional: true}) {
-    if (_matches(TokenType.OPEN_SQUARE_BRACKET)) {
-      Token leftBracket = getAndAdvance();
-      bool wasInInitializer = _inInitializer;
-      _inInitializer = false;
-      try {
-        Expression index = parseExpression2();
-        Token rightBracket = _expect(TokenType.CLOSE_SQUARE_BRACKET);
-        return new IndexExpression.forTarget(
-            prefix, leftBracket, index, rightBracket);
-      } finally {
-        _inInitializer = wasInInitializer;
-      }
-    } else if (_matches(TokenType.PERIOD) ||
-        _matches(TokenType.QUESTION_PERIOD)) {
-      if (_matches(TokenType.QUESTION_PERIOD) && !allowConditional) {
-        _reportErrorForCurrentToken(
-            ParserErrorCode.INVALID_OPERATOR_FOR_SUPER, [_currentToken.lexeme]);
-      }
-      Token operator = getAndAdvance();
-      return new PropertyAccess(prefix, operator, parseSimpleIdentifier());
-    } else {
-      if (!optional) {
-        // Report the missing selector.
-        _reportErrorForCurrentToken(
-            ParserErrorCode.MISSING_ASSIGNABLE_SELECTOR);
-      }
-      return prefix;
-    }
-  }
-
-  /**
-   * Parse a await expression. Return the await expression that was parsed.
-   *
-   *     awaitExpression ::=
-   *         'await' unaryExpression
-   */
-  AwaitExpression _parseAwaitExpression() {
-    Token awaitToken = getAndAdvance();
-    Expression expression = _parseUnaryExpression();
-    return new AwaitExpression(awaitToken, expression);
-  }
-
-  /**
-   * Parse a bitwise and expression. Return the bitwise and expression that was
-   * parsed.
-   *
-   *     bitwiseAndExpression ::=
-   *         shiftExpression ('&' shiftExpression)*
-   *       | 'super' ('&' shiftExpression)+
-   */
-  Expression _parseBitwiseAndExpression() {
-    Expression expression;
-    if (_matchesKeyword(Keyword.SUPER) &&
-        _tokenMatches(_peek(), TokenType.AMPERSAND)) {
-      expression = new SuperExpression(getAndAdvance());
-    } else {
-      expression = _parseShiftExpression();
-    }
-    while (_matches(TokenType.AMPERSAND)) {
-      Token operator = getAndAdvance();
-      expression =
-          new BinaryExpression(expression, operator, _parseShiftExpression());
-    }
-    return expression;
-  }
-
-  /**
-   * Parse a bitwise exclusive-or expression. Return the bitwise exclusive-or
-   * expression that was parsed.
-   *
-   *     bitwiseXorExpression ::=
-   *         bitwiseAndExpression ('^' bitwiseAndExpression)*
-   *       | 'super' ('^' bitwiseAndExpression)+
-   */
-  Expression _parseBitwiseXorExpression() {
-    Expression expression;
-    if (_matchesKeyword(Keyword.SUPER) &&
-        _tokenMatches(_peek(), TokenType.CARET)) {
-      expression = new SuperExpression(getAndAdvance());
-    } else {
-      expression = _parseBitwiseAndExpression();
-    }
-    while (_matches(TokenType.CARET)) {
-      Token operator = getAndAdvance();
-      expression = new BinaryExpression(
-          expression, operator, _parseBitwiseAndExpression());
-    }
-    return expression;
-  }
-
-  /**
-   * Parse a break statement. Return the break statement that was parsed.
-   *
-   *     breakStatement ::=
-   *         'break' identifier? ';'
-   */
-  Statement _parseBreakStatement() {
-    Token breakKeyword = _expectKeyword(Keyword.BREAK);
-    SimpleIdentifier label = null;
-    if (_matchesIdentifier()) {
-      label = parseSimpleIdentifier();
-    }
-    if (!_inLoop && !_inSwitch && label == null) {
-      _reportErrorForToken(ParserErrorCode.BREAK_OUTSIDE_OF_LOOP, breakKeyword);
-    }
-    Token semicolon = _expect(TokenType.SEMICOLON);
-    return new BreakStatement(breakKeyword, label, semicolon);
-  }
-
-  /**
-   * Parse a cascade section. Return the expression representing the cascaded
-   * method invocation.
-   *
-   *     cascadeSection ::=
-   *         '..' (cascadeSelector typeArguments? arguments*)
-   *         (assignableSelector typeArguments? arguments*)* cascadeAssignment?
-   *
-   *     cascadeSelector ::=
-   *         '[' expression ']'
-   *       | identifier
-   *
-   *     cascadeAssignment ::=
-   *         assignmentOperator expressionWithoutCascade
-   */
-  Expression _parseCascadeSection() {
-    Token period = _expect(TokenType.PERIOD_PERIOD);
-    Expression expression = null;
-    SimpleIdentifier functionName = null;
-    if (_matchesIdentifier()) {
-      functionName = parseSimpleIdentifier();
-    } else if (_currentToken.type == TokenType.OPEN_SQUARE_BRACKET) {
-      Token leftBracket = getAndAdvance();
-      bool wasInInitializer = _inInitializer;
-      _inInitializer = false;
-      try {
-        Expression index = parseExpression2();
-        Token rightBracket = _expect(TokenType.CLOSE_SQUARE_BRACKET);
-        expression = new IndexExpression.forCascade(
-            period, leftBracket, index, rightBracket);
-        period = null;
-      } finally {
-        _inInitializer = wasInInitializer;
-      }
-    } else {
-      _reportErrorForToken(ParserErrorCode.MISSING_IDENTIFIER, _currentToken,
-          [_currentToken.lexeme]);
-      functionName = _createSyntheticIdentifier();
-    }
-    assert((expression == null && functionName != null) ||
-        (expression != null && functionName == null));
-    if (_isLikelyParameterList()) {
-      while (_isLikelyParameterList()) {
-        TypeArgumentList typeArguments = null;
-        if (_matches(TokenType.LT)) {
-          typeArguments = parseTypeArgumentList();
-        }
-        if (functionName != null) {
-          expression = new MethodInvocation(expression, period, functionName,
-              typeArguments, parseArgumentList());
-          period = null;
-          functionName = null;
-        } else if (expression == null) {
-          // It should not be possible to get here.
-          expression = new MethodInvocation(expression, period,
-              _createSyntheticIdentifier(), typeArguments, parseArgumentList());
-        } else {
-          expression = new FunctionExpressionInvocation(
-              expression, typeArguments, parseArgumentList());
-        }
-      }
-    } else if (functionName != null) {
-      expression = new PropertyAccess(expression, period, functionName);
-      period = null;
-    }
-    assert(expression != null);
-    bool progress = true;
-    while (progress) {
-      progress = false;
-      Expression selector = _parseAssignableSelector(expression, true);
-      if (!identical(selector, expression)) {
-        expression = selector;
-        progress = true;
-        while (_isLikelyParameterList()) {
-          TypeArgumentList typeArguments = null;
-          if (_matches(TokenType.LT)) {
-            typeArguments = parseTypeArgumentList();
-          }
-          if (expression is PropertyAccess) {
-            PropertyAccess propertyAccess = expression as PropertyAccess;
-            expression = new MethodInvocation(propertyAccess.target,
-                propertyAccess.operator, propertyAccess.propertyName,
-                typeArguments, parseArgumentList());
-          } else {
-            expression = new FunctionExpressionInvocation(
-                expression, typeArguments, parseArgumentList());
-          }
-        }
-      }
-    }
-    if (_currentToken.type.isAssignmentOperator) {
-      Token operator = getAndAdvance();
-      _ensureAssignable(expression);
-      expression = new AssignmentExpression(
-          expression, operator, parseExpressionWithoutCascade());
-    }
-    return expression;
-  }
-
-  /**
-   * Parse a class declaration. The [commentAndMetadata] is the metadata to be
-   * associated with the member. The [abstractKeyword] is the token for the
-   * keyword 'abstract', or `null` if the keyword was not given. Return the
-   * class declaration that was parsed.
-   *
-   *     classDeclaration ::=
-   *         metadata 'abstract'? 'class' name typeParameterList? (extendsClause withClause?)? implementsClause? '{' classMembers '}' |
-   *         metadata 'abstract'? 'class' mixinApplicationClass
-   */
-  CompilationUnitMember _parseClassDeclaration(
-      CommentAndMetadata commentAndMetadata, Token abstractKeyword) {
-    Token keyword = _expectKeyword(Keyword.CLASS);
-    if (_matchesIdentifier()) {
-      Token next = _peek();
-      if (_tokenMatches(next, TokenType.LT)) {
-        next = _skipTypeParameterList(next);
-        if (next != null && _tokenMatches(next, TokenType.EQ)) {
-          return _parseClassTypeAlias(
-              commentAndMetadata, abstractKeyword, keyword);
-        }
-      } else if (_tokenMatches(next, TokenType.EQ)) {
-        return _parseClassTypeAlias(
-            commentAndMetadata, abstractKeyword, keyword);
-      }
-    }
-    SimpleIdentifier name = parseSimpleIdentifier();
-    String className = name.name;
-    TypeParameterList typeParameters = null;
-    if (_matches(TokenType.LT)) {
-      typeParameters = parseTypeParameterList();
-    }
-    //
-    // Parse the clauses. The parser accepts clauses in any order, but will
-    // generate errors if they are not in the order required by the
-    // specification.
-    //
-    ExtendsClause extendsClause = null;
-    WithClause withClause = null;
-    ImplementsClause implementsClause = null;
-    bool foundClause = true;
-    while (foundClause) {
-      if (_matchesKeyword(Keyword.EXTENDS)) {
-        if (extendsClause == null) {
-          extendsClause = parseExtendsClause();
-          if (withClause != null) {
-            _reportErrorForToken(
-                ParserErrorCode.WITH_BEFORE_EXTENDS, withClause.withKeyword);
-          } else if (implementsClause != null) {
-            _reportErrorForToken(ParserErrorCode.IMPLEMENTS_BEFORE_EXTENDS,
-                implementsClause.implementsKeyword);
-          }
-        } else {
-          _reportErrorForToken(ParserErrorCode.MULTIPLE_EXTENDS_CLAUSES,
-              extendsClause.extendsKeyword);
-          parseExtendsClause();
-        }
-      } else if (_matchesKeyword(Keyword.WITH)) {
-        if (withClause == null) {
-          withClause = parseWithClause();
-          if (implementsClause != null) {
-            _reportErrorForToken(ParserErrorCode.IMPLEMENTS_BEFORE_WITH,
-                implementsClause.implementsKeyword);
-          }
-        } else {
-          _reportErrorForToken(
-              ParserErrorCode.MULTIPLE_WITH_CLAUSES, withClause.withKeyword);
-          parseWithClause();
-          // TODO(brianwilkerson) Should we merge the list of applied mixins
-          // into a single list?
-        }
-      } else if (_matchesKeyword(Keyword.IMPLEMENTS)) {
-        if (implementsClause == null) {
-          implementsClause = parseImplementsClause();
-        } else {
-          _reportErrorForToken(ParserErrorCode.MULTIPLE_IMPLEMENTS_CLAUSES,
-              implementsClause.implementsKeyword);
-          parseImplementsClause();
-          // TODO(brianwilkerson) Should we merge the list of implemented
-          // classes into a single list?
-        }
-      } else {
-        foundClause = false;
-      }
-    }
-    if (withClause != null && extendsClause == null) {
-      _reportErrorForToken(
-          ParserErrorCode.WITH_WITHOUT_EXTENDS, withClause.withKeyword);
-    }
-    //
-    // Look for and skip over the extra-lingual 'native' specification.
-    //
-    NativeClause nativeClause = null;
-    if (_matchesString(_NATIVE) && _tokenMatches(_peek(), TokenType.STRING)) {
-      nativeClause = _parseNativeClause();
-    }
-    //
-    // Parse the body of the class.
-    //
-    Token leftBracket = null;
-    List<ClassMember> members = null;
-    Token rightBracket = null;
-    if (_matches(TokenType.OPEN_CURLY_BRACKET)) {
-      leftBracket = _expect(TokenType.OPEN_CURLY_BRACKET);
-      members = _parseClassMembers(className, _getEndToken(leftBracket));
-      rightBracket = _expect(TokenType.CLOSE_CURLY_BRACKET);
-    } else {
-      leftBracket = _createSyntheticToken(TokenType.OPEN_CURLY_BRACKET);
-      rightBracket = _createSyntheticToken(TokenType.CLOSE_CURLY_BRACKET);
-      _reportErrorForCurrentToken(ParserErrorCode.MISSING_CLASS_BODY);
-    }
-    ClassDeclaration classDeclaration = new ClassDeclaration(
-        commentAndMetadata.comment, commentAndMetadata.metadata,
-        abstractKeyword, keyword, name, typeParameters, extendsClause,
-        withClause, implementsClause, leftBracket, members, rightBracket);
-    classDeclaration.nativeClause = nativeClause;
-    return classDeclaration;
-  }
-
-  /**
-   * Parse a list of class members. The [className] is the name of the class
-   * whose members are being parsed. The [closingBracket] is the closing bracket
-   * for the class, or `null` if the closing bracket is missing. Return the list
-   * of class members that were parsed.
-   *
-   *     classMembers ::=
-   *         (metadata memberDefinition)*
-   */
-  List<ClassMember> _parseClassMembers(String className, Token closingBracket) {
-    List<ClassMember> members = new List<ClassMember>();
-    Token memberStart = _currentToken;
-    while (!_matches(TokenType.EOF) &&
-        !_matches(TokenType.CLOSE_CURLY_BRACKET) &&
-        (closingBracket != null ||
-            (!_matchesKeyword(Keyword.CLASS) &&
-                !_matchesKeyword(Keyword.TYPEDEF)))) {
-      if (_matches(TokenType.SEMICOLON)) {
-        _reportErrorForToken(ParserErrorCode.UNEXPECTED_TOKEN, _currentToken,
-            [_currentToken.lexeme]);
-        _advance();
-      } else {
-        ClassMember member = parseClassMember(className);
-        if (member != null) {
-          members.add(member);
-        }
-      }
-      if (identical(_currentToken, memberStart)) {
-        _reportErrorForToken(ParserErrorCode.UNEXPECTED_TOKEN, _currentToken,
-            [_currentToken.lexeme]);
-        _advance();
-      }
-      memberStart = _currentToken;
-    }
-    return members;
-  }
-
-  /**
-   * Parse a class type alias. The [commentAndMetadata] is the metadata to be
-   * associated with the member. The [abstractKeyword] is the token representing
-   * the 'abstract' keyword. The [classKeyword] is the token representing the
-   * 'class' keyword. Return the class type alias that was parsed.
-   *
-   *     classTypeAlias ::=
-   *         identifier typeParameters? '=' 'abstract'? mixinApplication
-   *
-   *     mixinApplication ::=
-   *         type withClause implementsClause? ';'
-   */
-  ClassTypeAlias _parseClassTypeAlias(CommentAndMetadata commentAndMetadata,
-      Token abstractKeyword, Token classKeyword) {
-    SimpleIdentifier className = parseSimpleIdentifier();
-    TypeParameterList typeParameters = null;
-    if (_matches(TokenType.LT)) {
-      typeParameters = parseTypeParameterList();
-    }
-    Token equals = _expect(TokenType.EQ);
-    TypeName superclass = parseTypeName();
-    WithClause withClause = null;
-    if (_matchesKeyword(Keyword.WITH)) {
-      withClause = parseWithClause();
-    } else {
-      _reportErrorForCurrentToken(
-          ParserErrorCode.EXPECTED_TOKEN, [Keyword.WITH.syntax]);
-    }
-    ImplementsClause implementsClause = null;
-    if (_matchesKeyword(Keyword.IMPLEMENTS)) {
-      implementsClause = parseImplementsClause();
-    }
-    Token semicolon;
-    if (_matches(TokenType.SEMICOLON)) {
-      semicolon = getAndAdvance();
-    } else {
-      if (_matches(TokenType.OPEN_CURLY_BRACKET)) {
-        _reportErrorForCurrentToken(
-            ParserErrorCode.EXPECTED_TOKEN, [TokenType.SEMICOLON.lexeme]);
-        Token leftBracket = getAndAdvance();
-        _parseClassMembers(className.name, _getEndToken(leftBracket));
-        _expect(TokenType.CLOSE_CURLY_BRACKET);
-      } else {
-        _reportErrorForToken(ParserErrorCode.EXPECTED_TOKEN,
-            _currentToken.previous, [TokenType.SEMICOLON.lexeme]);
-      }
-      semicolon = _createSyntheticToken(TokenType.SEMICOLON);
-    }
-    return new ClassTypeAlias(commentAndMetadata.comment,
-        commentAndMetadata.metadata, classKeyword, className, typeParameters,
-        equals, abstractKeyword, superclass, withClause, implementsClause,
-        semicolon);
-  }
-
-  /**
-   * Parse a list of combinators in a directive. Return the combinators that
-   * were parsed.
-   *
-   *     combinator ::=
-   *         'show' identifier (',' identifier)*
-   *       | 'hide' identifier (',' identifier)*
-   */
-  List<Combinator> _parseCombinators() {
-    List<Combinator> combinators = new List<Combinator>();
-    while (true) {
-      Combinator combinator = parseCombinator();
-      if (combinator == null) {
-        break;
-      }
-      combinators.add(combinator);
-    }
-    return combinators;
-  }
-
-  /**
-   * Parse the documentation comment and metadata preceding a declaration. This
-   * method allows any number of documentation comments to occur before, after
-   * or between the metadata, but only returns the last (right-most)
-   * documentation comment that is found. Return the documentation comment and
-   * metadata that were parsed.
-   *
-   *     metadata ::=
-   *         annotation*
-   */
-  CommentAndMetadata _parseCommentAndMetadata() {
-    Comment comment = _parseDocumentationComment();
-    List<Annotation> metadata = new List<Annotation>();
-    while (_matches(TokenType.AT)) {
-      metadata.add(parseAnnotation());
-      Comment optionalComment = _parseDocumentationComment();
-      if (optionalComment != null) {
-        comment = optionalComment;
-      }
-    }
-    return new CommentAndMetadata(comment, metadata);
-  }
-
-  /**
-   * Parse a comment reference from the source between square brackets. The
-   * [referenceSource] is the source occurring between the square brackets
-   * within a documentation comment. The [sourceOffset] is the offset of the
-   * first character of the reference source. Return the comment reference that
-   * was parsed, or `null` if no reference could be found.
-   *
-   *     commentReference ::=
-   *         'new'? prefixedIdentifier
-   */
-  CommentReference _parseCommentReference(
-      String referenceSource, int sourceOffset) {
-    // TODO(brianwilkerson) The errors are not getting the right offset/length
-    // and are being duplicated.
-    if (referenceSource.length == 0) {
-      Token syntheticToken =
-          new SyntheticStringToken(TokenType.IDENTIFIER, "", sourceOffset);
-      return new CommentReference(null, new SimpleIdentifier(syntheticToken));
-    }
-    try {
-      BooleanErrorListener listener = new BooleanErrorListener();
-      Scanner scanner = new Scanner(
-          null, new SubSequenceReader(referenceSource, sourceOffset), listener);
-      scanner.setSourceStart(1, 1);
-      Token firstToken = scanner.tokenize();
-      if (listener.errorReported) {
-        return null;
-      }
-      Token newKeyword = null;
-      if (_tokenMatchesKeyword(firstToken, Keyword.NEW)) {
-        newKeyword = firstToken;
-        firstToken = firstToken.next;
-      }
-      if (_tokenMatchesIdentifier(firstToken)) {
-        Token secondToken = firstToken.next;
-        Token thirdToken = secondToken.next;
-        Token nextToken;
-        Identifier identifier;
-        if (_tokenMatches(secondToken, TokenType.PERIOD) &&
-            _tokenMatchesIdentifier(thirdToken)) {
-          identifier = new PrefixedIdentifier(new SimpleIdentifier(firstToken),
-              secondToken, new SimpleIdentifier(thirdToken));
-          nextToken = thirdToken.next;
-        } else {
-          identifier = new SimpleIdentifier(firstToken);
-          nextToken = firstToken.next;
-        }
-        if (nextToken.type != TokenType.EOF) {
-          return null;
-        }
-        return new CommentReference(newKeyword, identifier);
-      } else if (_tokenMatchesKeyword(firstToken, Keyword.THIS) ||
-          _tokenMatchesKeyword(firstToken, Keyword.NULL) ||
-          _tokenMatchesKeyword(firstToken, Keyword.TRUE) ||
-          _tokenMatchesKeyword(firstToken, Keyword.FALSE)) {
-        // TODO(brianwilkerson) If we want to support this we will need to
-        // extend the definition of CommentReference to take an expression
-        // rather than an identifier. For now we just ignore it to reduce the
-        // number of errors produced, but that's probably not a valid long term
-        // approach.
-        return null;
-      }
-    } catch (exception) {
-      // Ignored because we assume that it wasn't a real comment reference.
-    }
-    return null;
-  }
-
-  /**
-   * Parse all of the comment references occurring in the given array of
-   * documentation comments. The [tokens] are the comment tokens representing
-   * the documentation comments to be parsed. Return the comment references that
-   * were parsed.
-   *
-   *     commentReference ::=
-   *         '[' 'new'? qualified ']' libraryReference?
-   *
-   *     libraryReference ::=
-   *          '(' stringLiteral ')'
-   */
-  List<CommentReference> _parseCommentReferences(
-      List<DocumentationCommentToken> tokens) {
-    List<CommentReference> references = new List<CommentReference>();
-    for (DocumentationCommentToken token in tokens) {
-      String comment = token.lexeme;
-      int length = comment.length;
-      List<List<int>> codeBlockRanges = _getCodeBlockRanges(comment);
-      int leftIndex = comment.indexOf('[');
-      while (leftIndex >= 0 && leftIndex + 1 < length) {
-        List<int> range = _findRange(codeBlockRanges, leftIndex);
-        if (range == null) {
-          int nameOffset = token.offset + leftIndex + 1;
-          int rightIndex = JavaString.indexOf(comment, ']', leftIndex);
-          if (rightIndex >= 0) {
-            int firstChar = comment.codeUnitAt(leftIndex + 1);
-            if (firstChar != 0x27 && firstChar != 0x22) {
-              if (_isLinkText(comment, rightIndex)) {
-                // TODO(brianwilkerson) Handle the case where there's a library
-                // URI in the link text.
-              } else {
-                CommentReference reference = _parseCommentReference(
-                    comment.substring(leftIndex + 1, rightIndex), nameOffset);
-                if (reference != null) {
-                  references.add(reference);
-                  token.references.add(reference.beginToken);
-                }
-              }
-            }
-          } else {
-            // terminating ']' is not typed yet
-            int charAfterLeft = comment.codeUnitAt(leftIndex + 1);
-            if (Character.isLetterOrDigit(charAfterLeft)) {
-              int nameEnd = StringUtilities.indexOfFirstNotLetterDigit(
-                  comment, leftIndex + 1);
-              String name = comment.substring(leftIndex + 1, nameEnd);
-              Token nameToken =
-                  new StringToken(TokenType.IDENTIFIER, name, nameOffset);
-              references.add(
-                  new CommentReference(null, new SimpleIdentifier(nameToken)));
-            } else {
-              Token nameToken = new SyntheticStringToken(
-                  TokenType.IDENTIFIER, "", nameOffset);
-              references.add(
-                  new CommentReference(null, new SimpleIdentifier(nameToken)));
-            }
-            // next character
-            rightIndex = leftIndex + 1;
-          }
-          leftIndex = JavaString.indexOf(comment, '[', rightIndex);
-        } else {
-          leftIndex = JavaString.indexOf(comment, '[', range[1] + 1);
-        }
-      }
-    }
-    return references;
-  }
-
-  /**
-   * Parse a compilation unit member. The [commentAndMetadata] is the metadata
-   * to be associated with the member. Return the compilation unit member that
-   * was parsed, or `null` if what was parsed could not be represented as a
-   * compilation unit member.
-   *
-   *     compilationUnitMember ::=
-   *         classDefinition
-   *       | functionTypeAlias
-   *       | external functionSignature
-   *       | external getterSignature
-   *       | external setterSignature
-   *       | functionSignature functionBody
-   *       | returnType? getOrSet identifier formalParameterList functionBody
-   *       | (final | const) type? staticFinalDeclarationList ';'
-   *       | variableDeclaration ';'
-   */
-  CompilationUnitMember _parseCompilationUnitMember(
-      CommentAndMetadata commentAndMetadata) {
-    Modifiers modifiers = _parseModifiers();
-    if (_matchesKeyword(Keyword.CLASS)) {
-      return _parseClassDeclaration(
-          commentAndMetadata, _validateModifiersForClass(modifiers));
-    } else if (_matchesKeyword(Keyword.TYPEDEF) &&
-        !_tokenMatches(_peek(), TokenType.PERIOD) &&
-        !_tokenMatches(_peek(), TokenType.LT) &&
-        !_tokenMatches(_peek(), TokenType.OPEN_PAREN)) {
-      _validateModifiersForTypedef(modifiers);
-      return _parseTypeAlias(commentAndMetadata);
-    } else if (_matchesKeyword(Keyword.ENUM)) {
-      _validateModifiersForEnum(modifiers);
-      return _parseEnumDeclaration(commentAndMetadata);
-    }
-    if (_matchesKeyword(Keyword.VOID)) {
-      TypeName returnType = parseReturnType();
-      if ((_matchesKeyword(Keyword.GET) || _matchesKeyword(Keyword.SET)) &&
-          _tokenMatchesIdentifier(_peek())) {
-        _validateModifiersForTopLevelFunction(modifiers);
-        return _parseFunctionDeclaration(
-            commentAndMetadata, modifiers.externalKeyword, returnType);
-      } else if (_matchesKeyword(Keyword.OPERATOR) && _isOperator(_peek())) {
-        _reportErrorForToken(ParserErrorCode.TOP_LEVEL_OPERATOR, _currentToken);
-        return _convertToFunctionDeclaration(_parseOperator(
-            commentAndMetadata, modifiers.externalKeyword, returnType));
-      } else if (_matchesIdentifier() &&
-          _peek().matchesAny([
-        TokenType.OPEN_PAREN,
-        TokenType.OPEN_CURLY_BRACKET,
-        TokenType.FUNCTION
-      ])) {
-        _validateModifiersForTopLevelFunction(modifiers);
-        return _parseFunctionDeclaration(
-            commentAndMetadata, modifiers.externalKeyword, returnType);
-      } else {
-        //
-        // We have found an error of some kind. Try to recover.
-        //
-        if (_matchesIdentifier()) {
-          if (_peek().matchesAny(
-              [TokenType.EQ, TokenType.COMMA, TokenType.SEMICOLON])) {
-            //
-            // We appear to have a variable declaration with a type of "void".
-            //
-            _reportErrorForNode(ParserErrorCode.VOID_VARIABLE, returnType);
-            return new TopLevelVariableDeclaration(commentAndMetadata.comment,
-                commentAndMetadata.metadata,
-                _parseVariableDeclarationListAfterType(null,
-                    _validateModifiersForTopLevelVariable(modifiers), null),
-                _expect(TokenType.SEMICOLON));
-          }
-        }
-        _reportErrorForToken(
-            ParserErrorCode.EXPECTED_EXECUTABLE, _currentToken);
-        return null;
-      }
-    } else if ((_matchesKeyword(Keyword.GET) || _matchesKeyword(Keyword.SET)) &&
-        _tokenMatchesIdentifier(_peek())) {
-      _validateModifiersForTopLevelFunction(modifiers);
-      return _parseFunctionDeclaration(
-          commentAndMetadata, modifiers.externalKeyword, null);
-    } else if (_matchesKeyword(Keyword.OPERATOR) && _isOperator(_peek())) {
-      _reportErrorForToken(ParserErrorCode.TOP_LEVEL_OPERATOR, _currentToken);
-      return _convertToFunctionDeclaration(
-          _parseOperator(commentAndMetadata, modifiers.externalKeyword, null));
-    } else if (!_matchesIdentifier()) {
-      Token keyword = modifiers.varKeyword;
-      if (keyword == null) {
-        keyword = modifiers.finalKeyword;
-      }
-      if (keyword == null) {
-        keyword = modifiers.constKeyword;
-      }
-      if (keyword != null) {
-        //
-        // We appear to have found an incomplete top-level variable declaration.
-        //
-        _reportErrorForCurrentToken(ParserErrorCode.MISSING_IDENTIFIER);
-        List<VariableDeclaration> variables = new List<VariableDeclaration>();
-        variables.add(
-            new VariableDeclaration(_createSyntheticIdentifier(), null, null));
-        return new TopLevelVariableDeclaration(commentAndMetadata.comment,
-            commentAndMetadata.metadata,
-            new VariableDeclarationList(null, null, keyword, null, variables),
-            _expectSemicolon());
-      }
-      _reportErrorForToken(ParserErrorCode.EXPECTED_EXECUTABLE, _currentToken);
-      return null;
-    } else if (_tokenMatches(_peek(), TokenType.OPEN_PAREN)) {
-      _validateModifiersForTopLevelFunction(modifiers);
-      return _parseFunctionDeclaration(
-          commentAndMetadata, modifiers.externalKeyword, null);
-    } else if (_peek()
-        .matchesAny([TokenType.EQ, TokenType.COMMA, TokenType.SEMICOLON])) {
-      if (modifiers.constKeyword == null &&
-          modifiers.finalKeyword == null &&
-          modifiers.varKeyword == null) {
-        _reportErrorForCurrentToken(
-            ParserErrorCode.MISSING_CONST_FINAL_VAR_OR_TYPE);
-      }
-      return new TopLevelVariableDeclaration(commentAndMetadata.comment,
-          commentAndMetadata.metadata, _parseVariableDeclarationListAfterType(
-              null, _validateModifiersForTopLevelVariable(modifiers), null),
-          _expect(TokenType.SEMICOLON));
-    }
-    TypeName returnType = parseReturnType();
-    if ((_matchesKeyword(Keyword.GET) || _matchesKeyword(Keyword.SET)) &&
-        _tokenMatchesIdentifier(_peek())) {
-      _validateModifiersForTopLevelFunction(modifiers);
-      return _parseFunctionDeclaration(
-          commentAndMetadata, modifiers.externalKeyword, returnType);
-    } else if (_matchesKeyword(Keyword.OPERATOR) && _isOperator(_peek())) {
-      _reportErrorForToken(ParserErrorCode.TOP_LEVEL_OPERATOR, _currentToken);
-      return _convertToFunctionDeclaration(_parseOperator(
-          commentAndMetadata, modifiers.externalKeyword, returnType));
-    } else if (_matches(TokenType.AT)) {
-      return new TopLevelVariableDeclaration(commentAndMetadata.comment,
-          commentAndMetadata.metadata, _parseVariableDeclarationListAfterType(
-              null, _validateModifiersForTopLevelVariable(modifiers),
-              returnType), _expect(TokenType.SEMICOLON));
-    } else if (!_matchesIdentifier()) {
-      // TODO(brianwilkerson) Generalize this error. We could also be parsing a
-      // top-level variable at this point.
-      _reportErrorForToken(ParserErrorCode.EXPECTED_EXECUTABLE, _currentToken);
-      Token semicolon;
-      if (_matches(TokenType.SEMICOLON)) {
-        semicolon = getAndAdvance();
-      } else {
-        semicolon = _createSyntheticToken(TokenType.SEMICOLON);
-      }
-      List<VariableDeclaration> variables = new List<VariableDeclaration>();
-      variables.add(
-          new VariableDeclaration(_createSyntheticIdentifier(), null, null));
-      return new TopLevelVariableDeclaration(commentAndMetadata.comment,
-          commentAndMetadata.metadata,
-          new VariableDeclarationList(null, null, null, returnType, variables),
-          semicolon);
-    }
-    if (_peek().matchesAny([
-      TokenType.OPEN_PAREN,
-      TokenType.FUNCTION,
-      TokenType.OPEN_CURLY_BRACKET
-    ])) {
-      _validateModifiersForTopLevelFunction(modifiers);
-      return _parseFunctionDeclaration(
-          commentAndMetadata, modifiers.externalKeyword, returnType);
-    }
-    return new TopLevelVariableDeclaration(commentAndMetadata.comment,
-        commentAndMetadata.metadata, _parseVariableDeclarationListAfterType(
-            null, _validateModifiersForTopLevelVariable(modifiers), returnType),
-        _expect(TokenType.SEMICOLON));
-  }
-
-  /**
-   * Parse a const expression. Return the const expression that was parsed.
-   *
-   *     constExpression ::=
-   *         instanceCreationExpression
-   *       | listLiteral
-   *       | mapLiteral
-   */
-  Expression _parseConstExpression() {
-    Token keyword = _expectKeyword(Keyword.CONST);
-    if (_matches(TokenType.OPEN_SQUARE_BRACKET) || _matches(TokenType.INDEX)) {
-      return _parseListLiteral(keyword, null);
-    } else if (_matches(TokenType.OPEN_CURLY_BRACKET)) {
-      return _parseMapLiteral(keyword, null);
-    } else if (_matches(TokenType.LT)) {
-      return _parseListOrMapLiteral(keyword);
-    }
-    return _parseInstanceCreationExpression(keyword);
-  }
-
-  ConstructorDeclaration _parseConstructor(
-      CommentAndMetadata commentAndMetadata, Token externalKeyword,
-      Token constKeyword, Token factoryKeyword, SimpleIdentifier returnType,
-      Token period, SimpleIdentifier name, FormalParameterList parameters) {
-    bool bodyAllowed = externalKeyword == null;
-    Token separator = null;
-    List<ConstructorInitializer> initializers = null;
-    if (_matches(TokenType.COLON)) {
-      separator = getAndAdvance();
-      initializers = new List<ConstructorInitializer>();
-      do {
-        if (_matchesKeyword(Keyword.THIS)) {
-          if (_tokenMatches(_peek(), TokenType.OPEN_PAREN)) {
-            bodyAllowed = false;
-            initializers.add(_parseRedirectingConstructorInvocation());
-          } else if (_tokenMatches(_peek(), TokenType.PERIOD) &&
-              _tokenMatches(_peekAt(3), TokenType.OPEN_PAREN)) {
-            bodyAllowed = false;
-            initializers.add(_parseRedirectingConstructorInvocation());
-          } else {
-            initializers.add(_parseConstructorFieldInitializer());
-          }
-        } else if (_matchesKeyword(Keyword.SUPER)) {
-          initializers.add(_parseSuperConstructorInvocation());
-        } else if (_matches(TokenType.OPEN_CURLY_BRACKET) ||
-            _matches(TokenType.FUNCTION)) {
-          _reportErrorForCurrentToken(ParserErrorCode.MISSING_INITIALIZER);
-        } else {
-          initializers.add(_parseConstructorFieldInitializer());
-        }
-      } while (_optional(TokenType.COMMA));
-      if (factoryKeyword != null) {
-        _reportErrorForToken(
-            ParserErrorCode.FACTORY_WITH_INITIALIZERS, factoryKeyword);
-      }
-    }
-    ConstructorName redirectedConstructor = null;
-    FunctionBody body;
-    if (_matches(TokenType.EQ)) {
-      separator = getAndAdvance();
-      redirectedConstructor = parseConstructorName();
-      body = new EmptyFunctionBody(_expect(TokenType.SEMICOLON));
-      if (factoryKeyword == null) {
-        _reportErrorForNode(
-            ParserErrorCode.REDIRECTION_IN_NON_FACTORY_CONSTRUCTOR,
-            redirectedConstructor);
-      }
-    } else {
-      body = _parseFunctionBody(
-          true, ParserErrorCode.MISSING_FUNCTION_BODY, false);
-      if (constKeyword != null &&
-          factoryKeyword != null &&
-          externalKeyword == null) {
-        _reportErrorForToken(ParserErrorCode.CONST_FACTORY, factoryKeyword);
-      } else if (body is EmptyFunctionBody) {
-        if (factoryKeyword != null &&
-            externalKeyword == null &&
-            _parseFunctionBodies) {
-          _reportErrorForToken(
-              ParserErrorCode.FACTORY_WITHOUT_BODY, factoryKeyword);
-        }
-      } else {
-        if (constKeyword != null) {
-          _reportErrorForNode(
-              ParserErrorCode.CONST_CONSTRUCTOR_WITH_BODY, body);
-        } else if (!bodyAllowed) {
-          _reportErrorForNode(
-              ParserErrorCode.EXTERNAL_CONSTRUCTOR_WITH_BODY, body);
-        }
-      }
-    }
-    return new ConstructorDeclaration(commentAndMetadata.comment,
-        commentAndMetadata.metadata, externalKeyword, constKeyword,
-        factoryKeyword, returnType, period, name, parameters, separator,
-        initializers, redirectedConstructor, body);
-  }
-
-  /**
-   * Parse a field initializer within a constructor. Return the field
-   * initializer that was parsed.
-   *
-   *     fieldInitializer:
-   *         ('this' '.')? identifier '=' conditionalExpression cascadeSection*
-   */
-  ConstructorFieldInitializer _parseConstructorFieldInitializer() {
-    Token keyword = null;
-    Token period = null;
-    if (_matchesKeyword(Keyword.THIS)) {
-      keyword = getAndAdvance();
-      period = _expect(TokenType.PERIOD);
-    }
-    SimpleIdentifier fieldName = parseSimpleIdentifier();
-    Token equals = null;
-    if (_matches(TokenType.EQ)) {
-      equals = getAndAdvance();
-    } else if (!_matchesKeyword(Keyword.THIS) &&
-        !_matchesKeyword(Keyword.SUPER) &&
-        !_matches(TokenType.OPEN_CURLY_BRACKET) &&
-        !_matches(TokenType.FUNCTION)) {
-      _reportErrorForCurrentToken(
-          ParserErrorCode.MISSING_ASSIGNMENT_IN_INITIALIZER);
-      equals = _createSyntheticToken(TokenType.EQ);
-    } else {
-      _reportErrorForCurrentToken(
-          ParserErrorCode.MISSING_ASSIGNMENT_IN_INITIALIZER);
-      return new ConstructorFieldInitializer(keyword, period, fieldName,
-          _createSyntheticToken(TokenType.EQ), _createSyntheticIdentifier());
-    }
-    bool wasInInitializer = _inInitializer;
-    _inInitializer = true;
-    try {
-      Expression expression = parseConditionalExpression();
-      TokenType tokenType = _currentToken.type;
-      if (tokenType == TokenType.PERIOD_PERIOD) {
-        List<Expression> cascadeSections = new List<Expression>();
-        while (tokenType == TokenType.PERIOD_PERIOD) {
-          Expression section = _parseCascadeSection();
-          if (section != null) {
-            cascadeSections.add(section);
-          }
-          tokenType = _currentToken.type;
-        }
-        expression = new CascadeExpression(expression, cascadeSections);
-      }
-      return new ConstructorFieldInitializer(
-          keyword, period, fieldName, equals, expression);
-    } finally {
-      _inInitializer = wasInInitializer;
-    }
-  }
-
-  /**
-   * Parse a continue statement. Return the continue statement that was parsed.
-   *
-   *     continueStatement ::=
-   *         'continue' identifier? ';'
-   */
-  Statement _parseContinueStatement() {
-    Token continueKeyword = _expectKeyword(Keyword.CONTINUE);
-    if (!_inLoop && !_inSwitch) {
-      _reportErrorForToken(
-          ParserErrorCode.CONTINUE_OUTSIDE_OF_LOOP, continueKeyword);
-    }
-    SimpleIdentifier label = null;
-    if (_matchesIdentifier()) {
-      label = parseSimpleIdentifier();
-    }
-    if (_inSwitch && !_inLoop && label == null) {
-      _reportErrorForToken(
-          ParserErrorCode.CONTINUE_WITHOUT_LABEL_IN_CASE, continueKeyword);
-    }
-    Token semicolon = _expect(TokenType.SEMICOLON);
-    return new ContinueStatement(continueKeyword, label, semicolon);
-  }
-
-  /**
-   * Parse a directive. The [commentAndMetadata] is the metadata to be
-   * associated with the directive. Return the directive that was parsed.
-   *
-   *     directive ::=
-   *         exportDirective
-   *       | libraryDirective
-   *       | importDirective
-   *       | partDirective
-   */
-  Directive _parseDirective(CommentAndMetadata commentAndMetadata) {
-    if (_matchesKeyword(Keyword.IMPORT)) {
-      return _parseImportDirective(commentAndMetadata);
-    } else if (_matchesKeyword(Keyword.EXPORT)) {
-      return _parseExportDirective(commentAndMetadata);
-    } else if (_matchesKeyword(Keyword.LIBRARY)) {
-      return _parseLibraryDirective(commentAndMetadata);
-    } else if (_matchesKeyword(Keyword.PART)) {
-      return _parsePartDirective(commentAndMetadata);
-    } else {
-      // Internal error: this method should not have been invoked if the current
-      // token was something other than one of the above.
-      throw new IllegalStateException(
-          "parseDirective invoked in an invalid state; currentToken = $_currentToken");
-    }
-  }
-
-  /**
-   * Parse the script tag and directives in a compilation unit until the first
-   * non-directive is encountered. Return the compilation unit that was parsed.
-   *
-   *     compilationUnit ::=
-   *         scriptTag? directive*
-   */
-  CompilationUnit _parseDirectives() {
-    Token firstToken = _currentToken;
-    ScriptTag scriptTag = null;
-    if (_matches(TokenType.SCRIPT_TAG)) {
-      scriptTag = new ScriptTag(getAndAdvance());
-    }
-    List<Directive> directives = new List<Directive>();
-    while (!_matches(TokenType.EOF)) {
-      CommentAndMetadata commentAndMetadata = _parseCommentAndMetadata();
-      if ((_matchesKeyword(Keyword.IMPORT) ||
-              _matchesKeyword(Keyword.EXPORT) ||
-              _matchesKeyword(Keyword.LIBRARY) ||
-              _matchesKeyword(Keyword.PART)) &&
-          !_tokenMatches(_peek(), TokenType.PERIOD) &&
-          !_tokenMatches(_peek(), TokenType.LT) &&
-          !_tokenMatches(_peek(), TokenType.OPEN_PAREN)) {
-        directives.add(_parseDirective(commentAndMetadata));
-      } else if (_matches(TokenType.SEMICOLON)) {
-        _advance();
-      } else {
-        while (!_matches(TokenType.EOF)) {
-          _advance();
-        }
-        return new CompilationUnit(firstToken, scriptTag, directives,
-            new List<CompilationUnitMember>(), _currentToken);
-      }
-    }
-    return new CompilationUnit(firstToken, scriptTag, directives,
-        new List<CompilationUnitMember>(), _currentToken);
-  }
-
-  /**
-   * Parse a documentation comment. Return the documentation comment that was
-   * parsed, or `null` if there was no comment.
-   *
-   *     documentationComment ::=
-   *         multiLineComment?
-   *       | singleLineComment*
-   */
-  Comment _parseDocumentationComment() {
-    List<DocumentationCommentToken> documentationTokens =
-        <DocumentationCommentToken>[];
-    CommentToken commentToken = _currentToken.precedingComments;
-    while (commentToken != null) {
-      if (commentToken is DocumentationCommentToken) {
-        if (documentationTokens.isNotEmpty) {
-          if (commentToken.type == TokenType.SINGLE_LINE_COMMENT) {
-            if (documentationTokens[0].type != TokenType.SINGLE_LINE_COMMENT) {
-              documentationTokens.clear();
-            }
-          } else {
-            documentationTokens.clear();
-          }
-        }
-        documentationTokens.add(commentToken);
-      }
-      commentToken = commentToken.next;
-    }
-    if (documentationTokens.isEmpty) {
-      return null;
-    }
-    List<CommentReference> references =
-        _parseCommentReferences(documentationTokens);
-    return Comment.createDocumentationCommentWithReferences(
-        documentationTokens, references);
-  }
-
-  /**
-   * Parse a do statement. Return the do statement that was parsed.
-   *
-   *     doStatement ::=
-   *         'do' statement 'while' '(' expression ')' ';'
-   */
-  Statement _parseDoStatement() {
-    bool wasInLoop = _inLoop;
-    _inLoop = true;
-    try {
-      Token doKeyword = _expectKeyword(Keyword.DO);
-      Statement body = parseStatement2();
-      Token whileKeyword = _expectKeyword(Keyword.WHILE);
-      Token leftParenthesis = _expect(TokenType.OPEN_PAREN);
-      Expression condition = parseExpression2();
-      Token rightParenthesis = _expect(TokenType.CLOSE_PAREN);
-      Token semicolon = _expect(TokenType.SEMICOLON);
-      return new DoStatement(doKeyword, body, whileKeyword, leftParenthesis,
-          condition, rightParenthesis, semicolon);
-    } finally {
-      _inLoop = wasInLoop;
-    }
-  }
-
-  /**
-   * Parse an empty statement. Return the empty statement that was parsed.
-   *
-   *     emptyStatement ::=
-   *         ';'
-   */
-  Statement _parseEmptyStatement() => new EmptyStatement(getAndAdvance());
-
-  EnumConstantDeclaration _parseEnumConstantDeclaration() {
-    CommentAndMetadata commentAndMetadata = _parseCommentAndMetadata();
-    SimpleIdentifier name;
-    if (_matchesIdentifier()) {
-      name = parseSimpleIdentifier();
-    } else {
-      name = _createSyntheticIdentifier();
-    }
-    if (commentAndMetadata.metadata.isNotEmpty) {
-      _reportErrorForNode(ParserErrorCode.ANNOTATION_ON_ENUM_CONSTANT,
-          commentAndMetadata.metadata[0]);
-    }
-    return new EnumConstantDeclaration(
-        commentAndMetadata.comment, commentAndMetadata.metadata, name);
-  }
-
-  /**
-   * Parse an enum declaration. The [commentAndMetadata] is the metadata to be
-   * associated with the member. Return the enum declaration that was parsed.
-   *
-   *     enumType ::=
-   *         metadata 'enum' id '{' id (',' id)* (',')? '}'
-   */
-  EnumDeclaration _parseEnumDeclaration(CommentAndMetadata commentAndMetadata) {
-    Token keyword = _expectKeyword(Keyword.ENUM);
-    SimpleIdentifier name = parseSimpleIdentifier();
-    Token leftBracket = null;
-    List<EnumConstantDeclaration> constants =
-        new List<EnumConstantDeclaration>();
-    Token rightBracket = null;
-    if (_matches(TokenType.OPEN_CURLY_BRACKET)) {
-      leftBracket = _expect(TokenType.OPEN_CURLY_BRACKET);
-      if (_matchesIdentifier() || _matches(TokenType.AT)) {
-        constants.add(_parseEnumConstantDeclaration());
-      } else if (_matches(TokenType.COMMA) &&
-          _tokenMatchesIdentifier(_peek())) {
-        constants.add(_parseEnumConstantDeclaration());
-        _reportErrorForCurrentToken(ParserErrorCode.MISSING_IDENTIFIER);
-      } else {
-        constants.add(_parseEnumConstantDeclaration());
-        _reportErrorForCurrentToken(ParserErrorCode.EMPTY_ENUM_BODY);
-      }
-      while (_optional(TokenType.COMMA)) {
-        if (_matches(TokenType.CLOSE_CURLY_BRACKET)) {
-          break;
-        }
-        constants.add(_parseEnumConstantDeclaration());
-      }
-      rightBracket = _expect(TokenType.CLOSE_CURLY_BRACKET);
-    } else {
-      leftBracket = _createSyntheticToken(TokenType.OPEN_CURLY_BRACKET);
-      rightBracket = _createSyntheticToken(TokenType.CLOSE_CURLY_BRACKET);
-      _reportErrorForCurrentToken(ParserErrorCode.MISSING_ENUM_BODY);
-    }
-    return new EnumDeclaration(commentAndMetadata.comment,
-        commentAndMetadata.metadata, keyword, name, leftBracket, constants,
-        rightBracket);
-  }
-
-  /**
-   * Parse an equality expression. Return the equality expression that was
-   * parsed.
-   *
-   *     equalityExpression ::=
-   *         relationalExpression (equalityOperator relationalExpression)?
-   *       | 'super' equalityOperator relationalExpression
-   */
-  Expression _parseEqualityExpression() {
-    Expression expression;
-    if (_matchesKeyword(Keyword.SUPER) &&
-        _currentToken.next.type.isEqualityOperator) {
-      expression = new SuperExpression(getAndAdvance());
-    } else {
-      expression = _parseRelationalExpression();
-    }
-    bool leftEqualityExpression = false;
-    while (_currentToken.type.isEqualityOperator) {
-      Token operator = getAndAdvance();
-      if (leftEqualityExpression) {
-        _reportErrorForNode(
-            ParserErrorCode.EQUALITY_CANNOT_BE_EQUALITY_OPERAND, expression);
-      }
-      expression = new BinaryExpression(
-          expression, operator, _parseRelationalExpression());
-      leftEqualityExpression = true;
-    }
-    return expression;
-  }
-
-  /**
-   * Parse an export directive. The [commentAndMetadata] is the metadata to be
-   * associated with the directive. Return the export directive that was parsed.
-   *
-   *     exportDirective ::=
-   *         metadata 'export' stringLiteral combinator*';'
-   */
-  ExportDirective _parseExportDirective(CommentAndMetadata commentAndMetadata) {
-    Token exportKeyword = _expectKeyword(Keyword.EXPORT);
-    StringLiteral libraryUri = _parseUri();
-    List<Combinator> combinators = _parseCombinators();
-    Token semicolon = _expectSemicolon();
-    return new ExportDirective(commentAndMetadata.comment,
-        commentAndMetadata.metadata, exportKeyword, libraryUri, combinators,
-        semicolon);
-  }
-
-  /**
-   * Parse a list of expressions. Return the expression that was parsed.
-   *
-   *     expressionList ::=
-   *         expression (',' expression)*
-   */
-  List<Expression> _parseExpressionList() {
-    List<Expression> expressions = new List<Expression>();
-    expressions.add(parseExpression2());
-    while (_optional(TokenType.COMMA)) {
-      expressions.add(parseExpression2());
-    }
-    return expressions;
-  }
-
-  /**
-   * Parse the 'final', 'const', 'var' or type preceding a variable declaration.
-   * The [optional] is `true` if the keyword and type are optional. Return the
-   * 'final', 'const', 'var' or type that was parsed.
-   *
-   *     finalConstVarOrType ::=
-   *         'final' type?
-   *       | 'const' type?
-   *       | 'var'
-   *       | type
-   */
-  FinalConstVarOrType _parseFinalConstVarOrType(bool optional) {
-    Token keyword = null;
-    TypeName type = null;
-    if (_matchesKeyword(Keyword.FINAL) || _matchesKeyword(Keyword.CONST)) {
-      keyword = getAndAdvance();
-      if (_isTypedIdentifier(_currentToken)) {
-        type = parseTypeName();
-      }
-    } else if (_matchesKeyword(Keyword.VAR)) {
-      keyword = getAndAdvance();
-    } else {
-      if (_isTypedIdentifier(_currentToken)) {
-        type = parseReturnType();
-      } else if (!optional) {
-        _reportErrorForCurrentToken(
-            ParserErrorCode.MISSING_CONST_FINAL_VAR_OR_TYPE);
-      }
-    }
-    return new FinalConstVarOrType(keyword, type);
-  }
-
-  /**
-   * Parse a formal parameter. At most one of `isOptional` and `isNamed` can be
-   * `true`. The [kind] is the kind of parameter being expected based on the
-   * presence or absence of group delimiters. Return the formal parameter that
-   * was parsed.
-   *
-   *     defaultFormalParameter ::=
-   *         normalFormalParameter ('=' expression)?
-   *
-   *     defaultNamedParameter ::=
-   *         normalFormalParameter (':' expression)?
-   */
-  FormalParameter _parseFormalParameter(ParameterKind kind) {
-    NormalFormalParameter parameter = parseNormalFormalParameter();
-    if (_matches(TokenType.EQ)) {
-      Token seperator = getAndAdvance();
-      Expression defaultValue = parseExpression2();
-      if (kind == ParameterKind.NAMED) {
-        _reportErrorForToken(
-            ParserErrorCode.WRONG_SEPARATOR_FOR_NAMED_PARAMETER, seperator);
-      } else if (kind == ParameterKind.REQUIRED) {
-        _reportErrorForNode(
-            ParserErrorCode.POSITIONAL_PARAMETER_OUTSIDE_GROUP, parameter);
-      }
-      return new DefaultFormalParameter(
-          parameter, kind, seperator, defaultValue);
-    } else if (_matches(TokenType.COLON)) {
-      Token seperator = getAndAdvance();
-      Expression defaultValue = parseExpression2();
-      if (kind == ParameterKind.POSITIONAL) {
-        _reportErrorForToken(
-            ParserErrorCode.WRONG_SEPARATOR_FOR_POSITIONAL_PARAMETER,
-            seperator);
-      } else if (kind == ParameterKind.REQUIRED) {
-        _reportErrorForNode(
-            ParserErrorCode.NAMED_PARAMETER_OUTSIDE_GROUP, parameter);
-      }
-      return new DefaultFormalParameter(
-          parameter, kind, seperator, defaultValue);
-    } else if (kind != ParameterKind.REQUIRED) {
-      return new DefaultFormalParameter(parameter, kind, null, null);
-    }
-    return parameter;
-  }
-
-  /**
-   * Parse a for statement. Return the for statement that was parsed.
-   *
-   *     forStatement ::=
-   *         'for' '(' forLoopParts ')' statement
-   *
-   *     forLoopParts ::=
-   *         forInitializerStatement expression? ';' expressionList?
-   *       | declaredIdentifier 'in' expression
-   *       | identifier 'in' expression
-   *
-   *     forInitializerStatement ::=
-   *         localVariableDeclaration ';'
-   *       | expression? ';'
-   */
-  Statement _parseForStatement() {
-    bool wasInLoop = _inLoop;
-    _inLoop = true;
-    try {
-      Token awaitKeyword = null;
-      if (_matchesString(_AWAIT)) {
-        awaitKeyword = getAndAdvance();
-      }
-      Token forKeyword = _expectKeyword(Keyword.FOR);
-      Token leftParenthesis = _expect(TokenType.OPEN_PAREN);
-      VariableDeclarationList variableList = null;
-      Expression initialization = null;
-      if (!_matches(TokenType.SEMICOLON)) {
-        CommentAndMetadata commentAndMetadata = _parseCommentAndMetadata();
-        if (_matchesIdentifier() &&
-            (_tokenMatchesKeyword(_peek(), Keyword.IN) ||
-                _tokenMatches(_peek(), TokenType.COLON))) {
-          List<VariableDeclaration> variables = new List<VariableDeclaration>();
-          SimpleIdentifier variableName = parseSimpleIdentifier();
-          variables.add(new VariableDeclaration(variableName, null, null));
-          variableList = new VariableDeclarationList(commentAndMetadata.comment,
-              commentAndMetadata.metadata, null, null, variables);
-        } else if (_isInitializedVariableDeclaration()) {
-          variableList =
-              _parseVariableDeclarationListAfterMetadata(commentAndMetadata);
-        } else {
-          initialization = parseExpression2();
-        }
-        if (_matchesKeyword(Keyword.IN) || _matches(TokenType.COLON)) {
-          if (_matches(TokenType.COLON)) {
-            _reportErrorForCurrentToken(ParserErrorCode.COLON_IN_PLACE_OF_IN);
-          }
-          DeclaredIdentifier loopVariable = null;
-          SimpleIdentifier identifier = null;
-          if (variableList == null) {
-            // We found: <expression> 'in'
-            _reportErrorForCurrentToken(
-                ParserErrorCode.MISSING_VARIABLE_IN_FOR_EACH);
-          } else {
-            NodeList<VariableDeclaration> variables = variableList.variables;
-            if (variables.length > 1) {
-              _reportErrorForCurrentToken(
-                  ParserErrorCode.MULTIPLE_VARIABLES_IN_FOR_EACH,
-                  [variables.length.toString()]);
-            }
-            VariableDeclaration variable = variables[0];
-            if (variable.initializer != null) {
-              _reportErrorForCurrentToken(
-                  ParserErrorCode.INITIALIZED_VARIABLE_IN_FOR_EACH);
-            }
-            Token keyword = variableList.keyword;
-            TypeName type = variableList.type;
-            if (keyword != null || type != null) {
-              loopVariable = new DeclaredIdentifier(commentAndMetadata.comment,
-                  commentAndMetadata.metadata, keyword, type, variable.name);
-            } else {
-              if (!commentAndMetadata.metadata.isEmpty) {
-                // TODO(jwren) metadata isn't allowed before the identifier in
-                // "identifier in expression", add warning if commentAndMetadata
-                // has content
-              }
-              identifier = variable.name;
-            }
-          }
-          Token inKeyword = getAndAdvance();
-          Expression iterator = parseExpression2();
-          Token rightParenthesis = _expect(TokenType.CLOSE_PAREN);
-          Statement body = parseStatement2();
-          if (loopVariable == null) {
-            return new ForEachStatement.withReference(awaitKeyword, forKeyword,
-                leftParenthesis, identifier, inKeyword, iterator,
-                rightParenthesis, body);
-          }
-          return new ForEachStatement.withDeclaration(awaitKeyword, forKeyword,
-              leftParenthesis, loopVariable, inKeyword, iterator,
-              rightParenthesis, body);
-        }
-      }
-      if (awaitKeyword != null) {
-        _reportErrorForToken(
-            ParserErrorCode.INVALID_AWAIT_IN_FOR, awaitKeyword);
-      }
-      Token leftSeparator = _expect(TokenType.SEMICOLON);
-      Expression condition = null;
-      if (!_matches(TokenType.SEMICOLON)) {
-        condition = parseExpression2();
-      }
-      Token rightSeparator = _expect(TokenType.SEMICOLON);
-      List<Expression> updaters = null;
-      if (!_matches(TokenType.CLOSE_PAREN)) {
-        updaters = _parseExpressionList();
-      }
-      Token rightParenthesis = _expect(TokenType.CLOSE_PAREN);
-      Statement body = parseStatement2();
-      return new ForStatement(forKeyword, leftParenthesis, variableList,
-          initialization, leftSeparator, condition, rightSeparator, updaters,
-          rightParenthesis, body);
-    } finally {
-      _inLoop = wasInLoop;
-    }
-  }
-
-  /**
-   * Parse a function body. The [mayBeEmpty] is `true` if the function body is
-   * allowed to be empty. The [emptyErrorCode] is the error code to report if
-   * function body expected, but not found. The [inExpression] is `true` if the
-   * function body is being parsed as part of an expression and therefore does
-   * not have a terminating semicolon. Return the function body that was parsed.
-   *
-   *     functionBody ::=
-   *         '=>' expression ';'
-   *       | block
-   *
-   *     functionExpressionBody ::=
-   *         '=>' expression
-   *       | block
-   */
-  FunctionBody _parseFunctionBody(
-      bool mayBeEmpty, ParserErrorCode emptyErrorCode, bool inExpression) {
-    bool wasInAsync = _inAsync;
-    bool wasInGenerator = _inGenerator;
-    bool wasInLoop = _inLoop;
-    bool wasInSwitch = _inSwitch;
-    _inAsync = false;
-    _inGenerator = false;
-    _inLoop = false;
-    _inSwitch = false;
-    try {
-      if (_matches(TokenType.SEMICOLON)) {
-        if (!mayBeEmpty) {
-          _reportErrorForCurrentToken(emptyErrorCode);
-        }
-        return new EmptyFunctionBody(getAndAdvance());
-      } else if (_matchesString(_NATIVE)) {
-        Token nativeToken = getAndAdvance();
-        StringLiteral stringLiteral = null;
-        if (_matches(TokenType.STRING)) {
-          stringLiteral = parseStringLiteral();
-        }
-        return new NativeFunctionBody(
-            nativeToken, stringLiteral, _expect(TokenType.SEMICOLON));
-      }
-      Token keyword = null;
-      Token star = null;
-      if (_matchesString(ASYNC)) {
-        keyword = getAndAdvance();
-        if (_matches(TokenType.STAR)) {
-          star = getAndAdvance();
-          _inGenerator = true;
-        }
-        _inAsync = true;
-      } else if (_matchesString(SYNC)) {
-        keyword = getAndAdvance();
-        if (_matches(TokenType.STAR)) {
-          star = getAndAdvance();
-          _inGenerator = true;
-        }
-      }
-      if (_matches(TokenType.FUNCTION)) {
-        if (keyword != null) {
-          if (!_tokenMatchesString(keyword, ASYNC)) {
-            _reportErrorForToken(ParserErrorCode.INVALID_SYNC, keyword);
-            keyword = null;
-          } else if (star != null) {
-            _reportErrorForToken(
-                ParserErrorCode.INVALID_STAR_AFTER_ASYNC, star);
-          }
-        }
-        Token functionDefinition = getAndAdvance();
-        if (_matchesKeyword(Keyword.RETURN)) {
-          _reportErrorForToken(ParserErrorCode.UNEXPECTED_TOKEN, _currentToken,
-              [_currentToken.lexeme]);
-          _advance();
-        }
-        Expression expression = parseExpression2();
-        Token semicolon = null;
-        if (!inExpression) {
-          semicolon = _expect(TokenType.SEMICOLON);
-        }
-        if (!_parseFunctionBodies) {
-          return new EmptyFunctionBody(
-              _createSyntheticToken(TokenType.SEMICOLON));
-        }
-        return new ExpressionFunctionBody(
-            keyword, functionDefinition, expression, semicolon);
-      } else if (_matches(TokenType.OPEN_CURLY_BRACKET)) {
-        if (keyword != null) {
-          if (_tokenMatchesString(keyword, SYNC) && star == null) {
-            _reportErrorForToken(
-                ParserErrorCode.MISSING_STAR_AFTER_SYNC, keyword);
-          }
-        }
-        if (!_parseFunctionBodies) {
-          _skipBlock();
-          return new EmptyFunctionBody(
-              _createSyntheticToken(TokenType.SEMICOLON));
-        }
-        return new BlockFunctionBody(keyword, star, parseBlock());
-      } else {
-        // Invalid function body
-        _reportErrorForCurrentToken(emptyErrorCode);
-        return new EmptyFunctionBody(
-            _createSyntheticToken(TokenType.SEMICOLON));
-      }
-    } finally {
-      _inAsync = wasInAsync;
-      _inGenerator = wasInGenerator;
-      _inLoop = wasInLoop;
-      _inSwitch = wasInSwitch;
-    }
-  }
-
-  /**
-   * Parse a function declaration. The [commentAndMetadata] is the documentation
-   * comment and metadata to be associated with the declaration. The
-   * [externalKeyword] is the 'external' keyword, or `null` if the function is
-   * not external. The [returnType] is the return type, or `null` if there is no
-   * return type. The [isStatement] is `true` if the function declaration is
-   * being parsed as a statement. Return the function declaration that was
-   * parsed.
-   *
-   *     functionDeclaration ::=
-   *         functionSignature functionBody
-   *       | returnType? getOrSet identifier formalParameterList functionBody
-   */
-  FunctionDeclaration _parseFunctionDeclaration(
-      CommentAndMetadata commentAndMetadata, Token externalKeyword,
-      TypeName returnType) {
-    Token keyword = null;
-    bool isGetter = false;
-    if (_matchesKeyword(Keyword.GET) &&
-        !_tokenMatches(_peek(), TokenType.OPEN_PAREN)) {
-      keyword = getAndAdvance();
-      isGetter = true;
-    } else if (_matchesKeyword(Keyword.SET) &&
-        !_tokenMatches(_peek(), TokenType.OPEN_PAREN)) {
-      keyword = getAndAdvance();
-    }
-    SimpleIdentifier name = parseSimpleIdentifier();
-    TypeParameterList typeParameters = null;
-    if (parseGenericMethods && _matches(TokenType.LT)) {
-      typeParameters = parseTypeParameterList();
-    }
-    FormalParameterList parameters = null;
-    if (!isGetter) {
-      if (_matches(TokenType.OPEN_PAREN)) {
-        parameters = parseFormalParameterList();
-        _validateFormalParameterList(parameters);
-      } else {
-        _reportErrorForCurrentToken(
-            ParserErrorCode.MISSING_FUNCTION_PARAMETERS);
-        parameters = new FormalParameterList(
-            _createSyntheticToken(TokenType.OPEN_PAREN), null, null, null,
-            _createSyntheticToken(TokenType.CLOSE_PAREN));
-      }
-    } else if (_matches(TokenType.OPEN_PAREN)) {
-      _reportErrorForCurrentToken(ParserErrorCode.GETTER_WITH_PARAMETERS);
-      parseFormalParameterList();
-    }
-    FunctionBody body;
-    if (externalKeyword == null) {
-      body = _parseFunctionBody(
-          false, ParserErrorCode.MISSING_FUNCTION_BODY, false);
-    } else {
-      body = new EmptyFunctionBody(_expect(TokenType.SEMICOLON));
-    }
-//        if (!isStatement && matches(TokenType.SEMICOLON)) {
-//          // TODO(brianwilkerson) Improve this error message.
-//          reportError(ParserErrorCode.UNEXPECTED_TOKEN, currentToken.getLexeme());
-//          advance();
-//        }
-    return new FunctionDeclaration(commentAndMetadata.comment,
-        commentAndMetadata.metadata, externalKeyword, returnType, keyword, name,
-        new FunctionExpression(typeParameters, parameters, body));
-  }
-
-  /**
-   * Parse a function declaration statement. Return the function declaration
-   * statement that was parsed.
-   *
-   *     functionDeclarationStatement ::=
-   *         functionSignature functionBody
-   */
-  Statement _parseFunctionDeclarationStatement() {
-    Modifiers modifiers = _parseModifiers();
-    _validateModifiersForFunctionDeclarationStatement(modifiers);
-    return _parseFunctionDeclarationStatementAfterReturnType(
-        _parseCommentAndMetadata(), _parseOptionalReturnType());
-  }
-
-  /**
-   * Parse a function declaration statement. The [commentAndMetadata] is the
-   * documentation comment and metadata to be associated with the declaration.
-   * The [returnType] is the return type, or `null` if there is no return type.
-   * Return the function declaration statement that was parsed.
-   *
-   *     functionDeclarationStatement ::=
-   *         functionSignature functionBody
-   */
-  Statement _parseFunctionDeclarationStatementAfterReturnType(
-      CommentAndMetadata commentAndMetadata, TypeName returnType) {
-    FunctionDeclaration declaration =
-        _parseFunctionDeclaration(commentAndMetadata, null, returnType);
-    Token propertyKeyword = declaration.propertyKeyword;
-    if (propertyKeyword != null) {
-      if ((propertyKeyword as KeywordToken).keyword == Keyword.GET) {
-        _reportErrorForToken(
-            ParserErrorCode.GETTER_IN_FUNCTION, propertyKeyword);
-      } else {
-        _reportErrorForToken(
-            ParserErrorCode.SETTER_IN_FUNCTION, propertyKeyword);
-      }
-    }
-    return new FunctionDeclarationStatement(declaration);
-  }
-
-  /**
-   * Parse a function type alias. The [commentAndMetadata] is the metadata to be
-   * associated with the member. The [keyword] is the token representing the
-   * 'typedef' keyword. Return the function type alias that was parsed.
-   *
-   *     functionTypeAlias ::=
-   *         functionPrefix typeParameterList? formalParameterList ';'
-   *
-   *     functionPrefix ::=
-   *         returnType? name
-   */
-  FunctionTypeAlias _parseFunctionTypeAlias(
-      CommentAndMetadata commentAndMetadata, Token keyword) {
-    TypeName returnType = null;
-    if (hasReturnTypeInTypeAlias) {
-      returnType = parseReturnType();
-    }
-    SimpleIdentifier name = parseSimpleIdentifier();
-    TypeParameterList typeParameters = null;
-    if (_matches(TokenType.LT)) {
-      typeParameters = parseTypeParameterList();
-    }
-    if (_matches(TokenType.SEMICOLON) || _matches(TokenType.EOF)) {
-      _reportErrorForCurrentToken(ParserErrorCode.MISSING_TYPEDEF_PARAMETERS);
-      FormalParameterList parameters = new FormalParameterList(
-          _createSyntheticToken(TokenType.OPEN_PAREN), null, null, null,
-          _createSyntheticToken(TokenType.CLOSE_PAREN));
-      Token semicolon = _expect(TokenType.SEMICOLON);
-      return new FunctionTypeAlias(commentAndMetadata.comment,
-          commentAndMetadata.metadata, keyword, returnType, name,
-          typeParameters, parameters, semicolon);
-    } else if (!_matches(TokenType.OPEN_PAREN)) {
-      _reportErrorForCurrentToken(ParserErrorCode.MISSING_TYPEDEF_PARAMETERS);
-      // TODO(brianwilkerson) Recover from this error. At the very least we
-      // should skip to the start of the next valid compilation unit member,
-      // allowing for the possibility of finding the typedef parameters before
-      // that point.
-      return new FunctionTypeAlias(commentAndMetadata.comment,
-          commentAndMetadata.metadata, keyword, returnType, name,
-          typeParameters, new FormalParameterList(
-              _createSyntheticToken(TokenType.OPEN_PAREN), null, null, null,
-              _createSyntheticToken(TokenType.CLOSE_PAREN)),
-          _createSyntheticToken(TokenType.SEMICOLON));
-    }
-    FormalParameterList parameters = parseFormalParameterList();
-    _validateFormalParameterList(parameters);
-    Token semicolon = _expect(TokenType.SEMICOLON);
-    return new FunctionTypeAlias(commentAndMetadata.comment,
-        commentAndMetadata.metadata, keyword, returnType, name, typeParameters,
-        parameters, semicolon);
-  }
-
-  /**
-   * Parse a getter. The [commentAndMetadata] is the documentation comment and
-   * metadata to be associated with the declaration. The externalKeyword] is the
-   * 'external' token. The staticKeyword] is the static keyword, or `null` if
-   * the getter is not static. The [returnType] the return type that has already
-   * been parsed, or `null` if there was no return type. Return the getter that
-   * was parsed.
-   *
-   *     getter ::=
-   *         getterSignature functionBody?
-   *
-   *     getterSignature ::=
-   *         'external'? 'static'? returnType? 'get' identifier
-   */
-  MethodDeclaration _parseGetter(CommentAndMetadata commentAndMetadata,
-      Token externalKeyword, Token staticKeyword, TypeName returnType) {
-    Token propertyKeyword = _expectKeyword(Keyword.GET);
-    SimpleIdentifier name = parseSimpleIdentifier();
-    if (_matches(TokenType.OPEN_PAREN) &&
-        _tokenMatches(_peek(), TokenType.CLOSE_PAREN)) {
-      _reportErrorForCurrentToken(ParserErrorCode.GETTER_WITH_PARAMETERS);
-      _advance();
-      _advance();
-    }
-    FunctionBody body = _parseFunctionBody(
-        externalKeyword != null || staticKeyword == null,
-        ParserErrorCode.STATIC_GETTER_WITHOUT_BODY, false);
-    if (externalKeyword != null && body is! EmptyFunctionBody) {
-      _reportErrorForCurrentToken(ParserErrorCode.EXTERNAL_GETTER_WITH_BODY);
-    }
-    return new MethodDeclaration(commentAndMetadata.comment,
-        commentAndMetadata.metadata, externalKeyword, staticKeyword, returnType,
-        propertyKeyword, null, name, null, null, body);
-  }
-
-  /**
-   * Parse a list of identifiers. Return the list of identifiers that were
-   * parsed.
-   *
-   *     identifierList ::=
-   *         identifier (',' identifier)*
-   */
-  List<SimpleIdentifier> _parseIdentifierList() {
-    List<SimpleIdentifier> identifiers = new List<SimpleIdentifier>();
-    identifiers.add(parseSimpleIdentifier());
-    while (_matches(TokenType.COMMA)) {
-      _advance();
-      identifiers.add(parseSimpleIdentifier());
-    }
-    return identifiers;
-  }
-
-  /**
-   * Parse an if statement. Return the if statement that was parsed.
-   *
-   *     ifStatement ::=
-   *         'if' '(' expression ')' statement ('else' statement)?
-   */
-  Statement _parseIfStatement() {
-    Token ifKeyword = _expectKeyword(Keyword.IF);
-    Token leftParenthesis = _expect(TokenType.OPEN_PAREN);
-    Expression condition = parseExpression2();
-    Token rightParenthesis = _expect(TokenType.CLOSE_PAREN);
-    Statement thenStatement = parseStatement2();
-    Token elseKeyword = null;
-    Statement elseStatement = null;
-    if (_matchesKeyword(Keyword.ELSE)) {
-      elseKeyword = getAndAdvance();
-      elseStatement = parseStatement2();
-    }
-    return new IfStatement(ifKeyword, leftParenthesis, condition,
-        rightParenthesis, thenStatement, elseKeyword, elseStatement);
-  }
-
-  /**
-   * Parse an import directive. The [commentAndMetadata] is the metadata to be
-   * associated with the directive. Return the import directive that was parsed.
-   *
-   *     importDirective ::=
-   *         metadata 'import' stringLiteral (deferred)? ('as' identifier)? combinator*';'
-   */
-  ImportDirective _parseImportDirective(CommentAndMetadata commentAndMetadata) {
-    Token importKeyword = _expectKeyword(Keyword.IMPORT);
-    StringLiteral libraryUri = _parseUri();
-    Token deferredToken = null;
-    Token asToken = null;
-    SimpleIdentifier prefix = null;
-    if (_matchesKeyword(Keyword.DEFERRED)) {
-      deferredToken = getAndAdvance();
-    }
-    if (_matchesKeyword(Keyword.AS)) {
-      asToken = getAndAdvance();
-      prefix = parseSimpleIdentifier();
-    } else if (deferredToken != null) {
-      _reportErrorForCurrentToken(
-          ParserErrorCode.MISSING_PREFIX_IN_DEFERRED_IMPORT);
-    } else if (!_matches(TokenType.SEMICOLON) &&
-        !_matchesString(_SHOW) &&
-        !_matchesString(_HIDE)) {
-      Token nextToken = _peek();
-      if (_tokenMatchesKeyword(nextToken, Keyword.AS) ||
-          _tokenMatchesString(nextToken, _SHOW) ||
-          _tokenMatchesString(nextToken, _HIDE)) {
-        _reportErrorForCurrentToken(
-            ParserErrorCode.UNEXPECTED_TOKEN, [_currentToken]);
-        _advance();
-        if (_matchesKeyword(Keyword.AS)) {
-          asToken = getAndAdvance();
-          prefix = parseSimpleIdentifier();
-        }
-      }
-    }
-    List<Combinator> combinators = _parseCombinators();
-    Token semicolon = _expectSemicolon();
-    return new ImportDirective(commentAndMetadata.comment,
-        commentAndMetadata.metadata, importKeyword, libraryUri, deferredToken,
-        asToken, prefix, combinators, semicolon);
-  }
-
-  /**
-   * Parse a list of initialized identifiers. The [commentAndMetadata] is the
-   * documentation comment and metadata to be associated with the declaration.
-   * The [staticKeyword] is the static keyword, or `null` if the getter is not
-   * static. The [keyword] is the token representing the 'final', 'const' or
-   * 'var' keyword, or `null` if there is no keyword. The [type] is the type
-   * that has already been parsed, or `null` if 'var' was provided. Return the
-   * getter that was parsed.
-   *
-   *     ?? ::=
-   *         'static'? ('var' | type) initializedIdentifierList ';'
-   *       | 'final' type? initializedIdentifierList ';'
-   *
-   *     initializedIdentifierList ::=
-   *         initializedIdentifier (',' initializedIdentifier)*
-   *
-   *     initializedIdentifier ::=
-   *         identifier ('=' expression)?
-   */
-  FieldDeclaration _parseInitializedIdentifierList(
-      CommentAndMetadata commentAndMetadata, Token staticKeyword, Token keyword,
-      TypeName type) {
-    VariableDeclarationList fieldList =
-        _parseVariableDeclarationListAfterType(null, keyword, type);
-    return new FieldDeclaration(commentAndMetadata.comment,
-        commentAndMetadata.metadata, staticKeyword, fieldList,
-        _expect(TokenType.SEMICOLON));
-  }
-
-  /**
-   * Parse an instance creation expression. The [keyword] is the 'new' or
-   * 'const' keyword that introduces the expression. Return the instance
-   * creation expression that was parsed.
-   *
-   *     instanceCreationExpression ::=
-   *         ('new' | 'const') type ('.' identifier)? argumentList
-   */
-  InstanceCreationExpression _parseInstanceCreationExpression(Token keyword) {
-    ConstructorName constructorName = parseConstructorName();
-    ArgumentList argumentList = parseArgumentList();
-    return new InstanceCreationExpression(
-        keyword, constructorName, argumentList);
-  }
-
-  /**
-   * Parse a library directive. The [commentAndMetadata] is the metadata to be
-   * associated with the directive. Return the library directive that was
-   * parsed.
-   *
-   *     libraryDirective ::=
-   *         metadata 'library' identifier ';'
-   */
-  LibraryDirective _parseLibraryDirective(
-      CommentAndMetadata commentAndMetadata) {
-    Token keyword = _expectKeyword(Keyword.LIBRARY);
-    LibraryIdentifier libraryName = _parseLibraryName(
-        ParserErrorCode.MISSING_NAME_IN_LIBRARY_DIRECTIVE, keyword);
-    Token semicolon = _expect(TokenType.SEMICOLON);
-    return new LibraryDirective(commentAndMetadata.comment,
-        commentAndMetadata.metadata, keyword, libraryName, semicolon);
-  }
-
-  /**
-   * Parse a library name. The [missingNameError] is the error code to be used
-   * if the library name is missing. The [missingNameToken] is the token
-   * associated with the error produced if the library name is missing. Return
-   * the library name that was parsed.
-   *
-   *     libraryName ::=
-   *         libraryIdentifier
-   */
-  LibraryIdentifier _parseLibraryName(
-      ParserErrorCode missingNameError, Token missingNameToken) {
-    if (_matchesIdentifier()) {
-      return parseLibraryIdentifier();
-    } else if (_matches(TokenType.STRING)) {
-      // TODO(brianwilkerson) Recovery: This should be extended to handle
-      // arbitrary tokens until we can find a token that can start a compilation
-      // unit member.
-      StringLiteral string = parseStringLiteral();
-      _reportErrorForNode(ParserErrorCode.NON_IDENTIFIER_LIBRARY_NAME, string);
-    } else {
-      _reportErrorForToken(missingNameError, missingNameToken);
-    }
-    List<SimpleIdentifier> components = new List<SimpleIdentifier>();
-    components.add(_createSyntheticIdentifier());
-    return new LibraryIdentifier(components);
-  }
-
-  /**
-   * Parse a list literal. The [modifier] is the 'const' modifier appearing
-   * before the literal, or `null` if there is no modifier. The [typeArguments]
-   * is the type arguments appearing before the literal, or `null` if there are
-   * no type arguments. Return the list literal that was parsed.
-   *
-   *     listLiteral ::=
-   *         'const'? typeArguments? '[' (expressionList ','?)? ']'
-   */
-  ListLiteral _parseListLiteral(
-      Token modifier, TypeArgumentList typeArguments) {
-    // may be empty list literal
-    if (_matches(TokenType.INDEX)) {
-      BeginToken leftBracket = _createToken(
-          _currentToken, TokenType.OPEN_SQUARE_BRACKET, isBegin: true);
-      Token rightBracket =
-          new Token(TokenType.CLOSE_SQUARE_BRACKET, _currentToken.offset + 1);
-      leftBracket.endToken = rightBracket;
-      rightBracket.setNext(_currentToken.next);
-      leftBracket.setNext(rightBracket);
-      _currentToken.previous.setNext(leftBracket);
-      _currentToken = _currentToken.next;
-      return new ListLiteral(
-          modifier, typeArguments, leftBracket, null, rightBracket);
-    }
-    // open
-    Token leftBracket = _expect(TokenType.OPEN_SQUARE_BRACKET);
-    if (_matches(TokenType.CLOSE_SQUARE_BRACKET)) {
-      return new ListLiteral(
-          modifier, typeArguments, leftBracket, null, getAndAdvance());
-    }
-    bool wasInInitializer = _inInitializer;
-    _inInitializer = false;
-    try {
-      List<Expression> elements = new List<Expression>();
-      elements.add(parseExpression2());
-      while (_optional(TokenType.COMMA)) {
-        if (_matches(TokenType.CLOSE_SQUARE_BRACKET)) {
-          return new ListLiteral(
-              modifier, typeArguments, leftBracket, elements, getAndAdvance());
-        }
-        elements.add(parseExpression2());
-      }
-      Token rightBracket = _expect(TokenType.CLOSE_SQUARE_BRACKET);
-      return new ListLiteral(
-          modifier, typeArguments, leftBracket, elements, rightBracket);
-    } finally {
-      _inInitializer = wasInInitializer;
-    }
-  }
-
-  /**
-   * Parse a list or map literal. The [modifier] is the 'const' modifier
-   * appearing before the literal, or `null` if there is no modifier. Return the
-   * list or map literal that was parsed.
-   *
-   *     listOrMapLiteral ::=
-   *         listLiteral
-   *       | mapLiteral
-   */
-  TypedLiteral _parseListOrMapLiteral(Token modifier) {
-    TypeArgumentList typeArguments = null;
-    if (_matches(TokenType.LT)) {
-      typeArguments = parseTypeArgumentList();
-    }
-    if (_matches(TokenType.OPEN_CURLY_BRACKET)) {
-      return _parseMapLiteral(modifier, typeArguments);
-    } else if (_matches(TokenType.OPEN_SQUARE_BRACKET) ||
-        _matches(TokenType.INDEX)) {
-      return _parseListLiteral(modifier, typeArguments);
-    }
-    _reportErrorForCurrentToken(ParserErrorCode.EXPECTED_LIST_OR_MAP_LITERAL);
-    return new ListLiteral(modifier, typeArguments,
-        _createSyntheticToken(TokenType.OPEN_SQUARE_BRACKET), null,
-        _createSyntheticToken(TokenType.CLOSE_SQUARE_BRACKET));
-  }
-
-  /**
-   * Parse a logical and expression. Return the logical and expression that was
-   * parsed.
-   *
-   *     logicalAndExpression ::=
-   *         equalityExpression ('&&' equalityExpression)*
-   */
-  Expression _parseLogicalAndExpression() {
-    Expression expression = _parseEqualityExpression();
-    while (_matches(TokenType.AMPERSAND_AMPERSAND)) {
-      Token operator = getAndAdvance();
-      expression = new BinaryExpression(
-          expression, operator, _parseEqualityExpression());
-    }
-    return expression;
-  }
-
-  /**
-   * Parse a map literal. The [modifier] is the 'const' modifier appearing
-   * before the literal, or `null` if there is no modifier. The [typeArguments]
-   * is the type arguments that were declared, or `null` if there are no type
-   * arguments. Return the map literal that was parsed.
-   *
-   *     mapLiteral ::=
-   *         'const'? typeArguments? '{' (mapLiteralEntry (',' mapLiteralEntry)* ','?)? '}'
-   */
-  MapLiteral _parseMapLiteral(Token modifier, TypeArgumentList typeArguments) {
-    Token leftBracket = _expect(TokenType.OPEN_CURLY_BRACKET);
-    List<MapLiteralEntry> entries = new List<MapLiteralEntry>();
-    if (_matches(TokenType.CLOSE_CURLY_BRACKET)) {
-      return new MapLiteral(
-          modifier, typeArguments, leftBracket, entries, getAndAdvance());
-    }
-    bool wasInInitializer = _inInitializer;
-    _inInitializer = false;
-    try {
-      entries.add(parseMapLiteralEntry());
-      while (_optional(TokenType.COMMA)) {
-        if (_matches(TokenType.CLOSE_CURLY_BRACKET)) {
-          return new MapLiteral(
-              modifier, typeArguments, leftBracket, entries, getAndAdvance());
-        }
-        entries.add(parseMapLiteralEntry());
-      }
-      Token rightBracket = _expect(TokenType.CLOSE_CURLY_BRACKET);
-      return new MapLiteral(
-          modifier, typeArguments, leftBracket, entries, rightBracket);
-    } finally {
-      _inInitializer = wasInInitializer;
-    }
-  }
-
-  /**
-   * Parse a method declaration. The [commentAndMetadata] is the documentation
-   * comment and metadata to be associated with the declaration. The
-   * [externalKeyword] is the 'external' token. The [staticKeyword] is the
-   * static keyword, or `null` if the getter is not static. The [returnType] is
-   * the return type of the method. The [name] is the name of the method. The
-   * [parameters] is the parameters to the method. Return the method declaration
-   * that was parsed.
-   *
-   *     functionDeclaration ::=
-   *         ('external' 'static'?)? functionSignature functionBody
-   *       | 'external'? functionSignature ';'
-   */
-  MethodDeclaration _parseMethodDeclarationAfterParameters(
-      CommentAndMetadata commentAndMetadata, Token externalKeyword,
-      Token staticKeyword, TypeName returnType, SimpleIdentifier name,
-      TypeParameterList typeParameters, FormalParameterList parameters) {
-    FunctionBody body = _parseFunctionBody(
-        externalKeyword != null || staticKeyword == null,
-        ParserErrorCode.MISSING_FUNCTION_BODY, false);
-    if (externalKeyword != null) {
-      if (body is! EmptyFunctionBody) {
-        _reportErrorForNode(ParserErrorCode.EXTERNAL_METHOD_WITH_BODY, body);
-      }
-    } else if (staticKeyword != null) {
-      if (body is EmptyFunctionBody && _parseFunctionBodies) {
-        _reportErrorForNode(ParserErrorCode.ABSTRACT_STATIC_METHOD, body);
-      }
-    }
-    return new MethodDeclaration(commentAndMetadata.comment,
-        commentAndMetadata.metadata, externalKeyword, staticKeyword, returnType,
-        null, null, name, typeParameters, parameters, body);
-  }
-
-  /**
-   * Parse a method declaration. The [commentAndMetadata] is the documentation
-   * comment and metadata to be associated with the declaration. The
-   * [externalKeyword] is the 'external' token. The [staticKeyword] is the
-   * static keyword, or `null` if the getter is not static. The [returnType] is
-   * the return type of the method. Return the method declaration that was
-   * parsed.
-   *
-   *     functionDeclaration ::=
-   *         'external'? 'static'? functionSignature functionBody
-   *       | 'external'? functionSignature ';'
-   */
-  MethodDeclaration _parseMethodDeclarationAfterReturnType(
-      CommentAndMetadata commentAndMetadata, Token externalKeyword,
-      Token staticKeyword, TypeName returnType) {
-    SimpleIdentifier methodName = parseSimpleIdentifier();
-    TypeParameterList typeParameters = null;
-    if (parseGenericMethods && _matches(TokenType.LT)) {
-      typeParameters = parseTypeParameterList();
-    }
-    FormalParameterList parameters;
-    if (!_matches(TokenType.OPEN_PAREN) &&
-        (_matches(TokenType.OPEN_CURLY_BRACKET) ||
-            _matches(TokenType.FUNCTION))) {
-      _reportErrorForToken(
-          ParserErrorCode.MISSING_METHOD_PARAMETERS, _currentToken.previous);
-      parameters = new FormalParameterList(
-          _createSyntheticToken(TokenType.OPEN_PAREN), null, null, null,
-          _createSyntheticToken(TokenType.CLOSE_PAREN));
-    } else {
-      parameters = parseFormalParameterList();
-    }
-    _validateFormalParameterList(parameters);
-    return _parseMethodDeclarationAfterParameters(commentAndMetadata,
-        externalKeyword, staticKeyword, returnType, methodName, typeParameters,
-        parameters);
-  }
-
-  /**
-   * Parse the modifiers preceding a declaration. This method allows the
-   * modifiers to appear in any order but does generate errors for duplicated
-   * modifiers. Checks for other problems, such as having the modifiers appear
-   * in the wrong order or specifying both 'const' and 'final', are reported in
-   * one of the methods whose name is prefixed with `validateModifiersFor`.
-   * Return the modifiers that were parsed.
-   *
-   *     modifiers ::=
-   *         ('abstract' | 'const' | 'external' | 'factory' | 'final' | 'static' | 'var')*
-   */
-  Modifiers _parseModifiers() {
-    Modifiers modifiers = new Modifiers();
-    bool progress = true;
-    while (progress) {
-      if (_tokenMatches(_peek(), TokenType.PERIOD) ||
-          _tokenMatches(_peek(), TokenType.LT) ||
-          _tokenMatches(_peek(), TokenType.OPEN_PAREN)) {
-        return modifiers;
-      }
-      if (_matchesKeyword(Keyword.ABSTRACT)) {
-        if (modifiers.abstractKeyword != null) {
-          _reportErrorForCurrentToken(
-              ParserErrorCode.DUPLICATED_MODIFIER, [_currentToken.lexeme]);
-          _advance();
-        } else {
-          modifiers.abstractKeyword = getAndAdvance();
-        }
-      } else if (_matchesKeyword(Keyword.CONST)) {
-        if (modifiers.constKeyword != null) {
-          _reportErrorForCurrentToken(
-              ParserErrorCode.DUPLICATED_MODIFIER, [_currentToken.lexeme]);
-          _advance();
-        } else {
-          modifiers.constKeyword = getAndAdvance();
-        }
-      } else if (_matchesKeyword(Keyword.EXTERNAL) &&
-          !_tokenMatches(_peek(), TokenType.PERIOD) &&
-          !_tokenMatches(_peek(), TokenType.LT)) {
-        if (modifiers.externalKeyword != null) {
-          _reportErrorForCurrentToken(
-              ParserErrorCode.DUPLICATED_MODIFIER, [_currentToken.lexeme]);
-          _advance();
-        } else {
-          modifiers.externalKeyword = getAndAdvance();
-        }
-      } else if (_matchesKeyword(Keyword.FACTORY) &&
-          !_tokenMatches(_peek(), TokenType.PERIOD) &&
-          !_tokenMatches(_peek(), TokenType.LT)) {
-        if (modifiers.factoryKeyword != null) {
-          _reportErrorForCurrentToken(
-              ParserErrorCode.DUPLICATED_MODIFIER, [_currentToken.lexeme]);
-          _advance();
-        } else {
-          modifiers.factoryKeyword = getAndAdvance();
-        }
-      } else if (_matchesKeyword(Keyword.FINAL)) {
-        if (modifiers.finalKeyword != null) {
-          _reportErrorForCurrentToken(
-              ParserErrorCode.DUPLICATED_MODIFIER, [_currentToken.lexeme]);
-          _advance();
-        } else {
-          modifiers.finalKeyword = getAndAdvance();
-        }
-      } else if (_matchesKeyword(Keyword.STATIC) &&
-          !_tokenMatches(_peek(), TokenType.PERIOD) &&
-          !_tokenMatches(_peek(), TokenType.LT)) {
-        if (modifiers.staticKeyword != null) {
-          _reportErrorForCurrentToken(
-              ParserErrorCode.DUPLICATED_MODIFIER, [_currentToken.lexeme]);
-          _advance();
-        } else {
-          modifiers.staticKeyword = getAndAdvance();
-        }
-      } else if (_matchesKeyword(Keyword.VAR)) {
-        if (modifiers.varKeyword != null) {
-          _reportErrorForCurrentToken(
-              ParserErrorCode.DUPLICATED_MODIFIER, [_currentToken.lexeme]);
-          _advance();
-        } else {
-          modifiers.varKeyword = getAndAdvance();
-        }
-      } else {
-        progress = false;
-      }
-    }
-    return modifiers;
-  }
-
-  /**
-   * Parse a multiplicative expression. Return the multiplicative expression
-   * that was parsed.
-   *
-   *     multiplicativeExpression ::=
-   *         unaryExpression (multiplicativeOperator unaryExpression)*
-   *       | 'super' (multiplicativeOperator unaryExpression)+
-   */
-  Expression _parseMultiplicativeExpression() {
-    Expression expression;
-    if (_matchesKeyword(Keyword.SUPER) &&
-        _currentToken.next.type.isMultiplicativeOperator) {
-      expression = new SuperExpression(getAndAdvance());
-    } else {
-      expression = _parseUnaryExpression();
-    }
-    while (_currentToken.type.isMultiplicativeOperator) {
-      Token operator = getAndAdvance();
-      expression =
-          new BinaryExpression(expression, operator, _parseUnaryExpression());
-    }
-    return expression;
-  }
-
-  /**
-   * Parse a class native clause. Return the native clause that was parsed.
-   *
-   *     classNativeClause ::=
-   *         'native' name
-   */
-  NativeClause _parseNativeClause() {
-    Token keyword = getAndAdvance();
-    StringLiteral name = parseStringLiteral();
-    return new NativeClause(keyword, name);
-  }
-
-  /**
-   * Parse a new expression. Return the new expression that was parsed.
-   *
-   *     newExpression ::=
-   *         instanceCreationExpression
-   */
-  InstanceCreationExpression _parseNewExpression() =>
-      _parseInstanceCreationExpression(_expectKeyword(Keyword.NEW));
-
-  /**
-   * Parse a non-labeled statement. Return the non-labeled statement that was
-   * parsed.
-   *
-   *     nonLabeledStatement ::=
-   *         block
-   *       | assertStatement
-   *       | breakStatement
-   *       | continueStatement
-   *       | doStatement
-   *       | forStatement
-   *       | ifStatement
-   *       | returnStatement
-   *       | switchStatement
-   *       | tryStatement
-   *       | whileStatement
-   *       | variableDeclarationList ';'
-   *       | expressionStatement
-   *       | functionSignature functionBody
-   */
-  Statement _parseNonLabeledStatement() {
-    // TODO(brianwilkerson) Pass the comment and metadata on where appropriate.
-    CommentAndMetadata commentAndMetadata = _parseCommentAndMetadata();
-    if (_matches(TokenType.OPEN_CURLY_BRACKET)) {
-      if (_tokenMatches(_peek(), TokenType.STRING)) {
-        Token afterString = _skipStringLiteral(_currentToken.next);
-        if (afterString != null && afterString.type == TokenType.COLON) {
-          return new ExpressionStatement(
-              parseExpression2(), _expect(TokenType.SEMICOLON));
-        }
-      }
-      return parseBlock();
-    } else if (_matches(TokenType.KEYWORD) &&
-        !(_currentToken as KeywordToken).keyword.isPseudoKeyword) {
-      Keyword keyword = (_currentToken as KeywordToken).keyword;
-      // TODO(jwren) compute some metrics to figure out a better order for this
-      // if-then sequence to optimize performance
-      if (keyword == Keyword.ASSERT) {
-        return _parseAssertStatement();
-      } else if (keyword == Keyword.BREAK) {
-        return _parseBreakStatement();
-      } else if (keyword == Keyword.CONTINUE) {
-        return _parseContinueStatement();
-      } else if (keyword == Keyword.DO) {
-        return _parseDoStatement();
-      } else if (keyword == Keyword.FOR) {
-        return _parseForStatement();
-      } else if (keyword == Keyword.IF) {
-        return _parseIfStatement();
-      } else if (keyword == Keyword.RETHROW) {
-        return new ExpressionStatement(
-            _parseRethrowExpression(), _expect(TokenType.SEMICOLON));
-      } else if (keyword == Keyword.RETURN) {
-        return _parseReturnStatement();
-      } else if (keyword == Keyword.SWITCH) {
-        return _parseSwitchStatement();
-      } else if (keyword == Keyword.THROW) {
-        return new ExpressionStatement(
-            _parseThrowExpression(), _expect(TokenType.SEMICOLON));
-      } else if (keyword == Keyword.TRY) {
-        return _parseTryStatement();
-      } else if (keyword == Keyword.WHILE) {
-        return _parseWhileStatement();
-      } else if (keyword == Keyword.VAR || keyword == Keyword.FINAL) {
-        return _parseVariableDeclarationStatementAfterMetadata(
-            commentAndMetadata);
-      } else if (keyword == Keyword.VOID) {
-        TypeName returnType = parseReturnType();
-        if (_matchesIdentifier() &&
-            _peek().matchesAny([
-          TokenType.OPEN_PAREN,
-          TokenType.OPEN_CURLY_BRACKET,
-          TokenType.FUNCTION
-        ])) {
-          return _parseFunctionDeclarationStatementAfterReturnType(
-              commentAndMetadata, returnType);
-        } else {
-          //
-          // We have found an error of some kind. Try to recover.
-          //
-          if (_matchesIdentifier()) {
-            if (_peek().matchesAny(
-                [TokenType.EQ, TokenType.COMMA, TokenType.SEMICOLON])) {
-              //
-              // We appear to have a variable declaration with a type of "void".
-              //
-              _reportErrorForNode(ParserErrorCode.VOID_VARIABLE, returnType);
-              return _parseVariableDeclarationStatementAfterMetadata(
-                  commentAndMetadata);
-            }
-          } else if (_matches(TokenType.CLOSE_CURLY_BRACKET)) {
-            //
-            // We appear to have found an incomplete statement at the end of a
-            // block. Parse it as a variable declaration.
-            //
-            return _parseVariableDeclarationStatementAfterType(
-                commentAndMetadata, null, returnType);
-          }
-          _reportErrorForCurrentToken(ParserErrorCode.MISSING_STATEMENT);
-          // TODO(brianwilkerson) Recover from this error.
-          return new EmptyStatement(_createSyntheticToken(TokenType.SEMICOLON));
-        }
-      } else if (keyword == Keyword.CONST) {
-        if (_peek().matchesAny([
-          TokenType.LT,
-          TokenType.OPEN_CURLY_BRACKET,
-          TokenType.OPEN_SQUARE_BRACKET,
-          TokenType.INDEX
-        ])) {
-          return new ExpressionStatement(
-              parseExpression2(), _expect(TokenType.SEMICOLON));
-        } else if (_tokenMatches(_peek(), TokenType.IDENTIFIER)) {
-          Token afterType = _skipTypeName(_peek());
-          if (afterType != null) {
-            if (_tokenMatches(afterType, TokenType.OPEN_PAREN) ||
-                (_tokenMatches(afterType, TokenType.PERIOD) &&
-                    _tokenMatches(afterType.next, TokenType.IDENTIFIER) &&
-                    _tokenMatches(afterType.next.next, TokenType.OPEN_PAREN))) {
-              return new ExpressionStatement(
-                  parseExpression2(), _expect(TokenType.SEMICOLON));
-            }
-          }
-        }
-        return _parseVariableDeclarationStatementAfterMetadata(
-            commentAndMetadata);
-      } else if (keyword == Keyword.NEW ||
-          keyword == Keyword.TRUE ||
-          keyword == Keyword.FALSE ||
-          keyword == Keyword.NULL ||
-          keyword == Keyword.SUPER ||
-          keyword == Keyword.THIS) {
-        return new ExpressionStatement(
-            parseExpression2(), _expect(TokenType.SEMICOLON));
-      } else {
-        //
-        // We have found an error of some kind. Try to recover.
-        //
-        _reportErrorForCurrentToken(ParserErrorCode.MISSING_STATEMENT);
-        return new EmptyStatement(_createSyntheticToken(TokenType.SEMICOLON));
-      }
-    } else if (_inGenerator && _matchesString(_YIELD)) {
-      return _parseYieldStatement();
-    } else if (_inAsync && _matchesString(_AWAIT)) {
-      if (_tokenMatchesKeyword(_peek(), Keyword.FOR)) {
-        return _parseForStatement();
-      }
-      return new ExpressionStatement(
-          parseExpression2(), _expect(TokenType.SEMICOLON));
-    } else if (_matchesString(_AWAIT) &&
-        _tokenMatchesKeyword(_peek(), Keyword.FOR)) {
-      Token awaitToken = _currentToken;
-      Statement statement = _parseForStatement();
-      if (statement is! ForStatement) {
-        _reportErrorForToken(
-            CompileTimeErrorCode.ASYNC_FOR_IN_WRONG_CONTEXT, awaitToken);
-      }
-      return statement;
-    } else if (_matches(TokenType.SEMICOLON)) {
-      return _parseEmptyStatement();
-    } else if (_isInitializedVariableDeclaration()) {
-      return _parseVariableDeclarationStatementAfterMetadata(
-          commentAndMetadata);
-    } else if (_isFunctionDeclaration()) {
-      return _parseFunctionDeclarationStatement();
-    } else if (_matches(TokenType.CLOSE_CURLY_BRACKET)) {
-      _reportErrorForCurrentToken(ParserErrorCode.MISSING_STATEMENT);
-      return new EmptyStatement(_createSyntheticToken(TokenType.SEMICOLON));
-    } else {
-      return new ExpressionStatement(parseExpression2(), _expectSemicolon());
-    }
-  }
-
-  /**
-   * Parse an operator declaration. The [commentAndMetadata] is the
-   * documentation comment and metadata to be associated with the declaration.
-   * The [externalKeyword] is the 'external' token. The [returnType] is the
-   * return type that has already been parsed, or `null` if there was no return
-   * type. Return the operator declaration that was parsed.
-   *
-   *     operatorDeclaration ::=
-   *         operatorSignature (';' | functionBody)
-   *
-   *     operatorSignature ::=
-   *         'external'? returnType? 'operator' operator formalParameterList
-   */
-  MethodDeclaration _parseOperator(CommentAndMetadata commentAndMetadata,
-      Token externalKeyword, TypeName returnType) {
-    Token operatorKeyword;
-    if (_matchesKeyword(Keyword.OPERATOR)) {
-      operatorKeyword = getAndAdvance();
-    } else {
-      _reportErrorForToken(
-          ParserErrorCode.MISSING_KEYWORD_OPERATOR, _currentToken);
-      operatorKeyword = _createSyntheticKeyword(Keyword.OPERATOR);
-    }
-    if (!_currentToken.isUserDefinableOperator) {
-      _reportErrorForCurrentToken(
-          ParserErrorCode.NON_USER_DEFINABLE_OPERATOR, [_currentToken.lexeme]);
-    }
-    SimpleIdentifier name = new SimpleIdentifier(getAndAdvance());
-    if (_matches(TokenType.EQ)) {
-      Token previous = _currentToken.previous;
-      if ((_tokenMatches(previous, TokenType.EQ_EQ) ||
-              _tokenMatches(previous, TokenType.BANG_EQ)) &&
-          _currentToken.offset == previous.offset + 2) {
-        _reportErrorForCurrentToken(ParserErrorCode.INVALID_OPERATOR,
-            ["${previous.lexeme}${_currentToken.lexeme}"]);
-        _advance();
-      }
-    }
-    FormalParameterList parameters = parseFormalParameterList();
-    _validateFormalParameterList(parameters);
-    FunctionBody body =
-        _parseFunctionBody(true, ParserErrorCode.MISSING_FUNCTION_BODY, false);
-    if (externalKeyword != null && body is! EmptyFunctionBody) {
-      _reportErrorForCurrentToken(ParserErrorCode.EXTERNAL_OPERATOR_WITH_BODY);
-    }
-    return new MethodDeclaration(commentAndMetadata.comment,
-        commentAndMetadata.metadata, externalKeyword, null, returnType, null,
-        operatorKeyword, name, null, parameters, body);
-  }
-
-  /**
-   * Parse a return type if one is given, otherwise return `null` without
-   * advancing. Return the return type that was parsed.
-   */
-  TypeName _parseOptionalReturnType() {
-    if (_matchesKeyword(Keyword.VOID)) {
-      return parseReturnType();
-    } else if (_matchesIdentifier() &&
-        !_matchesKeyword(Keyword.GET) &&
-        !_matchesKeyword(Keyword.SET) &&
-        !_matchesKeyword(Keyword.OPERATOR) &&
-        (_tokenMatchesIdentifier(_peek()) ||
-            _tokenMatches(_peek(), TokenType.LT))) {
-      return parseReturnType();
-    } else if (_matchesIdentifier() &&
-        _tokenMatches(_peek(), TokenType.PERIOD) &&
-        _tokenMatchesIdentifier(_peekAt(2)) &&
-        (_tokenMatchesIdentifier(_peekAt(3)) ||
-            _tokenMatches(_peekAt(3), TokenType.LT))) {
-      return parseReturnType();
-    }
-    return null;
-  }
-
-  /**
-   * Parse a part or part-of directive. The [commentAndMetadata] is the metadata
-   * to be associated with the directive. Return the part or part-of directive
-   * that was parsed.
-   *
-   *     partDirective ::=
-   *         metadata 'part' stringLiteral ';'
-   *
-   *     partOfDirective ::=
-   *         metadata 'part' 'of' identifier ';'
-   */
-  Directive _parsePartDirective(CommentAndMetadata commentAndMetadata) {
-    Token partKeyword = _expectKeyword(Keyword.PART);
-    if (_matchesString(_OF)) {
-      Token ofKeyword = getAndAdvance();
-      LibraryIdentifier libraryName = _parseLibraryName(
-          ParserErrorCode.MISSING_NAME_IN_PART_OF_DIRECTIVE, ofKeyword);
-      Token semicolon = _expect(TokenType.SEMICOLON);
-      return new PartOfDirective(commentAndMetadata.comment,
-          commentAndMetadata.metadata, partKeyword, ofKeyword, libraryName,
-          semicolon);
-    }
-    StringLiteral partUri = _parseUri();
-    Token semicolon = _expect(TokenType.SEMICOLON);
-    return new PartDirective(commentAndMetadata.comment,
-        commentAndMetadata.metadata, partKeyword, partUri, semicolon);
-  }
-
-  /**
-   * Parse a postfix expression. Return the postfix expression that was parsed.
-   *
-   *     postfixExpression ::=
-   *         assignableExpression postfixOperator
-   *       | primary selector*
-   *
-   *     selector ::=
-   *         assignableSelector
-   *       | argumentList
-   */
-  Expression _parsePostfixExpression() {
-    Expression operand = _parseAssignableExpression(true);
-    if (_matches(TokenType.OPEN_SQUARE_BRACKET) ||
-        _matches(TokenType.PERIOD) ||
-        _matches(TokenType.QUESTION_PERIOD) ||
-        _matches(TokenType.OPEN_PAREN) ||
-        (parseGenericMethods && _matches(TokenType.LT))) {
-      do {
-        if (_isLikelyParameterList()) {
-          TypeArgumentList typeArguments = null;
-          if (_matches(TokenType.LT)) {
-            typeArguments = parseTypeArgumentList();
-          }
-          ArgumentList argumentList = parseArgumentList();
-          if (operand is PropertyAccess) {
-            PropertyAccess access = operand as PropertyAccess;
-            operand = new MethodInvocation(access.target, access.operator,
-                access.propertyName, typeArguments, argumentList);
-          } else {
-            operand = new FunctionExpressionInvocation(
-                operand, typeArguments, argumentList);
-          }
-        } else {
-          operand = _parseAssignableSelector(operand, true);
-        }
-      } while (_matches(TokenType.OPEN_SQUARE_BRACKET) ||
-          _matches(TokenType.PERIOD) ||
-          _matches(TokenType.QUESTION_PERIOD) ||
-          _matches(TokenType.OPEN_PAREN));
-      return operand;
-    }
-    if (!_currentToken.type.isIncrementOperator) {
-      return operand;
-    }
-    _ensureAssignable(operand);
-    Token operator = getAndAdvance();
-    return new PostfixExpression(operand, operator);
-  }
-
-  /**
-   * Parse a primary expression. Return the primary expression that was parsed.
-   *
-   *     primary ::=
-   *         thisExpression
-   *       | 'super' unconditionalAssignableSelector
-   *       | functionExpression
-   *       | literal
-   *       | identifier
-   *       | newExpression
-   *       | constObjectExpression
-   *       | '(' expression ')'
-   *       | argumentDefinitionTest
-   *
-   *     literal ::=
-   *         nullLiteral
-   *       | booleanLiteral
-   *       | numericLiteral
-   *       | stringLiteral
-   *       | symbolLiteral
-   *       | mapLiteral
-   *       | listLiteral
-   */
-  Expression _parsePrimaryExpression() {
-    if (_matchesKeyword(Keyword.THIS)) {
-      return new ThisExpression(getAndAdvance());
-    } else if (_matchesKeyword(Keyword.SUPER)) {
-      // TODO(paulberry): verify with Gilad that "super" must be followed by
-      // unconditionalAssignableSelector in this case.
-      return _parseAssignableSelector(
-          new SuperExpression(getAndAdvance()), false, allowConditional: false);
-    } else if (_matchesKeyword(Keyword.NULL)) {
-      return new NullLiteral(getAndAdvance());
-    } else if (_matchesKeyword(Keyword.FALSE)) {
-      return new BooleanLiteral(getAndAdvance(), false);
-    } else if (_matchesKeyword(Keyword.TRUE)) {
-      return new BooleanLiteral(getAndAdvance(), true);
-    } else if (_matches(TokenType.DOUBLE)) {
-      Token token = getAndAdvance();
-      double value = 0.0;
-      try {
-        value = double.parse(token.lexeme);
-      } on FormatException {
-        // The invalid format should have been reported by the scanner.
-      }
-      return new DoubleLiteral(token, value);
-    } else if (_matches(TokenType.HEXADECIMAL)) {
-      Token token = getAndAdvance();
-      int value = null;
-      try {
-        value = int.parse(token.lexeme.substring(2), radix: 16);
-      } on FormatException {
-        // The invalid format should have been reported by the scanner.
-      }
-      return new IntegerLiteral(token, value);
-    } else if (_matches(TokenType.INT)) {
-      Token token = getAndAdvance();
-      int value = null;
-      try {
-        value = int.parse(token.lexeme);
-      } on FormatException {
-        // The invalid format should have been reported by the scanner.
-      }
-      return new IntegerLiteral(token, value);
-    } else if (_matches(TokenType.STRING)) {
-      return parseStringLiteral();
-    } else if (_matches(TokenType.OPEN_CURLY_BRACKET)) {
-      return _parseMapLiteral(null, null);
-    } else if (_matches(TokenType.OPEN_SQUARE_BRACKET) ||
-        _matches(TokenType.INDEX)) {
-      return _parseListLiteral(null, null);
-    } else if (_matchesIdentifier()) {
-      // TODO(brianwilkerson) The code below was an attempt to recover from an
-      // error case, but it needs to be applied as a recovery only after we
-      // know that parsing it as an identifier doesn't work. Leaving the code as
-      // a reminder of how to recover.
-//            if (isFunctionExpression(peek())) {
-//              //
-//              // Function expressions were allowed to have names at one point, but this is now illegal.
-//              //
-//              reportError(ParserErrorCode.NAMED_FUNCTION_EXPRESSION, getAndAdvance());
-//              return parseFunctionExpression();
-//            }
-      return parsePrefixedIdentifier();
-    } else if (_matchesKeyword(Keyword.NEW)) {
-      return _parseNewExpression();
-    } else if (_matchesKeyword(Keyword.CONST)) {
-      return _parseConstExpression();
-    } else if (_matches(TokenType.OPEN_PAREN)) {
-      if (_isFunctionExpression(_currentToken)) {
-        return parseFunctionExpression();
-      }
-      Token leftParenthesis = getAndAdvance();
-      bool wasInInitializer = _inInitializer;
-      _inInitializer = false;
-      try {
-        Expression expression = parseExpression2();
-        Token rightParenthesis = _expect(TokenType.CLOSE_PAREN);
-        return new ParenthesizedExpression(
-            leftParenthesis, expression, rightParenthesis);
-      } finally {
-        _inInitializer = wasInInitializer;
-      }
-    } else if (_matches(TokenType.LT)) {
-      return _parseListOrMapLiteral(null);
-    } else if (_matches(TokenType.QUESTION) &&
-        _tokenMatches(_peek(), TokenType.IDENTIFIER)) {
-      _reportErrorForCurrentToken(
-          ParserErrorCode.UNEXPECTED_TOKEN, [_currentToken.lexeme]);
-      _advance();
-      return _parsePrimaryExpression();
-    } else if (_matchesKeyword(Keyword.VOID)) {
-      //
-      // Recover from having a return type of "void" where a return type is not
-      // expected.
-      //
-      // TODO(brianwilkerson) Improve this error message.
-      _reportErrorForCurrentToken(
-          ParserErrorCode.UNEXPECTED_TOKEN, [_currentToken.lexeme]);
-      _advance();
-      return _parsePrimaryExpression();
-    } else if (_matches(TokenType.HASH)) {
-      return _parseSymbolLiteral();
-    } else {
-      _reportErrorForCurrentToken(ParserErrorCode.MISSING_IDENTIFIER);
-      return _createSyntheticIdentifier();
-    }
-  }
-
-  /**
-   * Parse a redirecting constructor invocation. Return the redirecting
-   * constructor invocation that was parsed.
-   *
-   *     redirectingConstructorInvocation ::=
-   *         'this' ('.' identifier)? arguments
-   */
-  RedirectingConstructorInvocation _parseRedirectingConstructorInvocation() {
-    Token keyword = _expectKeyword(Keyword.THIS);
-    Token period = null;
-    SimpleIdentifier constructorName = null;
-    if (_matches(TokenType.PERIOD)) {
-      period = getAndAdvance();
-      constructorName = parseSimpleIdentifier();
-    }
-    ArgumentList argumentList = parseArgumentList();
-    return new RedirectingConstructorInvocation(
-        keyword, period, constructorName, argumentList);
-  }
-
-  /**
-   * Parse a relational expression. Return the relational expression that was
-   * parsed.
-   *
-   *     relationalExpression ::=
-   *         bitwiseOrExpression ('is' '!'? type | 'as' type | relationalOperator bitwiseOrExpression)?
-   *       | 'super' relationalOperator bitwiseOrExpression
-   */
-  Expression _parseRelationalExpression() {
-    if (_matchesKeyword(Keyword.SUPER) &&
-        _currentToken.next.type.isRelationalOperator) {
-      Expression expression = new SuperExpression(getAndAdvance());
-      Token operator = getAndAdvance();
-      expression = new BinaryExpression(
-          expression, operator, parseBitwiseOrExpression());
-      return expression;
-    }
-    Expression expression = parseBitwiseOrExpression();
-    if (_matchesKeyword(Keyword.AS)) {
-      Token asOperator = getAndAdvance();
-      expression = new AsExpression(expression, asOperator, parseTypeName());
-    } else if (_matchesKeyword(Keyword.IS)) {
-      Token isOperator = getAndAdvance();
-      Token notOperator = null;
-      if (_matches(TokenType.BANG)) {
-        notOperator = getAndAdvance();
-      }
-      expression = new IsExpression(
-          expression, isOperator, notOperator, parseTypeName());
-    } else if (_currentToken.type.isRelationalOperator) {
-      Token operator = getAndAdvance();
-      expression = new BinaryExpression(
-          expression, operator, parseBitwiseOrExpression());
-    }
-    return expression;
-  }
-
-  /**
-   * Parse a rethrow expression. Return the rethrow expression that was parsed.
-   *
-   *     rethrowExpression ::=
-   *         'rethrow'
-   */
-  Expression _parseRethrowExpression() =>
-      new RethrowExpression(_expectKeyword(Keyword.RETHROW));
-
-  /**
-   * Parse a return statement. Return the return statement that was parsed.
-   *
-   *     returnStatement ::=
-   *         'return' expression? ';'
-   */
-  Statement _parseReturnStatement() {
-    Token returnKeyword = _expectKeyword(Keyword.RETURN);
-    if (_matches(TokenType.SEMICOLON)) {
-      return new ReturnStatement(returnKeyword, null, getAndAdvance());
-    }
-    Expression expression = parseExpression2();
-    Token semicolon = _expect(TokenType.SEMICOLON);
-    return new ReturnStatement(returnKeyword, expression, semicolon);
-  }
-
-  /**
-   * Parse a setter. The [commentAndMetadata] is the documentation comment and
-   * metadata to be associated with the declaration. The [externalKeyword] is
-   * the 'external' token. The [staticKeyword] is the static keyword, or `null`
-   * if the setter is not static. The [returnType] is the return type that has
-   * already been parsed, or `null` if there was no return type. Return the
-   * setter that was parsed.
-   *
-   *     setter ::=
-   *         setterSignature functionBody?
-   *
-   *     setterSignature ::=
-   *         'external'? 'static'? returnType? 'set' identifier formalParameterList
-   */
-  MethodDeclaration _parseSetter(CommentAndMetadata commentAndMetadata,
-      Token externalKeyword, Token staticKeyword, TypeName returnType) {
-    Token propertyKeyword = _expectKeyword(Keyword.SET);
-    SimpleIdentifier name = parseSimpleIdentifier();
-    FormalParameterList parameters = parseFormalParameterList();
-    _validateFormalParameterList(parameters);
-    FunctionBody body = _parseFunctionBody(
-        externalKeyword != null || staticKeyword == null,
-        ParserErrorCode.STATIC_SETTER_WITHOUT_BODY, false);
-    if (externalKeyword != null && body is! EmptyFunctionBody) {
-      _reportErrorForCurrentToken(ParserErrorCode.EXTERNAL_SETTER_WITH_BODY);
-    }
-    return new MethodDeclaration(commentAndMetadata.comment,
-        commentAndMetadata.metadata, externalKeyword, staticKeyword, returnType,
-        propertyKeyword, null, name, null, parameters, body);
-  }
-
-  /**
-   * Parse a shift expression. Return the shift expression that was parsed.
-   *
-   *     shiftExpression ::=
-   *         additiveExpression (shiftOperator additiveExpression)*
-   *       | 'super' (shiftOperator additiveExpression)+
-   */
-  Expression _parseShiftExpression() {
-    Expression expression;
-    if (_matchesKeyword(Keyword.SUPER) &&
-        _currentToken.next.type.isShiftOperator) {
-      expression = new SuperExpression(getAndAdvance());
-    } else {
-      expression = _parseAdditiveExpression();
-    }
-    while (_currentToken.type.isShiftOperator) {
-      Token operator = getAndAdvance();
-      expression = new BinaryExpression(
-          expression, operator, _parseAdditiveExpression());
-    }
-    return expression;
-  }
-
-  /**
-   * Parse a list of statements within a switch statement. Return the statements
-   * that were parsed.
-   *
-   *     statements ::=
-   *         statement*
-   */
-  List<Statement> _parseStatementList() {
-    List<Statement> statements = new List<Statement>();
-    Token statementStart = _currentToken;
-    while (!_matches(TokenType.EOF) &&
-        !_matches(TokenType.CLOSE_CURLY_BRACKET) &&
-        !_isSwitchMember()) {
-      statements.add(parseStatement2());
-      if (identical(_currentToken, statementStart)) {
-        _reportErrorForToken(ParserErrorCode.UNEXPECTED_TOKEN, _currentToken,
-            [_currentToken.lexeme]);
-        _advance();
-      }
-      statementStart = _currentToken;
-    }
-    return statements;
-  }
-
-  /**
-   * Parse a string literal that contains interpolations. Return the string
-   * literal that was parsed.
-   */
-  StringInterpolation _parseStringInterpolation(Token string) {
-    List<InterpolationElement> elements = new List<InterpolationElement>();
-    bool hasMore = _matches(TokenType.STRING_INTERPOLATION_EXPRESSION) ||
-        _matches(TokenType.STRING_INTERPOLATION_IDENTIFIER);
-    elements.add(new InterpolationString(
-        string, _computeStringValue(string.lexeme, true, !hasMore)));
-    while (hasMore) {
-      if (_matches(TokenType.STRING_INTERPOLATION_EXPRESSION)) {
-        Token openToken = getAndAdvance();
-        bool wasInInitializer = _inInitializer;
-        _inInitializer = false;
-        try {
-          Expression expression = parseExpression2();
-          Token rightBracket = _expect(TokenType.CLOSE_CURLY_BRACKET);
-          elements.add(
-              new InterpolationExpression(openToken, expression, rightBracket));
-        } finally {
-          _inInitializer = wasInInitializer;
-        }
-      } else {
-        Token openToken = getAndAdvance();
-        Expression expression = null;
-        if (_matchesKeyword(Keyword.THIS)) {
-          expression = new ThisExpression(getAndAdvance());
-        } else {
-          expression = parseSimpleIdentifier();
-        }
-        elements.add(new InterpolationExpression(openToken, expression, null));
-      }
-      if (_matches(TokenType.STRING)) {
-        string = getAndAdvance();
-        hasMore = _matches(TokenType.STRING_INTERPOLATION_EXPRESSION) ||
-            _matches(TokenType.STRING_INTERPOLATION_IDENTIFIER);
-        elements.add(new InterpolationString(
-            string, _computeStringValue(string.lexeme, false, !hasMore)));
-      } else {
-        hasMore = false;
-      }
-    }
-    return new StringInterpolation(elements);
-  }
-
-  /**
-   * Parse a super constructor invocation. Return the super constructor
-   * invocation that was parsed.
-   *
-   *     superConstructorInvocation ::=
-   *         'super' ('.' identifier)? arguments
-   */
-  SuperConstructorInvocation _parseSuperConstructorInvocation() {
-    Token keyword = _expectKeyword(Keyword.SUPER);
-    Token period = null;
-    SimpleIdentifier constructorName = null;
-    if (_matches(TokenType.PERIOD)) {
-      period = getAndAdvance();
-      constructorName = parseSimpleIdentifier();
-    }
-    ArgumentList argumentList = parseArgumentList();
-    return new SuperConstructorInvocation(
-        keyword, period, constructorName, argumentList);
-  }
-
-  /**
-   * Parse a switch statement. Return the switch statement that was parsed.
-   *
-   *     switchStatement ::=
-   *         'switch' '(' expression ')' '{' switchCase* defaultCase? '}'
-   *
-   *     switchCase ::=
-   *         label* ('case' expression ':') statements
-   *
-   *     defaultCase ::=
-   *         label* 'default' ':' statements
-   */
-  SwitchStatement _parseSwitchStatement() {
-    bool wasInSwitch = _inSwitch;
-    _inSwitch = true;
-    try {
-      HashSet<String> definedLabels = new HashSet<String>();
-      Token keyword = _expectKeyword(Keyword.SWITCH);
-      Token leftParenthesis = _expect(TokenType.OPEN_PAREN);
-      Expression expression = parseExpression2();
-      Token rightParenthesis = _expect(TokenType.CLOSE_PAREN);
-      Token leftBracket = _expect(TokenType.OPEN_CURLY_BRACKET);
-      Token defaultKeyword = null;
-      List<SwitchMember> members = new List<SwitchMember>();
-      while (!_matches(TokenType.EOF) &&
-          !_matches(TokenType.CLOSE_CURLY_BRACKET)) {
-        List<Label> labels = new List<Label>();
-        while (
-            _matchesIdentifier() && _tokenMatches(_peek(), TokenType.COLON)) {
-          SimpleIdentifier identifier = parseSimpleIdentifier();
-          String label = identifier.token.lexeme;
-          if (definedLabels.contains(label)) {
-            _reportErrorForToken(
-                ParserErrorCode.DUPLICATE_LABEL_IN_SWITCH_STATEMENT,
-                identifier.token, [label]);
-          } else {
-            definedLabels.add(label);
-          }
-          Token colon = _expect(TokenType.COLON);
-          labels.add(new Label(identifier, colon));
-        }
-        if (_matchesKeyword(Keyword.CASE)) {
-          Token caseKeyword = getAndAdvance();
-          Expression caseExpression = parseExpression2();
-          Token colon = _expect(TokenType.COLON);
-          members.add(new SwitchCase(labels, caseKeyword, caseExpression, colon,
-              _parseStatementList()));
-          if (defaultKeyword != null) {
-            _reportErrorForToken(
-                ParserErrorCode.SWITCH_HAS_CASE_AFTER_DEFAULT_CASE,
-                caseKeyword);
-          }
-        } else if (_matchesKeyword(Keyword.DEFAULT)) {
-          if (defaultKeyword != null) {
-            _reportErrorForToken(
-                ParserErrorCode.SWITCH_HAS_MULTIPLE_DEFAULT_CASES, _peek());
-          }
-          defaultKeyword = getAndAdvance();
-          Token colon = _expect(TokenType.COLON);
-          members.add(new SwitchDefault(
-              labels, defaultKeyword, colon, _parseStatementList()));
-        } else {
-          // We need to advance, otherwise we could end up in an infinite loop,
-          // but this could be a lot smarter about recovering from the error.
-          _reportErrorForCurrentToken(ParserErrorCode.EXPECTED_CASE_OR_DEFAULT);
-          while (!_matches(TokenType.EOF) &&
-              !_matches(TokenType.CLOSE_CURLY_BRACKET) &&
-              !_matchesKeyword(Keyword.CASE) &&
-              !_matchesKeyword(Keyword.DEFAULT)) {
-            _advance();
-          }
-        }
-      }
-      Token rightBracket = _expect(TokenType.CLOSE_CURLY_BRACKET);
-      return new SwitchStatement(keyword, leftParenthesis, expression,
-          rightParenthesis, leftBracket, members, rightBracket);
-    } finally {
-      _inSwitch = wasInSwitch;
-    }
-  }
-
-  /**
-   * Parse a symbol literal. Return the symbol literal that was parsed.
-   *
-   *     symbolLiteral ::=
-   *         '#' identifier ('.' identifier)*
-   */
-  SymbolLiteral _parseSymbolLiteral() {
-    Token poundSign = getAndAdvance();
-    List<Token> components = new List<Token>();
-    if (_matchesIdentifier()) {
-      components.add(getAndAdvance());
-      while (_matches(TokenType.PERIOD)) {
-        _advance();
-        if (_matchesIdentifier()) {
-          components.add(getAndAdvance());
-        } else {
-          _reportErrorForCurrentToken(ParserErrorCode.MISSING_IDENTIFIER);
-          components.add(_createSyntheticToken(TokenType.IDENTIFIER));
-          break;
-        }
-      }
-    } else if (_currentToken.isOperator) {
-      components.add(getAndAdvance());
-    } else if (_tokenMatchesKeyword(_currentToken, Keyword.VOID)) {
-      components.add(getAndAdvance());
-    } else {
-      _reportErrorForCurrentToken(ParserErrorCode.MISSING_IDENTIFIER);
-      components.add(_createSyntheticToken(TokenType.IDENTIFIER));
-    }
-    return new SymbolLiteral(poundSign, components);
-  }
-
-  /**
-   * Parse a throw expression. Return the throw expression that was parsed.
-   *
-   *     throwExpression ::=
-   *         'throw' expression
-   */
-  Expression _parseThrowExpression() {
-    Token keyword = _expectKeyword(Keyword.THROW);
-    if (_matches(TokenType.SEMICOLON) || _matches(TokenType.CLOSE_PAREN)) {
-      _reportErrorForToken(
-          ParserErrorCode.MISSING_EXPRESSION_IN_THROW, _currentToken);
-      return new ThrowExpression(keyword, _createSyntheticIdentifier());
-    }
-    Expression expression = parseExpression2();
-    return new ThrowExpression(keyword, expression);
-  }
-
-  /**
-   * Parse a throw expression. Return the throw expression that was parsed.
-   *
-   *     throwExpressionWithoutCascade ::=
-   *         'throw' expressionWithoutCascade
-   */
-  Expression _parseThrowExpressionWithoutCascade() {
-    Token keyword = _expectKeyword(Keyword.THROW);
-    if (_matches(TokenType.SEMICOLON) || _matches(TokenType.CLOSE_PAREN)) {
-      _reportErrorForToken(
-          ParserErrorCode.MISSING_EXPRESSION_IN_THROW, _currentToken);
-      return new ThrowExpression(keyword, _createSyntheticIdentifier());
-    }
-    Expression expression = parseExpressionWithoutCascade();
-    return new ThrowExpression(keyword, expression);
-  }
-
-  /**
-   * Parse a try statement. Return the try statement that was parsed.
-   *
-   *     tryStatement ::=
-   *         'try' block (onPart+ finallyPart? | finallyPart)
-   *
-   *     onPart ::=
-   *         catchPart block
-   *       | 'on' type catchPart? block
-   *
-   *     catchPart ::=
-   *         'catch' '(' identifier (',' identifier)? ')'
-   *
-   *     finallyPart ::=
-   *         'finally' block
-   */
-  Statement _parseTryStatement() {
-    Token tryKeyword = _expectKeyword(Keyword.TRY);
-    Block body = parseBlock();
-    List<CatchClause> catchClauses = new List<CatchClause>();
-    Block finallyClause = null;
-    while (_matchesString(_ON) || _matchesKeyword(Keyword.CATCH)) {
-      Token onKeyword = null;
-      TypeName exceptionType = null;
-      if (_matchesString(_ON)) {
-        onKeyword = getAndAdvance();
-        exceptionType = parseTypeName();
-      }
-      Token catchKeyword = null;
-      Token leftParenthesis = null;
-      SimpleIdentifier exceptionParameter = null;
-      Token comma = null;
-      SimpleIdentifier stackTraceParameter = null;
-      Token rightParenthesis = null;
-      if (_matchesKeyword(Keyword.CATCH)) {
-        catchKeyword = getAndAdvance();
-        leftParenthesis = _expect(TokenType.OPEN_PAREN);
-        exceptionParameter = parseSimpleIdentifier();
-        if (_matches(TokenType.COMMA)) {
-          comma = getAndAdvance();
-          stackTraceParameter = parseSimpleIdentifier();
-        }
-        rightParenthesis = _expect(TokenType.CLOSE_PAREN);
-      }
-      Block catchBody = parseBlock();
-      catchClauses.add(new CatchClause(onKeyword, exceptionType, catchKeyword,
-          leftParenthesis, exceptionParameter, comma, stackTraceParameter,
-          rightParenthesis, catchBody));
-    }
-    Token finallyKeyword = null;
-    if (_matchesKeyword(Keyword.FINALLY)) {
-      finallyKeyword = getAndAdvance();
-      finallyClause = parseBlock();
-    } else {
-      if (catchClauses.isEmpty) {
-        _reportErrorForCurrentToken(ParserErrorCode.MISSING_CATCH_OR_FINALLY);
-      }
-    }
-    return new TryStatement(
-        tryKeyword, body, catchClauses, finallyKeyword, finallyClause);
-  }
-
-  /**
-   * Parse a type alias. The [commentAndMetadata] is the metadata to be
-   * associated with the member. Return the type alias that was parsed.
-   *
-   *     typeAlias ::=
-   *         'typedef' typeAliasBody
-   *
-   *     typeAliasBody ::=
-   *         classTypeAlias
-   *       | functionTypeAlias
-   *
-   *     classTypeAlias ::=
-   *         identifier typeParameters? '=' 'abstract'? mixinApplication
-   *
-   *     mixinApplication ::=
-   *         qualified withClause implementsClause? ';'
-   *
-   *     functionTypeAlias ::=
-   *         functionPrefix typeParameterList? formalParameterList ';'
-   *
-   *     functionPrefix ::=
-   *         returnType? name
-   */
-  TypeAlias _parseTypeAlias(CommentAndMetadata commentAndMetadata) {
-    Token keyword = _expectKeyword(Keyword.TYPEDEF);
-    if (_matchesIdentifier()) {
-      Token next = _peek();
-      if (_tokenMatches(next, TokenType.LT)) {
-        next = _skipTypeParameterList(next);
-        if (next != null && _tokenMatches(next, TokenType.EQ)) {
-          TypeAlias typeAlias =
-              _parseClassTypeAlias(commentAndMetadata, null, keyword);
-          _reportErrorForToken(
-              ParserErrorCode.DEPRECATED_CLASS_TYPE_ALIAS, keyword);
-          return typeAlias;
-        }
-      } else if (_tokenMatches(next, TokenType.EQ)) {
-        TypeAlias typeAlias =
-            _parseClassTypeAlias(commentAndMetadata, null, keyword);
-        _reportErrorForToken(
-            ParserErrorCode.DEPRECATED_CLASS_TYPE_ALIAS, keyword);
-        return typeAlias;
-      }
-    }
-    return _parseFunctionTypeAlias(commentAndMetadata, keyword);
-  }
-
-  /**
-   * Parse a unary expression. Return the unary expression that was parsed.
-   *
-   *     unaryExpression ::=
-   *         prefixOperator unaryExpression
-   *       | awaitExpression
-   *       | postfixExpression
-   *       | unaryOperator 'super'
-   *       | '-' 'super'
-   *       | incrementOperator assignableExpression
-   */
-  Expression _parseUnaryExpression() {
-    if (_matches(TokenType.MINUS) ||
-        _matches(TokenType.BANG) ||
-        _matches(TokenType.TILDE)) {
-      Token operator = getAndAdvance();
-      if (_matchesKeyword(Keyword.SUPER)) {
-        if (_tokenMatches(_peek(), TokenType.OPEN_SQUARE_BRACKET) ||
-            _tokenMatches(_peek(), TokenType.PERIOD)) {
-          //     "prefixOperator unaryExpression"
-          // --> "prefixOperator postfixExpression"
-          // --> "prefixOperator primary                    selector*"
-          // --> "prefixOperator 'super' assignableSelector selector*"
-          return new PrefixExpression(operator, _parseUnaryExpression());
-        }
-        return new PrefixExpression(
-            operator, new SuperExpression(getAndAdvance()));
-      }
-      return new PrefixExpression(operator, _parseUnaryExpression());
-    } else if (_currentToken.type.isIncrementOperator) {
-      Token operator = getAndAdvance();
-      if (_matchesKeyword(Keyword.SUPER)) {
-        if (_tokenMatches(_peek(), TokenType.OPEN_SQUARE_BRACKET) ||
-            _tokenMatches(_peek(), TokenType.PERIOD)) {
-          // --> "prefixOperator 'super' assignableSelector selector*"
-          return new PrefixExpression(operator, _parseUnaryExpression());
-        }
-        //
-        // Even though it is not valid to use an incrementing operator
-        // ('++' or '--') before 'super', we can (and therefore must) interpret
-        // "--super" as semantically equivalent to "-(-super)". Unfortunately,
-        // we cannot do the same for "++super" because "+super" is also not
-        // valid.
-        //
-        if (operator.type == TokenType.MINUS_MINUS) {
-          Token firstOperator = _createToken(operator, TokenType.MINUS);
-          Token secondOperator =
-              new Token(TokenType.MINUS, operator.offset + 1);
-          secondOperator.setNext(_currentToken);
-          firstOperator.setNext(secondOperator);
-          operator.previous.setNext(firstOperator);
-          return new PrefixExpression(firstOperator, new PrefixExpression(
-              secondOperator, new SuperExpression(getAndAdvance())));
-        } else {
-          // Invalid operator before 'super'
-          _reportErrorForCurrentToken(
-              ParserErrorCode.INVALID_OPERATOR_FOR_SUPER, [operator.lexeme]);
-          return new PrefixExpression(
-              operator, new SuperExpression(getAndAdvance()));
-        }
-      }
-      return new PrefixExpression(operator, _parseAssignableExpression(false));
-    } else if (_matches(TokenType.PLUS)) {
-      _reportErrorForCurrentToken(ParserErrorCode.MISSING_IDENTIFIER);
-      return _createSyntheticIdentifier();
-    } else if (_inAsync && _matchesString(_AWAIT)) {
-      return _parseAwaitExpression();
-    }
-    return _parsePostfixExpression();
-  }
-
-  /**
-   * Parse a string literal representing a URI. Return the string literal that
-   * was parsed.
-   */
-  StringLiteral _parseUri() {
-    bool iskeywordAfterUri(Token token) => token.lexeme == Keyword.AS.syntax ||
-        token.lexeme == _HIDE ||
-        token.lexeme == _SHOW;
-    if (!_matches(TokenType.STRING) &&
-        !_matches(TokenType.SEMICOLON) &&
-        !iskeywordAfterUri(_currentToken)) {
-      // Attempt to recover in the case where the URI was not enclosed in
-      // quotes.
-      Token token = _currentToken;
-      while ((_tokenMatchesIdentifier(token) && !iskeywordAfterUri(token)) ||
-          _tokenMatches(token, TokenType.COLON) ||
-          _tokenMatches(token, TokenType.SLASH) ||
-          _tokenMatches(token, TokenType.PERIOD) ||
-          _tokenMatches(token, TokenType.PERIOD_PERIOD) ||
-          _tokenMatches(token, TokenType.PERIOD_PERIOD_PERIOD) ||
-          _tokenMatches(token, TokenType.INT) ||
-          _tokenMatches(token, TokenType.DOUBLE)) {
-        token = token.next;
-      }
-      if (_tokenMatches(token, TokenType.SEMICOLON) ||
-          iskeywordAfterUri(token)) {
-        Token endToken = token.previous;
-        token = _currentToken;
-        int endOffset = token.end;
-        StringBuffer buffer = new StringBuffer();
-        buffer.write(token.lexeme);
-        while (token != endToken) {
-          token = token.next;
-          if (token.offset != endOffset || token.precedingComments != null) {
-            return parseStringLiteral();
-          }
-          buffer.write(token.lexeme);
-          endOffset = token.end;
-        }
-        String value = buffer.toString();
-        Token newToken =
-            new StringToken(TokenType.STRING, "'$value'", _currentToken.offset);
-        _reportErrorForToken(
-            ParserErrorCode.NON_STRING_LITERAL_AS_URI, newToken);
-        _currentToken = endToken.next;
-        return new SimpleStringLiteral(newToken, value);
-      }
-    }
-    return parseStringLiteral();
-  }
-
-  /**
-   * Parse a variable declaration. Return the variable declaration that was
-   * parsed.
-   *
-   *     variableDeclaration ::=
-   *         identifier ('=' expression)?
-   */
-  VariableDeclaration _parseVariableDeclaration() {
-    // TODO(paulberry): prior to the fix for bug 23204, we permitted
-    // annotations before variable declarations (e.g. "String @deprecated s;").
-    // Although such constructions are prohibited by the spec, we may want to
-    // consider handling them anyway to allow for better parser recovery in the
-    // event that the user erroneously tries to use them.  However, as a
-    // counterargument, this would likely degrade parser recovery in the event
-    // of a construct like "class C { int @deprecated foo() {} }" (i.e. the
-    // user is in the middle of inserting "int bar;" prior to
-    // "@deprecated foo() {}").
-    SimpleIdentifier name = parseSimpleIdentifier();
-    Token equals = null;
-    Expression initializer = null;
-    if (_matches(TokenType.EQ)) {
-      equals = getAndAdvance();
-      initializer = parseExpression2();
-    }
-    return new VariableDeclaration(name, equals, initializer);
-  }
-
-  /**
-   * Parse a variable declaration list. The [commentAndMetadata] is the metadata
-   * to be associated with the variable declaration list. Return the variable
-   * declaration list that was parsed.
-   *
-   *     variableDeclarationList ::=
-   *         finalConstVarOrType variableDeclaration (',' variableDeclaration)*
-   */
-  VariableDeclarationList _parseVariableDeclarationListAfterMetadata(
-      CommentAndMetadata commentAndMetadata) {
-    FinalConstVarOrType holder = _parseFinalConstVarOrType(false);
-    return _parseVariableDeclarationListAfterType(
-        commentAndMetadata, holder.keyword, holder.type);
-  }
-
-  /**
-   * Parse a variable declaration list. The [commentAndMetadata] is the metadata
-   * to be associated with the variable declaration list, or `null` if there is
-   * no attempt at parsing the comment and metadata. The [keyword] is the token
-   * representing the 'final', 'const' or 'var' keyword, or `null` if there is
-   * no keyword. The [type] is the type of the variables in the list. Return the
-   * variable declaration list that was parsed.
-   *
-   *     variableDeclarationList ::=
-   *         finalConstVarOrType variableDeclaration (',' variableDeclaration)*
-   */
-  VariableDeclarationList _parseVariableDeclarationListAfterType(
-      CommentAndMetadata commentAndMetadata, Token keyword, TypeName type) {
-    if (type != null &&
-        keyword != null &&
-        _tokenMatchesKeyword(keyword, Keyword.VAR)) {
-      _reportErrorForToken(ParserErrorCode.VAR_AND_TYPE, keyword);
-    }
-    List<VariableDeclaration> variables = new List<VariableDeclaration>();
-    variables.add(_parseVariableDeclaration());
-    while (_matches(TokenType.COMMA)) {
-      _advance();
-      variables.add(_parseVariableDeclaration());
-    }
-    return new VariableDeclarationList(
-        commentAndMetadata != null ? commentAndMetadata.comment : null,
-        commentAndMetadata != null ? commentAndMetadata.metadata : null,
-        keyword, type, variables);
-  }
-
-  /**
-   * Parse a variable declaration statement. The [commentAndMetadata] is the
-   * metadata to be associated with the variable declaration statement, or
-   * `null` if there is no attempt at parsing the comment and metadata. Return
-   * the variable declaration statement that was parsed.
-   *
-   *     variableDeclarationStatement ::=
-   *         variableDeclarationList ';'
-   */
-  VariableDeclarationStatement _parseVariableDeclarationStatementAfterMetadata(
-      CommentAndMetadata commentAndMetadata) {
-    //    Token startToken = currentToken;
-    VariableDeclarationList variableList =
-        _parseVariableDeclarationListAfterMetadata(commentAndMetadata);
-//        if (!matches(TokenType.SEMICOLON)) {
-//          if (matches(startToken, Keyword.VAR) && isTypedIdentifier(startToken.getNext())) {
-//            // TODO(brianwilkerson) This appears to be of the form "var type variable". We should do
-//            // a better job of recovering in this case.
-//          }
-//        }
-    Token semicolon = _expect(TokenType.SEMICOLON);
-    return new VariableDeclarationStatement(variableList, semicolon);
-  }
-
-  /**
-   * Parse a variable declaration statement. The [commentAndMetadata] is the
-   * metadata to be associated with the variable declaration statement, or
-   * `null` if there is no attempt at parsing the comment and metadata. The
-   * [keyword] is the token representing the 'final', 'const' or 'var' keyword,
-   * or `null` if there is no keyword. The [type] is the type of the variables
-   * in the list. Return the variable declaration statement that was parsed.
-   *
-   *     variableDeclarationStatement ::=
-   *         variableDeclarationList ';'
-   */
-  VariableDeclarationStatement _parseVariableDeclarationStatementAfterType(
-      CommentAndMetadata commentAndMetadata, Token keyword, TypeName type) {
-    VariableDeclarationList variableList =
-        _parseVariableDeclarationListAfterType(
-            commentAndMetadata, keyword, type);
-    Token semicolon = _expect(TokenType.SEMICOLON);
-    return new VariableDeclarationStatement(variableList, semicolon);
-  }
-
-  /**
-   * Parse a while statement. Return the while statement that was parsed.
-   *
-   *     whileStatement ::=
-   *         'while' '(' expression ')' statement
-   */
-  Statement _parseWhileStatement() {
-    bool wasInLoop = _inLoop;
-    _inLoop = true;
-    try {
-      Token keyword = _expectKeyword(Keyword.WHILE);
-      Token leftParenthesis = _expect(TokenType.OPEN_PAREN);
-      Expression condition = parseExpression2();
-      Token rightParenthesis = _expect(TokenType.CLOSE_PAREN);
-      Statement body = parseStatement2();
-      return new WhileStatement(
-          keyword, leftParenthesis, condition, rightParenthesis, body);
-    } finally {
-      _inLoop = wasInLoop;
-    }
-  }
-
-  /**
-   * Parse a yield statement. Return the yield statement that was parsed.
-   *
-   *     yieldStatement ::=
-   *         'yield' '*'? expression ';'
-   */
-  YieldStatement _parseYieldStatement() {
-    Token yieldToken = getAndAdvance();
-    Token star = null;
-    if (_matches(TokenType.STAR)) {
-      star = getAndAdvance();
-    }
-    Expression expression = parseExpression2();
-    Token semicolon = _expect(TokenType.SEMICOLON);
-    return new YieldStatement(yieldToken, star, expression, semicolon);
-  }
-
-  /**
-   * Return the token that is immediately after the current token. This is
-   * equivalent to [_peekAt](1).
-   */
-  Token _peek() => _currentToken.next;
-
-  /**
-   * Return the token that is the given [distance] after the current token,
-   * where the distance is the number of tokens to look ahead. A distance of `0`
-   * is the current token, `1` is the next token, etc.
-   */
-  Token _peekAt(int distance) {
-    Token token = _currentToken;
-    for (int i = 0; i < distance; i++) {
-      token = token.next;
-    }
-    return token;
-  }
-
-  /**
-   * Report the given [error].
-   */
-  void _reportError(AnalysisError error) {
-    if (_errorListenerLock != 0) {
-      return;
-    }
-    _errorListener.onError(error);
-  }
-
-  /**
-   * Report an error with the given [errorCode] and [arguments] associated with
-   * the current token.
-   */
-  void _reportErrorForCurrentToken(ParserErrorCode errorCode,
-      [List<Object> arguments]) {
-    _reportErrorForToken(errorCode, _currentToken, arguments);
-  }
-
-  /**
-   * Report an error with the given [errorCode] and [arguments] associated with
-   * the given [node].
-   */
-  void _reportErrorForNode(ParserErrorCode errorCode, AstNode node,
-      [List<Object> arguments]) {
-    _reportError(new AnalysisError(
-        _source, node.offset, node.length, errorCode, arguments));
-  }
-
-  /**
-   * Report an error with the given [errorCode] and [arguments] associated with
-   * the given [token].
-   */
-  void _reportErrorForToken(ErrorCode errorCode, Token token,
-      [List<Object> arguments]) {
-    if (token.type == TokenType.EOF) {
-      token = token.previous;
-    }
-    _reportError(new AnalysisError(_source, token.offset,
-        math.max(token.length, 1), errorCode, arguments));
-  }
-
-  /**
-   * Skips a block with all containing blocks.
-   */
-  void _skipBlock() {
-    Token endToken = (_currentToken as BeginToken).endToken;
-    if (endToken == null) {
-      endToken = _currentToken.next;
-      while (!identical(endToken, _currentToken)) {
-        _currentToken = endToken;
-        endToken = _currentToken.next;
-      }
-      _reportErrorForToken(
-          ParserErrorCode.EXPECTED_TOKEN, _currentToken.previous, ["}"]);
-    } else {
-      _currentToken = endToken.next;
-    }
-  }
-
-  /**
-   * Parse the 'final', 'const', 'var' or type preceding a variable declaration,
-   * starting at the given token, without actually creating a type or changing
-   * the current token. Return the token following the type that was parsed, or
-   * `null` if the given token is not the first token in a valid type. The
-   * [startToken] is the token at which parsing is to begin. Return the token
-   * following the type that was parsed.
-   *
-   * finalConstVarOrType ::=
-   *   | 'final' type?
-   *   | 'const' type?
-   *   | 'var'
-   *   | type
-   */
-  Token _skipFinalConstVarOrType(Token startToken) {
-    if (_tokenMatchesKeyword(startToken, Keyword.FINAL) ||
-        _tokenMatchesKeyword(startToken, Keyword.CONST)) {
-      Token next = startToken.next;
-      if (_tokenMatchesIdentifier(next)) {
-        Token next2 = next.next;
-        // "Type parameter" or "Type<" or "prefix.Type"
-        if (_tokenMatchesIdentifier(next2) ||
-            _tokenMatches(next2, TokenType.LT) ||
-            _tokenMatches(next2, TokenType.PERIOD)) {
-          return _skipTypeName(next);
-        }
-        // "parameter"
-        return next;
-      }
-    } else if (_tokenMatchesKeyword(startToken, Keyword.VAR)) {
-      return startToken.next;
-    } else if (_tokenMatchesIdentifier(startToken)) {
-      Token next = startToken.next;
-      if (_tokenMatchesIdentifier(next) ||
-          _tokenMatches(next, TokenType.LT) ||
-          _tokenMatchesKeyword(next, Keyword.THIS) ||
-          (_tokenMatches(next, TokenType.PERIOD) &&
-              _tokenMatchesIdentifier(next.next) &&
-              (_tokenMatchesIdentifier(next.next.next) ||
-                  _tokenMatches(next.next.next, TokenType.LT) ||
-                  _tokenMatchesKeyword(next.next.next, Keyword.THIS)))) {
-        return _skipReturnType(startToken);
-      }
-    }
-    return null;
-  }
-
-  /**
-   * Parse a list of formal parameters, starting at the [startToken], without
-   * actually creating a formal parameter list or changing the current token.
-   * Return the token following the formal parameter list that was parsed, or
-   * `null` if the given token is not the first token in a valid list of formal
-   * parameter.
-   *
-   * Note that unlike other skip methods, this method uses a heuristic. In the
-   * worst case, the parameters could be prefixed by metadata, which would
-   * require us to be able to skip arbitrary expressions. Rather than duplicate
-   * the logic of most of the parse methods we simply look for something that is
-   * likely to be a list of parameters and then skip to returning the token
-   * after the closing parenthesis.
-   *
-   * This method must be kept in sync with [parseFormalParameterList].
-   *
-   *     formalParameterList ::=
-   *         '(' ')'
-   *       | '(' normalFormalParameters (',' optionalFormalParameters)? ')'
-   *       | '(' optionalFormalParameters ')'
-   *
-   *     normalFormalParameters ::=
-   *         normalFormalParameter (',' normalFormalParameter)*
-   *
-   *     optionalFormalParameters ::=
-   *         optionalPositionalFormalParameters
-   *       | namedFormalParameters
-   *
-   *     optionalPositionalFormalParameters ::=
-   *         '[' defaultFormalParameter (',' defaultFormalParameter)* ']'
-   *
-   *     namedFormalParameters ::=
-   *         '{' defaultNamedParameter (',' defaultNamedParameter)* '}'
-   */
-  Token _skipFormalParameterList(Token startToken) {
-    if (!_tokenMatches(startToken, TokenType.OPEN_PAREN)) {
-      return null;
-    }
-    Token next = startToken.next;
-    if (_tokenMatches(next, TokenType.CLOSE_PAREN)) {
-      return next.next;
-    }
-    //
-    // Look to see whether the token after the open parenthesis is something
-    // that should only occur at the beginning of a parameter list.
-    //
-    if (next.matchesAny([
-      TokenType.AT,
-      TokenType.OPEN_SQUARE_BRACKET,
-      TokenType.OPEN_CURLY_BRACKET
-    ]) ||
-        _tokenMatchesKeyword(next, Keyword.VOID) ||
-        (_tokenMatchesIdentifier(next) &&
-            (next.next.matchesAny([TokenType.COMMA, TokenType.CLOSE_PAREN])))) {
-      return _skipPastMatchingToken(startToken);
-    }
-    //
-    // Look to see whether the first parameter is a function typed parameter
-    // without a return type.
-    //
-    if (_tokenMatchesIdentifier(next) &&
-        _tokenMatches(next.next, TokenType.OPEN_PAREN)) {
-      Token afterParameters = _skipFormalParameterList(next.next);
-      if (afterParameters != null &&
-          (afterParameters
-              .matchesAny([TokenType.COMMA, TokenType.CLOSE_PAREN]))) {
-        return _skipPastMatchingToken(startToken);
-      }
-    }
-    //
-    // Look to see whether the first parameter has a type or is a function typed
-    // parameter with a return type.
-    //
-    Token afterType = _skipFinalConstVarOrType(next);
-    if (afterType == null) {
-      return null;
-    }
-    if (_skipSimpleIdentifier(afterType) == null) {
-      return null;
-    }
-    return _skipPastMatchingToken(startToken);
-  }
-
-  /**
-   * If the [startToken] is a begin token with an associated end token, then
-   * return the token following the end token. Otherwise, return `null`.
-   */
-  Token _skipPastMatchingToken(Token startToken) {
-    if (startToken is! BeginToken) {
-      return null;
-    }
-    Token closeParen = (startToken as BeginToken).endToken;
-    if (closeParen == null) {
-      return null;
-    }
-    return closeParen.next;
-  }
-
-  /**
-   * Parse a prefixed identifier, starting at the [startToken], without actually
-   * creating a prefixed identifier or changing the current token. Return the
-   * token following the prefixed identifier that was parsed, or `null` if the
-   * given token is not the first token in a valid prefixed identifier.
-   *
-   * This method must be kept in sync with [parsePrefixedIdentifier].
-   *
-   *     prefixedIdentifier ::=
-   *         identifier ('.' identifier)?
-   */
-  Token _skipPrefixedIdentifier(Token startToken) {
-    Token token = _skipSimpleIdentifier(startToken);
-    if (token == null) {
-      return null;
-    } else if (!_tokenMatches(token, TokenType.PERIOD)) {
-      return token;
-    }
-    token = token.next;
-    Token nextToken = _skipSimpleIdentifier(token);
-    if (nextToken != null) {
-      return nextToken;
-    } else if (_tokenMatches(token, TokenType.CLOSE_PAREN) ||
-        _tokenMatches(token, TokenType.COMMA)) {
-      // If the `id.` is followed by something that cannot produce a valid
-      // structure then assume this is a prefixed identifier but missing the
-      // trailing identifier
-      return token;
-    }
-    return null;
-  }
-
-  /**
-   * Parse a return type, starting at the [startToken], without actually
-   * creating a return type or changing the current token. Return the token
-   * following the return type that was parsed, or `null` if the given token is
-   * not the first token in a valid return type.
-   *
-   * This method must be kept in sync with [parseReturnType].
-   *
-   *     returnType ::=
-   *         'void'
-   *       | type
-   */
-  Token _skipReturnType(Token startToken) {
-    if (_tokenMatchesKeyword(startToken, Keyword.VOID)) {
-      return startToken.next;
-    } else {
-      return _skipTypeName(startToken);
-    }
-  }
-
-  /**
-   * Parse a simple identifier, starting at the [startToken], without actually
-   * creating a simple identifier or changing the current token. Return the
-   * token following the simple identifier that was parsed, or `null` if the
-   * given token is not the first token in a valid simple identifier.
-   *
-   * This method must be kept in sync with [parseSimpleIdentifier].
-   *
-   *     identifier ::=
-   *         IDENTIFIER
-   */
-  Token _skipSimpleIdentifier(Token startToken) {
-    if (_tokenMatches(startToken, TokenType.IDENTIFIER) ||
-        (_tokenMatches(startToken, TokenType.KEYWORD) &&
-            (startToken as KeywordToken).keyword.isPseudoKeyword)) {
-      return startToken.next;
-    }
-    return null;
-  }
-
-  /**
-   * Parse a string literal that contains interpolations, starting at the
-   * [startToken], without actually creating a string literal or changing the
-   * current token. Return the token following the string literal that was
-   * parsed, or `null` if the given token is not the first token in a valid
-   * string literal.
-   *
-   * This method must be kept in sync with [parseStringInterpolation].
-   */
-  Token _skipStringInterpolation(Token startToken) {
-    Token token = startToken;
-    TokenType type = token.type;
-    while (type == TokenType.STRING_INTERPOLATION_EXPRESSION ||
-        type == TokenType.STRING_INTERPOLATION_IDENTIFIER) {
-      if (type == TokenType.STRING_INTERPOLATION_EXPRESSION) {
-        token = token.next;
-        type = token.type;
-        //
-        // Rather than verify that the following tokens represent a valid
-        // expression, we simply skip tokens until we reach the end of the
-        // interpolation, being careful to handle nested string literals.
-        //
-        int bracketNestingLevel = 1;
-        while (bracketNestingLevel > 0) {
-          if (type == TokenType.EOF) {
-            return null;
-          } else if (type == TokenType.OPEN_CURLY_BRACKET) {
-            bracketNestingLevel++;
-          } else if (type == TokenType.CLOSE_CURLY_BRACKET) {
-            bracketNestingLevel--;
-          } else if (type == TokenType.STRING) {
-            token = _skipStringLiteral(token);
-            if (token == null) {
-              return null;
-            }
-          } else {
-            token = token.next;
-          }
-          type = token.type;
-        }
-        token = token.next;
-        type = token.type;
-      } else {
-        token = token.next;
-        if (token.type != TokenType.IDENTIFIER) {
-          return null;
-        }
-        token = token.next;
-      }
-      type = token.type;
-      if (type == TokenType.STRING) {
-        token = token.next;
-        type = token.type;
-      }
-    }
-    return token;
-  }
-
-  /**
-   * Parse a string literal, starting at the [startToken], without actually
-   * creating a string literal or changing the current token. Return the token
-   * following the string literal that was parsed, or `null` if the given token
-   * is not the first token in a valid string literal.
-   *
-   * This method must be kept in sync with [parseStringLiteral].
-   *
-   *     stringLiteral ::=
-   *         MULTI_LINE_STRING+
-   *       | SINGLE_LINE_STRING+
-   */
-  Token _skipStringLiteral(Token startToken) {
-    Token token = startToken;
-    while (token != null && _tokenMatches(token, TokenType.STRING)) {
-      token = token.next;
-      TokenType type = token.type;
-      if (type == TokenType.STRING_INTERPOLATION_EXPRESSION ||
-          type == TokenType.STRING_INTERPOLATION_IDENTIFIER) {
-        token = _skipStringInterpolation(token);
-      }
-    }
-    if (identical(token, startToken)) {
-      return null;
-    }
-    return token;
-  }
-
-  /**
-   * Parse a list of type arguments, starting at the [startToken], without
-   * actually creating a type argument list or changing the current token.
-   * Return the token following the type argument list that was parsed, or
-   * `null` if the given token is not the first token in a valid type argument
-   * list.
-   *
-   * This method must be kept in sync with [parseTypeArgumentList].
-   *
-   *     typeArguments ::=
-   *         '<' typeList '>'
-   *
-   *     typeList ::=
-   *         type (',' type)*
-   */
-  Token _skipTypeArgumentList(Token startToken) {
-    Token token = startToken;
-    if (!_tokenMatches(token, TokenType.LT)) {
-      return null;
-    }
-    token = _skipTypeName(token.next);
-    if (token == null) {
-      // If the start token '<' is followed by '>'
-      // then assume this should be type argument list but is missing a type
-      token = startToken.next;
-      if (_tokenMatches(token, TokenType.GT)) {
-        return token.next;
-      }
-      return null;
-    }
-    while (_tokenMatches(token, TokenType.COMMA)) {
-      token = _skipTypeName(token.next);
-      if (token == null) {
-        return null;
-      }
-    }
-    if (token.type == TokenType.GT) {
-      return token.next;
-    } else if (token.type == TokenType.GT_GT) {
-      Token second = new Token(TokenType.GT, token.offset + 1);
-      second.setNextWithoutSettingPrevious(token.next);
-      return second;
-    }
-    return null;
-  }
-
-  /**
-   * Parse a type name, starting at the [startToken], without actually creating
-   * a type name or changing the current token. Return the token following the
-   * type name that was parsed, or `null` if the given token is not the first
-   * token in a valid type name.
-   *
-   * This method must be kept in sync with [parseTypeName].
-   *
-   *     type ::=
-   *         qualified typeArguments?
-   */
-  Token _skipTypeName(Token startToken) {
-    Token token = _skipPrefixedIdentifier(startToken);
-    if (token == null) {
-      return null;
-    }
-    if (_tokenMatches(token, TokenType.LT)) {
-      token = _skipTypeArgumentList(token);
-    }
-    return token;
-  }
-
-  /**
-   * Parse a list of type parameters, starting at the [startToken], without
-   * actually creating a type parameter list or changing the current token.
-   * Return the token following the type parameter list that was parsed, or
-   * `null` if the given token is not the first token in a valid type parameter
-   * list.
-   *
-   * This method must be kept in sync with [parseTypeParameterList].
-   *
-   *     typeParameterList ::=
-   *         '<' typeParameter (',' typeParameter)* '>'
-   */
-  Token _skipTypeParameterList(Token startToken) {
-    if (!_tokenMatches(startToken, TokenType.LT)) {
-      return null;
-    }
-    //
-    // We can't skip a type parameter because it can be preceeded by metadata,
-    // so we just assume that everything before the matching end token is valid.
-    //
-    int depth = 1;
-    Token next = startToken.next;
-    while (depth > 0) {
-      if (_tokenMatches(next, TokenType.EOF)) {
-        return null;
-      } else if (_tokenMatches(next, TokenType.LT)) {
-        depth++;
-      } else if (_tokenMatches(next, TokenType.GT)) {
-        depth--;
-      } else if (_tokenMatches(next, TokenType.GT_EQ)) {
-        if (depth == 1) {
-          Token fakeEquals = new Token(TokenType.EQ, next.offset + 2);
-          fakeEquals.setNextWithoutSettingPrevious(next.next);
-          return fakeEquals;
-        }
-        depth--;
-      } else if (_tokenMatches(next, TokenType.GT_GT)) {
-        depth -= 2;
-      } else if (_tokenMatches(next, TokenType.GT_GT_EQ)) {
-        if (depth < 2) {
-          return null;
-        } else if (depth == 2) {
-          Token fakeEquals = new Token(TokenType.EQ, next.offset + 2);
-          fakeEquals.setNextWithoutSettingPrevious(next.next);
-          return fakeEquals;
-        }
-        depth -= 2;
-      }
-      next = next.next;
-    }
-    return next;
-  }
-
-  /**
-   * Return `true` if the given [token] has the given [type].
-   */
-  bool _tokenMatches(Token token, TokenType type) => token.type == type;
-
-  /**
-   * Return `true` if the given [token] is a valid identifier. Valid identifiers
-   * include built-in identifiers (pseudo-keywords).
-   */
-  bool _tokenMatchesIdentifier(Token token) =>
-      _tokenMatches(token, TokenType.IDENTIFIER) ||
-          (_tokenMatches(token, TokenType.KEYWORD) &&
-              (token as KeywordToken).keyword.isPseudoKeyword);
-
-  /**
-   * Return `true` if the given [token] matches the given [keyword].
-   */
-  bool _tokenMatchesKeyword(Token token, Keyword keyword) =>
-      token.type == TokenType.KEYWORD &&
-          (token as KeywordToken).keyword == keyword;
-
-  /**
-   * Return `true` if the given [token] matches the given [identifier].
-   */
-  bool _tokenMatchesString(Token token, String identifier) =>
-      token.type == TokenType.IDENTIFIER && token.lexeme == identifier;
-
-  /**
-   * Translate the characters at the given [index] in the given [lexeme],
-   * appending the translated character to the given [buffer]. The index is
-   * assumed to be valid.
-   */
-  int _translateCharacter(StringBuffer buffer, String lexeme, int index) {
-    int currentChar = lexeme.codeUnitAt(index);
-    if (currentChar != 0x5C) {
-      buffer.writeCharCode(currentChar);
-      return index + 1;
-    }
-    //
-    // We have found an escape sequence, so we parse the string to determine
-    // what kind of escape sequence and what character to add to the builder.
-    //
-    int length = lexeme.length;
-    int currentIndex = index + 1;
-    if (currentIndex >= length) {
-      // Illegal escape sequence: no char after escape.
-      // This cannot actually happen because it would require the escape
-      // character to be the last character in the string, but if it were it
-      // would escape the closing quote, leaving the string unclosed.
-      // reportError(ParserErrorCode.MISSING_CHAR_IN_ESCAPE_SEQUENCE);
-      return length;
-    }
-    currentChar = lexeme.codeUnitAt(currentIndex);
-    if (currentChar == 0x6E) {
-      buffer.writeCharCode(0xA);
-      // newline
-    } else if (currentChar == 0x72) {
-      buffer.writeCharCode(0xD);
-      // carriage return
-    } else if (currentChar == 0x66) {
-      buffer.writeCharCode(0xC);
-      // form feed
-    } else if (currentChar == 0x62) {
-      buffer.writeCharCode(0x8);
-      // backspace
-    } else if (currentChar == 0x74) {
-      buffer.writeCharCode(0x9);
-      // tab
-    } else if (currentChar == 0x76) {
-      buffer.writeCharCode(0xB);
-      // vertical tab
-    } else if (currentChar == 0x78) {
-      if (currentIndex + 2 >= length) {
-        // Illegal escape sequence: not enough hex digits
-        _reportErrorForCurrentToken(ParserErrorCode.INVALID_HEX_ESCAPE);
-        return length;
-      }
-      int firstDigit = lexeme.codeUnitAt(currentIndex + 1);
-      int secondDigit = lexeme.codeUnitAt(currentIndex + 2);
-      if (!_isHexDigit(firstDigit) || !_isHexDigit(secondDigit)) {
-        // Illegal escape sequence: invalid hex digit
-        _reportErrorForCurrentToken(ParserErrorCode.INVALID_HEX_ESCAPE);
-      } else {
-        int charCode = (Character.digit(firstDigit, 16) << 4) +
-            Character.digit(secondDigit, 16);
-        buffer.writeCharCode(charCode);
-      }
-      return currentIndex + 3;
-    } else if (currentChar == 0x75) {
-      currentIndex++;
-      if (currentIndex >= length) {
-        // Illegal escape sequence: not enough hex digits
-        _reportErrorForCurrentToken(ParserErrorCode.INVALID_UNICODE_ESCAPE);
-        return length;
-      }
-      currentChar = lexeme.codeUnitAt(currentIndex);
-      if (currentChar == 0x7B) {
-        currentIndex++;
-        if (currentIndex >= length) {
-          // Illegal escape sequence: incomplete escape
-          _reportErrorForCurrentToken(ParserErrorCode.INVALID_UNICODE_ESCAPE);
-          return length;
-        }
-        currentChar = lexeme.codeUnitAt(currentIndex);
-        int digitCount = 0;
-        int value = 0;
-        while (currentChar != 0x7D) {
-          if (!_isHexDigit(currentChar)) {
-            // Illegal escape sequence: invalid hex digit
-            _reportErrorForCurrentToken(ParserErrorCode.INVALID_UNICODE_ESCAPE);
-            currentIndex++;
-            while (currentIndex < length &&
-                lexeme.codeUnitAt(currentIndex) != 0x7D) {
-              currentIndex++;
-            }
-            return currentIndex + 1;
-          }
-          digitCount++;
-          value = (value << 4) + Character.digit(currentChar, 16);
-          currentIndex++;
-          if (currentIndex >= length) {
-            // Illegal escape sequence: incomplete escape
-            _reportErrorForCurrentToken(ParserErrorCode.INVALID_UNICODE_ESCAPE);
-            return length;
-          }
-          currentChar = lexeme.codeUnitAt(currentIndex);
-        }
-        if (digitCount < 1 || digitCount > 6) {
-          // Illegal escape sequence: not enough or too many hex digits
-          _reportErrorForCurrentToken(ParserErrorCode.INVALID_UNICODE_ESCAPE);
-        }
-        _appendScalarValue(buffer, lexeme.substring(index, currentIndex + 1),
-            value, index, currentIndex);
-        return currentIndex + 1;
-      } else {
-        if (currentIndex + 3 >= length) {
-          // Illegal escape sequence: not enough hex digits
-          _reportErrorForCurrentToken(ParserErrorCode.INVALID_UNICODE_ESCAPE);
-          return length;
-        }
-        int firstDigit = currentChar;
-        int secondDigit = lexeme.codeUnitAt(currentIndex + 1);
-        int thirdDigit = lexeme.codeUnitAt(currentIndex + 2);
-        int fourthDigit = lexeme.codeUnitAt(currentIndex + 3);
-        if (!_isHexDigit(firstDigit) ||
-            !_isHexDigit(secondDigit) ||
-            !_isHexDigit(thirdDigit) ||
-            !_isHexDigit(fourthDigit)) {
-          // Illegal escape sequence: invalid hex digits
-          _reportErrorForCurrentToken(ParserErrorCode.INVALID_UNICODE_ESCAPE);
-        } else {
-          _appendScalarValue(
-              buffer,
-              lexeme
-                  .substring(
-                      index,
-                      currentIndex + 1),
-              (((((Character.digit(firstDigit, 16) << 4) +
-                                  Character.digit(secondDigit, 16)) <<
-                              4) +
-                          Character.digit(thirdDigit, 16)) <<
-                      4) +
-                  Character
-                      .digit(fourthDigit, 16),
-              index,
-              currentIndex +
-                  3);
-        }
-        return currentIndex + 4;
-      }
-    } else {
-      buffer.writeCharCode(currentChar);
-    }
-    return currentIndex + 1;
-  }
-
-  /**
-   * Decrements the error reporting lock level. If level is more than `0`, then
-   * [reportError] wont report any error.
-   */
-  void _unlockErrorListener() {
-    if (_errorListenerLock == 0) {
-      throw new IllegalStateException(
-          "Attempt to unlock not locked error listener.");
-    }
-    _errorListenerLock--;
-  }
-
-  /**
-   * Validate that the given [parameterList] does not contain any field
-   * initializers.
-   */
-  void _validateFormalParameterList(FormalParameterList parameterList) {
-    for (FormalParameter parameter in parameterList.parameters) {
-      if (parameter is FieldFormalParameter) {
-        _reportErrorForNode(
-            ParserErrorCode.FIELD_INITIALIZER_OUTSIDE_CONSTRUCTOR,
-            parameter.identifier);
-      }
-    }
-  }
-
-  /**
-   * Validate that the given set of [modifiers] is appropriate for a class and
-   * return the 'abstract' keyword if there is one.
-   */
-  Token _validateModifiersForClass(Modifiers modifiers) {
-    _validateModifiersForTopLevelDeclaration(modifiers);
-    if (modifiers.constKeyword != null) {
-      _reportErrorForToken(ParserErrorCode.CONST_CLASS, modifiers.constKeyword);
-    }
-    if (modifiers.externalKeyword != null) {
-      _reportErrorForToken(
-          ParserErrorCode.EXTERNAL_CLASS, modifiers.externalKeyword);
-    }
-    if (modifiers.finalKeyword != null) {
-      _reportErrorForToken(ParserErrorCode.FINAL_CLASS, modifiers.finalKeyword);
-    }
-    if (modifiers.varKeyword != null) {
-      _reportErrorForToken(ParserErrorCode.VAR_CLASS, modifiers.varKeyword);
-    }
-    return modifiers.abstractKeyword;
-  }
-
-  /**
-   * Validate that the given set of [modifiers] is appropriate for a constructor
-   * and return the 'const' keyword if there is one.
-   */
-  Token _validateModifiersForConstructor(Modifiers modifiers) {
-    if (modifiers.abstractKeyword != null) {
-      _reportErrorForToken(
-          ParserErrorCode.ABSTRACT_CLASS_MEMBER, modifiers.abstractKeyword);
-    }
-    if (modifiers.finalKeyword != null) {
-      _reportErrorForToken(
-          ParserErrorCode.FINAL_CONSTRUCTOR, modifiers.finalKeyword);
-    }
-    if (modifiers.staticKeyword != null) {
-      _reportErrorForToken(
-          ParserErrorCode.STATIC_CONSTRUCTOR, modifiers.staticKeyword);
-    }
-    if (modifiers.varKeyword != null) {
-      _reportErrorForToken(
-          ParserErrorCode.CONSTRUCTOR_WITH_RETURN_TYPE, modifiers.varKeyword);
-    }
-    Token externalKeyword = modifiers.externalKeyword;
-    Token constKeyword = modifiers.constKeyword;
-    Token factoryKeyword = modifiers.factoryKeyword;
-    if (externalKeyword != null &&
-        constKeyword != null &&
-        constKeyword.offset < externalKeyword.offset) {
-      _reportErrorForToken(
-          ParserErrorCode.EXTERNAL_AFTER_CONST, externalKeyword);
-    }
-    if (externalKeyword != null &&
-        factoryKeyword != null &&
-        factoryKeyword.offset < externalKeyword.offset) {
-      _reportErrorForToken(
-          ParserErrorCode.EXTERNAL_AFTER_FACTORY, externalKeyword);
-    }
-    return constKeyword;
-  }
-
-  /**
-   * Validate that the given set of [modifiers] is appropriate for a class and
-   * return the 'abstract' keyword if there is one.
-   */
-  void _validateModifiersForEnum(Modifiers modifiers) {
-    _validateModifiersForTopLevelDeclaration(modifiers);
-    if (modifiers.abstractKeyword != null) {
-      _reportErrorForToken(
-          ParserErrorCode.ABSTRACT_ENUM, modifiers.abstractKeyword);
-    }
-    if (modifiers.constKeyword != null) {
-      _reportErrorForToken(ParserErrorCode.CONST_ENUM, modifiers.constKeyword);
-    }
-    if (modifiers.externalKeyword != null) {
-      _reportErrorForToken(
-          ParserErrorCode.EXTERNAL_ENUM, modifiers.externalKeyword);
-    }
-    if (modifiers.finalKeyword != null) {
-      _reportErrorForToken(ParserErrorCode.FINAL_ENUM, modifiers.finalKeyword);
-    }
-    if (modifiers.varKeyword != null) {
-      _reportErrorForToken(ParserErrorCode.VAR_ENUM, modifiers.varKeyword);
-    }
-  }
-
-  /**
-   * Validate that the given set of [modifiers] is appropriate for a field and
-   * return the 'final', 'const' or 'var' keyword if there is one.
-   */
-  Token _validateModifiersForField(Modifiers modifiers) {
-    if (modifiers.abstractKeyword != null) {
-      _reportErrorForCurrentToken(ParserErrorCode.ABSTRACT_CLASS_MEMBER);
-    }
-    if (modifiers.externalKeyword != null) {
-      _reportErrorForToken(
-          ParserErrorCode.EXTERNAL_FIELD, modifiers.externalKeyword);
-    }
-    if (modifiers.factoryKeyword != null) {
-      _reportErrorForToken(
-          ParserErrorCode.NON_CONSTRUCTOR_FACTORY, modifiers.factoryKeyword);
-    }
-    Token staticKeyword = modifiers.staticKeyword;
-    Token constKeyword = modifiers.constKeyword;
-    Token finalKeyword = modifiers.finalKeyword;
-    Token varKeyword = modifiers.varKeyword;
-    if (constKeyword != null) {
-      if (finalKeyword != null) {
-        _reportErrorForToken(ParserErrorCode.CONST_AND_FINAL, finalKeyword);
-      }
-      if (varKeyword != null) {
-        _reportErrorForToken(ParserErrorCode.CONST_AND_VAR, varKeyword);
-      }
-      if (staticKeyword != null && constKeyword.offset < staticKeyword.offset) {
-        _reportErrorForToken(ParserErrorCode.STATIC_AFTER_CONST, staticKeyword);
-      }
-    } else if (finalKeyword != null) {
-      if (varKeyword != null) {
-        _reportErrorForToken(ParserErrorCode.FINAL_AND_VAR, varKeyword);
-      }
-      if (staticKeyword != null && finalKeyword.offset < staticKeyword.offset) {
-        _reportErrorForToken(ParserErrorCode.STATIC_AFTER_FINAL, staticKeyword);
-      }
-    } else if (varKeyword != null &&
-        staticKeyword != null &&
-        varKeyword.offset < staticKeyword.offset) {
-      _reportErrorForToken(ParserErrorCode.STATIC_AFTER_VAR, staticKeyword);
-    }
-    return Token.lexicallyFirst([constKeyword, finalKeyword, varKeyword]);
-  }
-
-  /**
-   * Validate that the given set of [modifiers] is appropriate for a local
-   * function.
-   */
-  void _validateModifiersForFunctionDeclarationStatement(Modifiers modifiers) {
-    if (modifiers.abstractKeyword != null ||
-        modifiers.constKeyword != null ||
-        modifiers.externalKeyword != null ||
-        modifiers.factoryKeyword != null ||
-        modifiers.finalKeyword != null ||
-        modifiers.staticKeyword != null ||
-        modifiers.varKeyword != null) {
-      _reportErrorForCurrentToken(
-          ParserErrorCode.LOCAL_FUNCTION_DECLARATION_MODIFIER);
-    }
-  }
-
-  /**
-   * Validate that the given set of [modifiers] is appropriate for a getter,
-   * setter, or method.
-   */
-  void _validateModifiersForGetterOrSetterOrMethod(Modifiers modifiers) {
-    if (modifiers.abstractKeyword != null) {
-      _reportErrorForCurrentToken(ParserErrorCode.ABSTRACT_CLASS_MEMBER);
-    }
-    if (modifiers.constKeyword != null) {
-      _reportErrorForToken(
-          ParserErrorCode.CONST_METHOD, modifiers.constKeyword);
-    }
-    if (modifiers.factoryKeyword != null) {
-      _reportErrorForToken(
-          ParserErrorCode.NON_CONSTRUCTOR_FACTORY, modifiers.factoryKeyword);
-    }
-    if (modifiers.finalKeyword != null) {
-      _reportErrorForToken(
-          ParserErrorCode.FINAL_METHOD, modifiers.finalKeyword);
-    }
-    if (modifiers.varKeyword != null) {
-      _reportErrorForToken(
-          ParserErrorCode.VAR_RETURN_TYPE, modifiers.varKeyword);
-    }
-    Token externalKeyword = modifiers.externalKeyword;
-    Token staticKeyword = modifiers.staticKeyword;
-    if (externalKeyword != null &&
-        staticKeyword != null &&
-        staticKeyword.offset < externalKeyword.offset) {
-      _reportErrorForToken(
-          ParserErrorCode.EXTERNAL_AFTER_STATIC, externalKeyword);
-    }
-  }
-
-  /**
-   * Validate that the given set of [modifiers] is appropriate for a getter,
-   * setter, or method.
-   */
-  void _validateModifiersForOperator(Modifiers modifiers) {
-    if (modifiers.abstractKeyword != null) {
-      _reportErrorForCurrentToken(ParserErrorCode.ABSTRACT_CLASS_MEMBER);
-    }
-    if (modifiers.constKeyword != null) {
-      _reportErrorForToken(
-          ParserErrorCode.CONST_METHOD, modifiers.constKeyword);
-    }
-    if (modifiers.factoryKeyword != null) {
-      _reportErrorForToken(
-          ParserErrorCode.NON_CONSTRUCTOR_FACTORY, modifiers.factoryKeyword);
-    }
-    if (modifiers.finalKeyword != null) {
-      _reportErrorForToken(
-          ParserErrorCode.FINAL_METHOD, modifiers.finalKeyword);
-    }
-    if (modifiers.staticKeyword != null) {
-      _reportErrorForToken(
-          ParserErrorCode.STATIC_OPERATOR, modifiers.staticKeyword);
-    }
-    if (modifiers.varKeyword != null) {
-      _reportErrorForToken(
-          ParserErrorCode.VAR_RETURN_TYPE, modifiers.varKeyword);
-    }
-  }
-
-  /**
-   * Validate that the given set of [modifiers] is appropriate for a top-level
-   * declaration.
-   */
-  void _validateModifiersForTopLevelDeclaration(Modifiers modifiers) {
-    if (modifiers.factoryKeyword != null) {
-      _reportErrorForToken(ParserErrorCode.FACTORY_TOP_LEVEL_DECLARATION,
-          modifiers.factoryKeyword);
-    }
-    if (modifiers.staticKeyword != null) {
-      _reportErrorForToken(ParserErrorCode.STATIC_TOP_LEVEL_DECLARATION,
-          modifiers.staticKeyword);
-    }
-  }
-
-  /**
-   * Validate that the given set of [modifiers] is appropriate for a top-level
-   * function.
-   */
-  void _validateModifiersForTopLevelFunction(Modifiers modifiers) {
-    _validateModifiersForTopLevelDeclaration(modifiers);
-    if (modifiers.abstractKeyword != null) {
-      _reportErrorForCurrentToken(ParserErrorCode.ABSTRACT_TOP_LEVEL_FUNCTION);
-    }
-    if (modifiers.constKeyword != null) {
-      _reportErrorForToken(ParserErrorCode.CONST_CLASS, modifiers.constKeyword);
-    }
-    if (modifiers.finalKeyword != null) {
-      _reportErrorForToken(ParserErrorCode.FINAL_CLASS, modifiers.finalKeyword);
-    }
-    if (modifiers.varKeyword != null) {
-      _reportErrorForToken(
-          ParserErrorCode.VAR_RETURN_TYPE, modifiers.varKeyword);
-    }
-  }
-
-  /**
-   * Validate that the given set of [modifiers] is appropriate for a field and
-   * return the 'final', 'const' or 'var' keyword if there is one.
-   */
-  Token _validateModifiersForTopLevelVariable(Modifiers modifiers) {
-    _validateModifiersForTopLevelDeclaration(modifiers);
-    if (modifiers.abstractKeyword != null) {
-      _reportErrorForCurrentToken(ParserErrorCode.ABSTRACT_TOP_LEVEL_VARIABLE);
-    }
-    if (modifiers.externalKeyword != null) {
-      _reportErrorForToken(
-          ParserErrorCode.EXTERNAL_FIELD, modifiers.externalKeyword);
-    }
-    Token constKeyword = modifiers.constKeyword;
-    Token finalKeyword = modifiers.finalKeyword;
-    Token varKeyword = modifiers.varKeyword;
-    if (constKeyword != null) {
-      if (finalKeyword != null) {
-        _reportErrorForToken(ParserErrorCode.CONST_AND_FINAL, finalKeyword);
-      }
-      if (varKeyword != null) {
-        _reportErrorForToken(ParserErrorCode.CONST_AND_VAR, varKeyword);
-      }
-    } else if (finalKeyword != null) {
-      if (varKeyword != null) {
-        _reportErrorForToken(ParserErrorCode.FINAL_AND_VAR, varKeyword);
-      }
-    }
-    return Token.lexicallyFirst([constKeyword, finalKeyword, varKeyword]);
-  }
-
-  /**
-   * Validate that the given set of [modifiers] is appropriate for a class and
-   * return the 'abstract' keyword if there is one.
-   */
-  void _validateModifiersForTypedef(Modifiers modifiers) {
-    _validateModifiersForTopLevelDeclaration(modifiers);
-    if (modifiers.abstractKeyword != null) {
-      _reportErrorForToken(
-          ParserErrorCode.ABSTRACT_TYPEDEF, modifiers.abstractKeyword);
-    }
-    if (modifiers.constKeyword != null) {
-      _reportErrorForToken(
-          ParserErrorCode.CONST_TYPEDEF, modifiers.constKeyword);
-    }
-    if (modifiers.externalKeyword != null) {
-      _reportErrorForToken(
-          ParserErrorCode.EXTERNAL_TYPEDEF, modifiers.externalKeyword);
-    }
-    if (modifiers.finalKeyword != null) {
-      _reportErrorForToken(
-          ParserErrorCode.FINAL_TYPEDEF, modifiers.finalKeyword);
-    }
-    if (modifiers.varKeyword != null) {
-      _reportErrorForToken(ParserErrorCode.VAR_TYPEDEF, modifiers.varKeyword);
-    }
-  }
-}
-/**
- * A synthetic keyword token.
- */
-class Parser_SyntheticKeywordToken extends KeywordToken {
-  /**
-   * Initialize a newly created token to represent the given [keyword] at the
-   * given [offset].
-   */
-  Parser_SyntheticKeywordToken(Keyword keyword, int offset)
-      : super(keyword, offset);
-
-  @override
-  int get length => 0;
-
-  @override
-  Token copy() => new Parser_SyntheticKeywordToken(keyword, offset);
-}
-
-/**
- * The error codes used for errors detected by the parser. The convention for
- * this class is for the name of the error code to indicate the problem that
- * caused the error to be generated and for the error message to explain what
- * is wrong and, when appropriate, how the problem can be corrected.
- */
-class ParserErrorCode extends ErrorCode {
-  static const ParserErrorCode ABSTRACT_CLASS_MEMBER = const ParserErrorCode(
-      'ABSTRACT_CLASS_MEMBER',
-      "Members of classes cannot be declared to be 'abstract'");
-
-  static const ParserErrorCode ABSTRACT_ENUM = const ParserErrorCode(
-      'ABSTRACT_ENUM', "Enums cannot be declared to be 'abstract'");
-
-  static const ParserErrorCode ABSTRACT_STATIC_METHOD = const ParserErrorCode(
-      'ABSTRACT_STATIC_METHOD',
-      "Static methods cannot be declared to be 'abstract'");
-
-  static const ParserErrorCode ABSTRACT_TOP_LEVEL_FUNCTION =
-      const ParserErrorCode('ABSTRACT_TOP_LEVEL_FUNCTION',
-          "Top-level functions cannot be declared to be 'abstract'");
-
-  static const ParserErrorCode ABSTRACT_TOP_LEVEL_VARIABLE =
-      const ParserErrorCode('ABSTRACT_TOP_LEVEL_VARIABLE',
-          "Top-level variables cannot be declared to be 'abstract'");
-
-  static const ParserErrorCode ABSTRACT_TYPEDEF = const ParserErrorCode(
-      'ABSTRACT_TYPEDEF', "Type aliases cannot be declared to be 'abstract'");
-
-  static const ParserErrorCode ANNOTATION_ON_ENUM_CONSTANT =
-      const ParserErrorCode('ANNOTATION_ON_ENUM_CONSTANT',
-          "Enum constants cannot have annotations");
-
-  static const ParserErrorCode ASSERT_DOES_NOT_TAKE_ASSIGNMENT =
-      const ParserErrorCode('ASSERT_DOES_NOT_TAKE_ASSIGNMENT',
-          "Assert cannot be called on an assignment");
-
-  static const ParserErrorCode ASSERT_DOES_NOT_TAKE_CASCADE =
-      const ParserErrorCode(
-          'ASSERT_DOES_NOT_TAKE_CASCADE', "Assert cannot be called on cascade");
-
-  static const ParserErrorCode ASSERT_DOES_NOT_TAKE_THROW =
-      const ParserErrorCode(
-          'ASSERT_DOES_NOT_TAKE_THROW', "Assert cannot be called on throws");
-
-  static const ParserErrorCode ASSERT_DOES_NOT_TAKE_RETHROW =
-      const ParserErrorCode('ASSERT_DOES_NOT_TAKE_RETHROW',
-          "Assert cannot be called on rethrows");
-
-  /**
-   * 16.32 Identifier Reference: It is a compile-time error if any of the
-   * identifiers async, await, or yield is used as an identifier in a function
-   * body marked with either async, async*, or sync*.
-   */
-  static const ParserErrorCode ASYNC_KEYWORD_USED_AS_IDENTIFIER =
-      const ParserErrorCode('ASYNC_KEYWORD_USED_AS_IDENTIFIER',
-          "The keywords 'async', 'await', and 'yield' may not be used as identifiers in an asynchronous or generator function.");
-
-  static const ParserErrorCode BREAK_OUTSIDE_OF_LOOP = const ParserErrorCode(
-      'BREAK_OUTSIDE_OF_LOOP',
-      "A break statement cannot be used outside of a loop or switch statement");
-
-  static const ParserErrorCode CLASS_IN_CLASS = const ParserErrorCode(
-      'CLASS_IN_CLASS', "Classes cannot be declared inside other classes");
-
-  static const ParserErrorCode COLON_IN_PLACE_OF_IN = const ParserErrorCode(
-      'COLON_IN_PLACE_OF_IN', "For-in loops use 'in' rather than a colon");
-
-  static const ParserErrorCode CONST_AND_FINAL = const ParserErrorCode(
-      'CONST_AND_FINAL',
-      "Members cannot be declared to be both 'const' and 'final'");
-
-  static const ParserErrorCode CONST_AND_VAR = const ParserErrorCode(
-      'CONST_AND_VAR',
-      "Members cannot be declared to be both 'const' and 'var'");
-
-  static const ParserErrorCode CONST_CLASS = const ParserErrorCode(
-      'CONST_CLASS', "Classes cannot be declared to be 'const'");
-
-  static const ParserErrorCode CONST_CONSTRUCTOR_WITH_BODY =
-      const ParserErrorCode('CONST_CONSTRUCTOR_WITH_BODY',
-          "'const' constructors cannot have a body");
-
-  static const ParserErrorCode CONST_ENUM = const ParserErrorCode(
-      'CONST_ENUM', "Enums cannot be declared to be 'const'");
-
-  static const ParserErrorCode CONST_FACTORY = const ParserErrorCode(
-      'CONST_FACTORY',
-      "Only redirecting factory constructors can be declared to be 'const'");
-
-  static const ParserErrorCode CONST_METHOD = const ParserErrorCode(
-      'CONST_METHOD',
-      "Getters, setters and methods cannot be declared to be 'const'");
-
-  static const ParserErrorCode CONST_TYPEDEF = const ParserErrorCode(
-      'CONST_TYPEDEF', "Type aliases cannot be declared to be 'const'");
-
-  static const ParserErrorCode CONSTRUCTOR_WITH_RETURN_TYPE =
-      const ParserErrorCode('CONSTRUCTOR_WITH_RETURN_TYPE',
-          "Constructors cannot have a return type");
-
-  static const ParserErrorCode CONTINUE_OUTSIDE_OF_LOOP = const ParserErrorCode(
-      'CONTINUE_OUTSIDE_OF_LOOP',
-      "A continue statement cannot be used outside of a loop or switch statement");
-
-  static const ParserErrorCode CONTINUE_WITHOUT_LABEL_IN_CASE =
-      const ParserErrorCode('CONTINUE_WITHOUT_LABEL_IN_CASE',
-          "A continue statement in a switch statement must have a label as a target");
-
-  static const ParserErrorCode DEPRECATED_CLASS_TYPE_ALIAS =
-      const ParserErrorCode('DEPRECATED_CLASS_TYPE_ALIAS',
-          "The 'typedef' mixin application was replaced with 'class'");
-
-  static const ParserErrorCode DIRECTIVE_AFTER_DECLARATION =
-      const ParserErrorCode('DIRECTIVE_AFTER_DECLARATION',
-          "Directives must appear before any declarations");
-
-  static const ParserErrorCode DUPLICATE_LABEL_IN_SWITCH_STATEMENT =
-      const ParserErrorCode('DUPLICATE_LABEL_IN_SWITCH_STATEMENT',
-          "The label {0} was already used in this switch statement");
-
-  static const ParserErrorCode DUPLICATED_MODIFIER = const ParserErrorCode(
-      'DUPLICATED_MODIFIER', "The modifier '{0}' was already specified.");
-
-  static const ParserErrorCode EMPTY_ENUM_BODY = const ParserErrorCode(
-      'EMPTY_ENUM_BODY', "An enum must declare at least one constant name");
-
-  static const ParserErrorCode ENUM_IN_CLASS = const ParserErrorCode(
-      'ENUM_IN_CLASS', "Enums cannot be declared inside classes");
-
-  static const ParserErrorCode EQUALITY_CANNOT_BE_EQUALITY_OPERAND =
-      const ParserErrorCode('EQUALITY_CANNOT_BE_EQUALITY_OPERAND',
-          "Equality expression cannot be operand of another equality expression.");
-
-  static const ParserErrorCode EXPECTED_CASE_OR_DEFAULT = const ParserErrorCode(
-      'EXPECTED_CASE_OR_DEFAULT', "Expected 'case' or 'default'");
-
-  static const ParserErrorCode EXPECTED_CLASS_MEMBER =
-      const ParserErrorCode('EXPECTED_CLASS_MEMBER', "Expected a class member");
-
-  static const ParserErrorCode EXPECTED_EXECUTABLE = const ParserErrorCode(
-      'EXPECTED_EXECUTABLE',
-      "Expected a method, getter, setter or operator declaration");
-
-  static const ParserErrorCode EXPECTED_LIST_OR_MAP_LITERAL =
-      const ParserErrorCode(
-          'EXPECTED_LIST_OR_MAP_LITERAL', "Expected a list or map literal");
-
-  static const ParserErrorCode EXPECTED_STRING_LITERAL = const ParserErrorCode(
-      'EXPECTED_STRING_LITERAL', "Expected a string literal");
-
-  static const ParserErrorCode EXPECTED_TOKEN =
-      const ParserErrorCode('EXPECTED_TOKEN', "Expected to find '{0}'");
-
-  static const ParserErrorCode EXPECTED_TYPE_NAME =
-      const ParserErrorCode('EXPECTED_TYPE_NAME', "Expected a type name");
-
-  static const ParserErrorCode EXPORT_DIRECTIVE_AFTER_PART_DIRECTIVE =
-      const ParserErrorCode('EXPORT_DIRECTIVE_AFTER_PART_DIRECTIVE',
-          "Export directives must preceed part directives");
-
-  static const ParserErrorCode EXTERNAL_AFTER_CONST = const ParserErrorCode(
-      'EXTERNAL_AFTER_CONST',
-      "The modifier 'external' should be before the modifier 'const'");
-
-  static const ParserErrorCode EXTERNAL_AFTER_FACTORY = const ParserErrorCode(
-      'EXTERNAL_AFTER_FACTORY',
-      "The modifier 'external' should be before the modifier 'factory'");
-
-  static const ParserErrorCode EXTERNAL_AFTER_STATIC = const ParserErrorCode(
-      'EXTERNAL_AFTER_STATIC',
-      "The modifier 'external' should be before the modifier 'static'");
-
-  static const ParserErrorCode EXTERNAL_CLASS = const ParserErrorCode(
-      'EXTERNAL_CLASS', "Classes cannot be declared to be 'external'");
-
-  static const ParserErrorCode EXTERNAL_CONSTRUCTOR_WITH_BODY =
-      const ParserErrorCode('EXTERNAL_CONSTRUCTOR_WITH_BODY',
-          "External constructors cannot have a body");
-
-  static const ParserErrorCode EXTERNAL_ENUM = const ParserErrorCode(
-      'EXTERNAL_ENUM', "Enums cannot be declared to be 'external'");
-
-  static const ParserErrorCode EXTERNAL_FIELD = const ParserErrorCode(
-      'EXTERNAL_FIELD', "Fields cannot be declared to be 'external'");
-
-  static const ParserErrorCode EXTERNAL_GETTER_WITH_BODY =
-      const ParserErrorCode(
-          'EXTERNAL_GETTER_WITH_BODY', "External getters cannot have a body");
-
-  static const ParserErrorCode EXTERNAL_METHOD_WITH_BODY =
-      const ParserErrorCode(
-          'EXTERNAL_METHOD_WITH_BODY', "External methods cannot have a body");
-
-  static const ParserErrorCode EXTERNAL_OPERATOR_WITH_BODY =
-      const ParserErrorCode('EXTERNAL_OPERATOR_WITH_BODY',
-          "External operators cannot have a body");
-
-  static const ParserErrorCode EXTERNAL_SETTER_WITH_BODY =
-      const ParserErrorCode(
-          'EXTERNAL_SETTER_WITH_BODY', "External setters cannot have a body");
-
-  static const ParserErrorCode EXTERNAL_TYPEDEF = const ParserErrorCode(
-      'EXTERNAL_TYPEDEF', "Type aliases cannot be declared to be 'external'");
-
-  static const ParserErrorCode FACTORY_TOP_LEVEL_DECLARATION =
-      const ParserErrorCode('FACTORY_TOP_LEVEL_DECLARATION',
-          "Top-level declarations cannot be declared to be 'factory'");
-
-  static const ParserErrorCode FACTORY_WITH_INITIALIZERS =
-      const ParserErrorCode('FACTORY_WITH_INITIALIZERS',
-          "A 'factory' constructor cannot have initializers",
-          "Either remove the 'factory' keyword to make this a generative "
-          "constructor or remove the initializers.");
-
-  static const ParserErrorCode FACTORY_WITHOUT_BODY = const ParserErrorCode(
-      'FACTORY_WITHOUT_BODY',
-      "A non-redirecting 'factory' constructor must have a body");
-
-  static const ParserErrorCode FIELD_INITIALIZER_OUTSIDE_CONSTRUCTOR =
-      const ParserErrorCode('FIELD_INITIALIZER_OUTSIDE_CONSTRUCTOR',
-          "Field initializers can only be used in a constructor");
-
-  static const ParserErrorCode FINAL_AND_VAR = const ParserErrorCode(
-      'FINAL_AND_VAR',
-      "Members cannot be declared to be both 'final' and 'var'");
-
-  static const ParserErrorCode FINAL_CLASS = const ParserErrorCode(
-      'FINAL_CLASS', "Classes cannot be declared to be 'final'");
-
-  static const ParserErrorCode FINAL_CONSTRUCTOR = const ParserErrorCode(
-      'FINAL_CONSTRUCTOR', "A constructor cannot be declared to be 'final'");
-
-  static const ParserErrorCode FINAL_ENUM = const ParserErrorCode(
-      'FINAL_ENUM', "Enums cannot be declared to be 'final'");
-
-  static const ParserErrorCode FINAL_METHOD = const ParserErrorCode(
-      'FINAL_METHOD',
-      "Getters, setters and methods cannot be declared to be 'final'");
-
-  static const ParserErrorCode FINAL_TYPEDEF = const ParserErrorCode(
-      'FINAL_TYPEDEF', "Type aliases cannot be declared to be 'final'");
-
-  static const ParserErrorCode FUNCTION_TYPED_PARAMETER_VAR = const ParserErrorCode(
-      'FUNCTION_TYPED_PARAMETER_VAR',
-      "Function typed parameters cannot specify 'const', 'final' or 'var' instead of return type");
-
-  static const ParserErrorCode GETTER_IN_FUNCTION = const ParserErrorCode(
-      'GETTER_IN_FUNCTION',
-      "Getters cannot be defined within methods or functions");
-
-  static const ParserErrorCode GETTER_WITH_PARAMETERS = const ParserErrorCode(
-      'GETTER_WITH_PARAMETERS',
-      "Getter should be declared without a parameter list");
-
-  static const ParserErrorCode ILLEGAL_ASSIGNMENT_TO_NON_ASSIGNABLE =
-      const ParserErrorCode('ILLEGAL_ASSIGNMENT_TO_NON_ASSIGNABLE',
-          "Illegal assignment to non-assignable expression");
-
-  static const ParserErrorCode IMPLEMENTS_BEFORE_EXTENDS =
-      const ParserErrorCode('IMPLEMENTS_BEFORE_EXTENDS',
-          "The extends clause must be before the implements clause");
-
-  static const ParserErrorCode IMPLEMENTS_BEFORE_WITH = const ParserErrorCode(
-      'IMPLEMENTS_BEFORE_WITH',
-      "The with clause must be before the implements clause");
-
-  static const ParserErrorCode IMPORT_DIRECTIVE_AFTER_PART_DIRECTIVE =
-      const ParserErrorCode('IMPORT_DIRECTIVE_AFTER_PART_DIRECTIVE',
-          "Import directives must preceed part directives");
-
-  static const ParserErrorCode INITIALIZED_VARIABLE_IN_FOR_EACH =
-      const ParserErrorCode('INITIALIZED_VARIABLE_IN_FOR_EACH',
-          "The loop variable in a for-each loop cannot be initialized");
-
-  static const ParserErrorCode INVALID_AWAIT_IN_FOR = const ParserErrorCode(
-      'INVALID_AWAIT_IN_FOR',
-      "The modifier 'await' is not allowed for a normal 'for' statement",
-      "Remove the keyword or use a for-each statement.");
-
-  static const ParserErrorCode INVALID_CODE_POINT = const ParserErrorCode(
-      'INVALID_CODE_POINT',
-      "The escape sequence '{0}' is not a valid code point");
-
-  static const ParserErrorCode INVALID_COMMENT_REFERENCE = const ParserErrorCode(
-      'INVALID_COMMENT_REFERENCE',
-      "Comment references should contain a possibly prefixed identifier and can start with 'new', but should not contain anything else");
-
-  static const ParserErrorCode INVALID_HEX_ESCAPE = const ParserErrorCode(
-      'INVALID_HEX_ESCAPE',
-      "An escape sequence starting with '\\x' must be followed by 2 hexidecimal digits");
-
-  static const ParserErrorCode INVALID_OPERATOR = const ParserErrorCode(
-      'INVALID_OPERATOR', "The string '{0}' is not a valid operator");
-
-  static const ParserErrorCode INVALID_OPERATOR_FOR_SUPER =
-      const ParserErrorCode('INVALID_OPERATOR_FOR_SUPER',
-          "The operator '{0}' cannot be used with 'super'");
-
-  static const ParserErrorCode INVALID_STAR_AFTER_ASYNC = const ParserErrorCode(
-      'INVALID_STAR_AFTER_ASYNC',
-      "The modifier 'async*' is not allowed for an expression function body",
-      "Convert the body to a block.");
-
-  static const ParserErrorCode INVALID_SYNC = const ParserErrorCode(
-      'INVALID_SYNC',
-      "The modifier 'sync' is not allowed for an exrpression function body",
-      "Convert the body to a block.");
-
-  static const ParserErrorCode INVALID_UNICODE_ESCAPE = const ParserErrorCode(
-      'INVALID_UNICODE_ESCAPE',
-      "An escape sequence starting with '\\u' must be followed by 4 hexidecimal digits or from 1 to 6 digits between '{' and '}'");
-
-  static const ParserErrorCode LIBRARY_DIRECTIVE_NOT_FIRST =
-      const ParserErrorCode('LIBRARY_DIRECTIVE_NOT_FIRST',
-          "The library directive must appear before all other directives");
-
-  static const ParserErrorCode LOCAL_FUNCTION_DECLARATION_MODIFIER =
-      const ParserErrorCode('LOCAL_FUNCTION_DECLARATION_MODIFIER',
-          "Local function declarations cannot specify any modifier");
-
-  static const ParserErrorCode MISSING_ASSIGNABLE_SELECTOR =
-      const ParserErrorCode('MISSING_ASSIGNABLE_SELECTOR',
-          "Missing selector such as \".<identifier>\" or \"[0]\"");
-
-  static const ParserErrorCode MISSING_ASSIGNMENT_IN_INITIALIZER =
-      const ParserErrorCode('MISSING_ASSIGNMENT_IN_INITIALIZER',
-          "Expected an assignment after the field name");
-
-  static const ParserErrorCode MISSING_CATCH_OR_FINALLY = const ParserErrorCode(
-      'MISSING_CATCH_OR_FINALLY',
-      "A try statement must have either a catch or finally clause");
-
-  static const ParserErrorCode MISSING_CLASS_BODY = const ParserErrorCode(
-      'MISSING_CLASS_BODY',
-      "A class definition must have a body, even if it is empty");
-
-  static const ParserErrorCode MISSING_CLOSING_PARENTHESIS =
-      const ParserErrorCode(
-          'MISSING_CLOSING_PARENTHESIS', "The closing parenthesis is missing");
-
-  static const ParserErrorCode MISSING_CONST_FINAL_VAR_OR_TYPE =
-      const ParserErrorCode('MISSING_CONST_FINAL_VAR_OR_TYPE',
-          "Variables must be declared using the keywords 'const', 'final', 'var' or a type name");
-
-  static const ParserErrorCode MISSING_ENUM_BODY = const ParserErrorCode(
-      'MISSING_ENUM_BODY',
-      "An enum definition must have a body with at least one constant name");
-
-  static const ParserErrorCode MISSING_EXPRESSION_IN_INITIALIZER =
-      const ParserErrorCode('MISSING_EXPRESSION_IN_INITIALIZER',
-          "Expected an expression after the assignment operator");
-
-  static const ParserErrorCode MISSING_EXPRESSION_IN_THROW =
-      const ParserErrorCode('MISSING_EXPRESSION_IN_THROW',
-          "Throw expressions must compute the object to be thrown");
-
-  static const ParserErrorCode MISSING_FUNCTION_BODY = const ParserErrorCode(
-      'MISSING_FUNCTION_BODY', "A function body must be provided");
-
-  static const ParserErrorCode MISSING_FUNCTION_PARAMETERS =
-      const ParserErrorCode('MISSING_FUNCTION_PARAMETERS',
-          "Functions must have an explicit list of parameters");
-
-  static const ParserErrorCode MISSING_METHOD_PARAMETERS =
-      const ParserErrorCode('MISSING_METHOD_PARAMETERS',
-          "Methods must have an explicit list of parameters");
-
-  static const ParserErrorCode MISSING_GET = const ParserErrorCode(
-      'MISSING_GET',
-      "Getters must have the keyword 'get' before the getter name");
-
-  static const ParserErrorCode MISSING_IDENTIFIER =
-      const ParserErrorCode('MISSING_IDENTIFIER', "Expected an identifier");
-
-  static const ParserErrorCode MISSING_INITIALIZER =
-      const ParserErrorCode('MISSING_INITIALIZER', "Expected an initializer");
-
-  static const ParserErrorCode MISSING_KEYWORD_OPERATOR = const ParserErrorCode(
-      'MISSING_KEYWORD_OPERATOR',
-      "Operator declarations must be preceeded by the keyword 'operator'");
-
-  static const ParserErrorCode MISSING_NAME_IN_LIBRARY_DIRECTIVE =
-      const ParserErrorCode('MISSING_NAME_IN_LIBRARY_DIRECTIVE',
-          "Library directives must include a library name");
-
-  static const ParserErrorCode MISSING_NAME_IN_PART_OF_DIRECTIVE =
-      const ParserErrorCode('MISSING_NAME_IN_PART_OF_DIRECTIVE',
-          "Library directives must include a library name");
-
-  static const ParserErrorCode MISSING_PREFIX_IN_DEFERRED_IMPORT =
-      const ParserErrorCode('MISSING_PREFIX_IN_DEFERRED_IMPORT',
-          "Deferred imports must have a prefix");
-
-  static const ParserErrorCode MISSING_STAR_AFTER_SYNC = const ParserErrorCode(
-      'MISSING_STAR_AFTER_SYNC',
-      "The modifier 'sync' must be followed by a star ('*')",
-      "Remove the modifier or add a star.");
-
-  static const ParserErrorCode MISSING_STATEMENT =
-      const ParserErrorCode('MISSING_STATEMENT', "Expected a statement");
-
-  static const ParserErrorCode MISSING_TERMINATOR_FOR_PARAMETER_GROUP =
-      const ParserErrorCode('MISSING_TERMINATOR_FOR_PARAMETER_GROUP',
-          "There is no '{0}' to close the parameter group");
-
-  static const ParserErrorCode MISSING_TYPEDEF_PARAMETERS =
-      const ParserErrorCode('MISSING_TYPEDEF_PARAMETERS',
-          "Type aliases for functions must have an explicit list of parameters");
-
-  static const ParserErrorCode MISSING_VARIABLE_IN_FOR_EACH = const ParserErrorCode(
-      'MISSING_VARIABLE_IN_FOR_EACH',
-      "A loop variable must be declared in a for-each loop before the 'in', but none were found");
-
-  static const ParserErrorCode MIXED_PARAMETER_GROUPS = const ParserErrorCode(
-      'MIXED_PARAMETER_GROUPS',
-      "Cannot have both positional and named parameters in a single parameter list");
-
-  static const ParserErrorCode MULTIPLE_EXTENDS_CLAUSES = const ParserErrorCode(
-      'MULTIPLE_EXTENDS_CLAUSES',
-      "Each class definition can have at most one extends clause");
-
-  static const ParserErrorCode MULTIPLE_IMPLEMENTS_CLAUSES =
-      const ParserErrorCode('MULTIPLE_IMPLEMENTS_CLAUSES',
-          "Each class definition can have at most one implements clause");
-
-  static const ParserErrorCode MULTIPLE_LIBRARY_DIRECTIVES =
-      const ParserErrorCode('MULTIPLE_LIBRARY_DIRECTIVES',
-          "Only one library directive may be declared in a file");
-
-  static const ParserErrorCode MULTIPLE_NAMED_PARAMETER_GROUPS =
-      const ParserErrorCode('MULTIPLE_NAMED_PARAMETER_GROUPS',
-          "Cannot have multiple groups of named parameters in a single parameter list");
-
-  static const ParserErrorCode MULTIPLE_PART_OF_DIRECTIVES =
-      const ParserErrorCode('MULTIPLE_PART_OF_DIRECTIVES',
-          "Only one part-of directive may be declared in a file");
-
-  static const ParserErrorCode MULTIPLE_POSITIONAL_PARAMETER_GROUPS =
-      const ParserErrorCode('MULTIPLE_POSITIONAL_PARAMETER_GROUPS',
-          "Cannot have multiple groups of positional parameters in a single parameter list");
-
-  static const ParserErrorCode MULTIPLE_VARIABLES_IN_FOR_EACH =
-      const ParserErrorCode('MULTIPLE_VARIABLES_IN_FOR_EACH',
-          "A single loop variable must be declared in a for-each loop before the 'in', but {0} were found");
-
-  static const ParserErrorCode MULTIPLE_WITH_CLAUSES = const ParserErrorCode(
-      'MULTIPLE_WITH_CLAUSES',
-      "Each class definition can have at most one with clause");
-
-  static const ParserErrorCode NAMED_FUNCTION_EXPRESSION =
-      const ParserErrorCode(
-          'NAMED_FUNCTION_EXPRESSION', "Function expressions cannot be named");
-
-  static const ParserErrorCode NAMED_PARAMETER_OUTSIDE_GROUP =
-      const ParserErrorCode('NAMED_PARAMETER_OUTSIDE_GROUP',
-          "Named parameters must be enclosed in curly braces ('{' and '}')");
-
-  static const ParserErrorCode NATIVE_CLAUSE_IN_NON_SDK_CODE =
-      const ParserErrorCode('NATIVE_CLAUSE_IN_NON_SDK_CODE',
-          "Native clause can only be used in the SDK and code that is loaded through native extensions");
-
-  static const ParserErrorCode NATIVE_FUNCTION_BODY_IN_NON_SDK_CODE =
-      const ParserErrorCode('NATIVE_FUNCTION_BODY_IN_NON_SDK_CODE',
-          "Native functions can only be declared in the SDK and code that is loaded through native extensions");
-
-  static const ParserErrorCode NON_CONSTRUCTOR_FACTORY = const ParserErrorCode(
-      'NON_CONSTRUCTOR_FACTORY',
-      "Only constructors can be declared to be a 'factory'");
-
-  static const ParserErrorCode NON_IDENTIFIER_LIBRARY_NAME =
-      const ParserErrorCode('NON_IDENTIFIER_LIBRARY_NAME',
-          "The name of a library must be an identifier");
-
-  static const ParserErrorCode NON_PART_OF_DIRECTIVE_IN_PART =
-      const ParserErrorCode('NON_PART_OF_DIRECTIVE_IN_PART',
-          "The part-of directive must be the only directive in a part");
-
-  static const ParserErrorCode NON_STRING_LITERAL_AS_URI =
-      const ParserErrorCode('NON_STRING_LITERAL_AS_URI',
-          "The URI must be a string literal",
-          "Enclose the URI in either single or double quotes.");
-
-  static const ParserErrorCode NON_USER_DEFINABLE_OPERATOR =
-      const ParserErrorCode('NON_USER_DEFINABLE_OPERATOR',
-          "The operator '{0}' is not user definable");
-
-  static const ParserErrorCode NORMAL_BEFORE_OPTIONAL_PARAMETERS =
-      const ParserErrorCode('NORMAL_BEFORE_OPTIONAL_PARAMETERS',
-          "Normal parameters must occur before optional parameters");
-
-  static const ParserErrorCode POSITIONAL_AFTER_NAMED_ARGUMENT =
-      const ParserErrorCode('POSITIONAL_AFTER_NAMED_ARGUMENT',
-          "Positional arguments must occur before named arguments");
-
-  static const ParserErrorCode POSITIONAL_PARAMETER_OUTSIDE_GROUP =
-      const ParserErrorCode('POSITIONAL_PARAMETER_OUTSIDE_GROUP',
-          "Positional parameters must be enclosed in square brackets ('[' and ']')");
-
-  static const ParserErrorCode REDIRECTION_IN_NON_FACTORY_CONSTRUCTOR =
-      const ParserErrorCode('REDIRECTION_IN_NON_FACTORY_CONSTRUCTOR',
-          "Only factory constructor can specify '=' redirection.");
-
-  static const ParserErrorCode SETTER_IN_FUNCTION = const ParserErrorCode(
-      'SETTER_IN_FUNCTION',
-      "Setters cannot be defined within methods or functions");
-
-  static const ParserErrorCode STATIC_AFTER_CONST = const ParserErrorCode(
-      'STATIC_AFTER_CONST',
-      "The modifier 'static' should be before the modifier 'const'");
-
-  static const ParserErrorCode STATIC_AFTER_FINAL = const ParserErrorCode(
-      'STATIC_AFTER_FINAL',
-      "The modifier 'static' should be before the modifier 'final'");
-
-  static const ParserErrorCode STATIC_AFTER_VAR = const ParserErrorCode(
-      'STATIC_AFTER_VAR',
-      "The modifier 'static' should be before the modifier 'var'");
-
-  static const ParserErrorCode STATIC_CONSTRUCTOR = const ParserErrorCode(
-      'STATIC_CONSTRUCTOR', "Constructors cannot be static");
-
-  static const ParserErrorCode STATIC_GETTER_WITHOUT_BODY =
-      const ParserErrorCode(
-          'STATIC_GETTER_WITHOUT_BODY', "A 'static' getter must have a body");
-
-  static const ParserErrorCode STATIC_OPERATOR =
-      const ParserErrorCode('STATIC_OPERATOR', "Operators cannot be static");
-
-  static const ParserErrorCode STATIC_SETTER_WITHOUT_BODY =
-      const ParserErrorCode(
-          'STATIC_SETTER_WITHOUT_BODY', "A 'static' setter must have a body");
-
-  static const ParserErrorCode STATIC_TOP_LEVEL_DECLARATION =
-      const ParserErrorCode('STATIC_TOP_LEVEL_DECLARATION',
-          "Top-level declarations cannot be declared to be 'static'");
-
-  static const ParserErrorCode SWITCH_HAS_CASE_AFTER_DEFAULT_CASE =
-      const ParserErrorCode('SWITCH_HAS_CASE_AFTER_DEFAULT_CASE',
-          "The 'default' case should be the last case in a switch statement");
-
-  static const ParserErrorCode SWITCH_HAS_MULTIPLE_DEFAULT_CASES =
-      const ParserErrorCode('SWITCH_HAS_MULTIPLE_DEFAULT_CASES',
-          "The 'default' case can only be declared once");
-
-  static const ParserErrorCode TOP_LEVEL_OPERATOR = const ParserErrorCode(
-      'TOP_LEVEL_OPERATOR', "Operators must be declared within a class");
-
-  static const ParserErrorCode TYPEDEF_IN_CLASS = const ParserErrorCode(
-      'TYPEDEF_IN_CLASS',
-      "Function type aliases cannot be declared inside classes");
-
-  static const ParserErrorCode UNEXPECTED_TERMINATOR_FOR_PARAMETER_GROUP =
-      const ParserErrorCode('UNEXPECTED_TERMINATOR_FOR_PARAMETER_GROUP',
-          "There is no '{0}' to open a parameter group");
-
-  static const ParserErrorCode UNEXPECTED_TOKEN =
-      const ParserErrorCode('UNEXPECTED_TOKEN', "Unexpected token '{0}'");
-
-  static const ParserErrorCode WITH_BEFORE_EXTENDS = const ParserErrorCode(
-      'WITH_BEFORE_EXTENDS',
-      "The extends clause must be before the with clause");
-
-  static const ParserErrorCode WITH_WITHOUT_EXTENDS = const ParserErrorCode(
-      'WITH_WITHOUT_EXTENDS',
-      "The with clause cannot be used without an extends clause");
-
-  static const ParserErrorCode WRONG_SEPARATOR_FOR_NAMED_PARAMETER =
-      const ParserErrorCode('WRONG_SEPARATOR_FOR_NAMED_PARAMETER',
-          "The default value of a named parameter should be preceeded by ':'");
-
-  static const ParserErrorCode WRONG_SEPARATOR_FOR_POSITIONAL_PARAMETER =
-      const ParserErrorCode('WRONG_SEPARATOR_FOR_POSITIONAL_PARAMETER',
-          "The default value of a positional parameter should be preceeded by '='");
-
-  static const ParserErrorCode WRONG_TERMINATOR_FOR_PARAMETER_GROUP =
-      const ParserErrorCode('WRONG_TERMINATOR_FOR_PARAMETER_GROUP',
-          "Expected '{0}' to close parameter group");
-
-  static const ParserErrorCode VAR_AND_TYPE = const ParserErrorCode(
-      'VAR_AND_TYPE',
-      "Variables cannot be declared using both 'var' and a type name; remove the 'var'");
-
-  static const ParserErrorCode VAR_AS_TYPE_NAME = const ParserErrorCode(
-      'VAR_AS_TYPE_NAME', "The keyword 'var' cannot be used as a type name");
-
-  static const ParserErrorCode VAR_CLASS = const ParserErrorCode(
-      'VAR_CLASS', "Classes cannot be declared to be 'var'");
-
-  static const ParserErrorCode VAR_ENUM =
-      const ParserErrorCode('VAR_ENUM', "Enums cannot be declared to be 'var'");
-
-  static const ParserErrorCode VAR_RETURN_TYPE = const ParserErrorCode(
-      'VAR_RETURN_TYPE', "The return type cannot be 'var'");
-
-  static const ParserErrorCode VAR_TYPEDEF = const ParserErrorCode(
-      'VAR_TYPEDEF', "Type aliases cannot be declared to be 'var'");
-
-  static const ParserErrorCode VOID_PARAMETER = const ParserErrorCode(
-      'VOID_PARAMETER', "Parameters cannot have a type of 'void'");
-
-  static const ParserErrorCode VOID_VARIABLE = const ParserErrorCode(
-      'VOID_VARIABLE', "Variables cannot have a type of 'void'");
-
-  /**
-   * Initialize a newly created error code to have the given [name]. The message
-   * associated with the error will be created from the given [message]
-   * template. The correction associated with the error will be created from the
-   * given [correction] template.
-   */
-  const ParserErrorCode(String name, String message, [String correction])
-      : super(name, message, correction);
-
-  @override
-  ErrorSeverity get errorSeverity => ErrorSeverity.ERROR;
-
-  @override
-  ErrorType get type => ErrorType.SYNTACTIC_ERROR;
-}
-
-/**
- * An object that copies resolution information from one AST structure to
- * another as long as the structures of the corresponding children of a pair of
- * nodes are the same.
- */
-class ResolutionCopier implements AstVisitor<bool> {
-  /**
-   * The AST node with which the node being visited is to be compared. This is
-   * only valid at the beginning of each visit method (until [isEqualNodes] is
-   * invoked).
-   */
-  AstNode _toNode;
-
-  @override
-  bool visitAdjacentStrings(AdjacentStrings node) {
-    AdjacentStrings toNode = this._toNode as AdjacentStrings;
-    return _isEqualNodeLists(node.strings, toNode.strings);
-  }
-
-  @override
-  bool visitAnnotation(Annotation node) {
-    Annotation toNode = this._toNode as Annotation;
-    if (_and(_isEqualTokens(node.atSign, toNode.atSign),
-        _isEqualNodes(node.name, toNode.name),
-        _isEqualTokens(node.period, toNode.period),
-        _isEqualNodes(node.constructorName, toNode.constructorName),
-        _isEqualNodes(node.arguments, toNode.arguments))) {
-      toNode.element = node.element;
-      return true;
-    }
-    return false;
-  }
-
-  @override
-  bool visitArgumentList(ArgumentList node) {
-    ArgumentList toNode = this._toNode as ArgumentList;
-    return _and(_isEqualTokens(node.leftParenthesis, toNode.leftParenthesis),
-        _isEqualNodeLists(node.arguments, toNode.arguments),
-        _isEqualTokens(node.rightParenthesis, toNode.rightParenthesis));
-  }
-
-  @override
-  bool visitAsExpression(AsExpression node) {
-    AsExpression toNode = this._toNode as AsExpression;
-    if (_and(_isEqualNodes(node.expression, toNode.expression),
-        _isEqualTokens(node.asOperator, toNode.asOperator),
-        _isEqualNodes(node.type, toNode.type))) {
-      toNode.propagatedType = node.propagatedType;
-      toNode.staticType = node.staticType;
-      return true;
-    }
-    return false;
-  }
-
-  @override
-  bool visitAssertStatement(AssertStatement node) {
-    AssertStatement toNode = this._toNode as AssertStatement;
-    return _and(_isEqualTokens(node.assertKeyword, toNode.assertKeyword),
-        _isEqualTokens(node.leftParenthesis, toNode.leftParenthesis),
-        _isEqualNodes(node.condition, toNode.condition),
-        _isEqualTokens(node.rightParenthesis, toNode.rightParenthesis),
-        _isEqualTokens(node.semicolon, toNode.semicolon));
-  }
-
-  @override
-  bool visitAssignmentExpression(AssignmentExpression node) {
-    AssignmentExpression toNode = this._toNode as AssignmentExpression;
-    if (_and(_isEqualNodes(node.leftHandSide, toNode.leftHandSide),
-        _isEqualTokens(node.operator, toNode.operator),
-        _isEqualNodes(node.rightHandSide, toNode.rightHandSide))) {
-      toNode.propagatedElement = node.propagatedElement;
-      toNode.propagatedType = node.propagatedType;
-      toNode.staticElement = node.staticElement;
-      toNode.staticType = node.staticType;
-      return true;
-    }
-    return false;
-  }
-
-  @override
-  bool visitAwaitExpression(AwaitExpression node) {
-    AwaitExpression toNode = this._toNode as AwaitExpression;
-    return _and(_isEqualTokens(node.awaitKeyword, toNode.awaitKeyword),
-        _isEqualNodes(node.expression, toNode.expression));
-  }
-
-  @override
-  bool visitBinaryExpression(BinaryExpression node) {
-    BinaryExpression toNode = this._toNode as BinaryExpression;
-    if (_and(_isEqualNodes(node.leftOperand, toNode.leftOperand),
-        _isEqualTokens(node.operator, toNode.operator),
-        _isEqualNodes(node.rightOperand, toNode.rightOperand))) {
-      toNode.propagatedElement = node.propagatedElement;
-      toNode.propagatedType = node.propagatedType;
-      toNode.staticElement = node.staticElement;
-      toNode.staticType = node.staticType;
-      return true;
-    }
-    return false;
-  }
-
-  @override
-  bool visitBlock(Block node) {
-    Block toNode = this._toNode as Block;
-    return _and(_isEqualTokens(node.leftBracket, toNode.leftBracket),
-        _isEqualNodeLists(node.statements, toNode.statements),
-        _isEqualTokens(node.rightBracket, toNode.rightBracket));
-  }
-
-  @override
-  bool visitBlockFunctionBody(BlockFunctionBody node) {
-    BlockFunctionBody toNode = this._toNode as BlockFunctionBody;
-    return _isEqualNodes(node.block, toNode.block);
-  }
-
-  @override
-  bool visitBooleanLiteral(BooleanLiteral node) {
-    BooleanLiteral toNode = this._toNode as BooleanLiteral;
-    if (_and(_isEqualTokens(node.literal, toNode.literal),
-        node.value == toNode.value)) {
-      toNode.propagatedType = node.propagatedType;
-      toNode.staticType = node.staticType;
-      return true;
-    }
-    return false;
-  }
-
-  @override
-  bool visitBreakStatement(BreakStatement node) {
-    BreakStatement toNode = this._toNode as BreakStatement;
-    if (_and(_isEqualTokens(node.breakKeyword, toNode.breakKeyword),
-        _isEqualNodes(node.label, toNode.label),
-        _isEqualTokens(node.semicolon, toNode.semicolon))) {
-      // TODO(paulberry): map node.target to toNode.target.
-      return true;
-    }
-    return false;
-  }
-
-  @override
-  bool visitCascadeExpression(CascadeExpression node) {
-    CascadeExpression toNode = this._toNode as CascadeExpression;
-    if (_and(_isEqualNodes(node.target, toNode.target),
-        _isEqualNodeLists(node.cascadeSections, toNode.cascadeSections))) {
-      toNode.propagatedType = node.propagatedType;
-      toNode.staticType = node.staticType;
-      return true;
-    }
-    return false;
-  }
-
-  @override
-  bool visitCatchClause(CatchClause node) {
-    CatchClause toNode = this._toNode as CatchClause;
-    return _and(_isEqualTokens(node.onKeyword, toNode.onKeyword),
-        _isEqualNodes(node.exceptionType, toNode.exceptionType),
-        _isEqualTokens(node.catchKeyword, toNode.catchKeyword),
-        _isEqualTokens(node.leftParenthesis, toNode.leftParenthesis),
-        _isEqualNodes(node.exceptionParameter, toNode.exceptionParameter),
-        _isEqualTokens(node.comma, toNode.comma),
-        _isEqualNodes(node.stackTraceParameter, toNode.stackTraceParameter),
-        _isEqualTokens(node.rightParenthesis, toNode.rightParenthesis),
-        _isEqualNodes(node.body, toNode.body));
-  }
-
-  @override
-  bool visitClassDeclaration(ClassDeclaration node) {
-    ClassDeclaration toNode = this._toNode as ClassDeclaration;
-    return _and(
-        _isEqualNodes(node.documentationComment, toNode.documentationComment),
-        _isEqualNodeLists(node.metadata, toNode.metadata),
-        _isEqualTokens(node.abstractKeyword, toNode.abstractKeyword),
-        _isEqualTokens(node.classKeyword, toNode.classKeyword),
-        _isEqualNodes(node.name, toNode.name),
-        _isEqualNodes(node.typeParameters, toNode.typeParameters),
-        _isEqualNodes(node.extendsClause, toNode.extendsClause),
-        _isEqualNodes(node.withClause, toNode.withClause),
-        _isEqualNodes(node.implementsClause, toNode.implementsClause),
-        _isEqualTokens(node.leftBracket, toNode.leftBracket),
-        _isEqualNodeLists(node.members, toNode.members),
-        _isEqualTokens(node.rightBracket, toNode.rightBracket));
-  }
-
-  @override
-  bool visitClassTypeAlias(ClassTypeAlias node) {
-    ClassTypeAlias toNode = this._toNode as ClassTypeAlias;
-    return _and(
-        _isEqualNodes(node.documentationComment, toNode.documentationComment),
-        _isEqualNodeLists(node.metadata, toNode.metadata),
-        _isEqualTokens(node.typedefKeyword, toNode.typedefKeyword),
-        _isEqualNodes(node.name, toNode.name),
-        _isEqualNodes(node.typeParameters, toNode.typeParameters),
-        _isEqualTokens(node.equals, toNode.equals),
-        _isEqualTokens(node.abstractKeyword, toNode.abstractKeyword),
-        _isEqualNodes(node.superclass, toNode.superclass),
-        _isEqualNodes(node.withClause, toNode.withClause),
-        _isEqualNodes(node.implementsClause, toNode.implementsClause),
-        _isEqualTokens(node.semicolon, toNode.semicolon));
-  }
-
-  @override
-  bool visitComment(Comment node) {
-    Comment toNode = this._toNode as Comment;
-    return _isEqualNodeLists(node.references, toNode.references);
-  }
-
-  @override
-  bool visitCommentReference(CommentReference node) {
-    CommentReference toNode = this._toNode as CommentReference;
-    return _and(_isEqualTokens(node.newKeyword, toNode.newKeyword),
-        _isEqualNodes(node.identifier, toNode.identifier));
-  }
-
-  @override
-  bool visitCompilationUnit(CompilationUnit node) {
-    CompilationUnit toNode = this._toNode as CompilationUnit;
-    if (_and(_isEqualTokens(node.beginToken, toNode.beginToken),
-        _isEqualNodes(node.scriptTag, toNode.scriptTag),
-        _isEqualNodeLists(node.directives, toNode.directives),
-        _isEqualNodeLists(node.declarations, toNode.declarations),
-        _isEqualTokens(node.endToken, toNode.endToken))) {
-      toNode.element = node.element;
-      return true;
-    }
-    return false;
-  }
-
-  @override
-  bool visitConditionalExpression(ConditionalExpression node) {
-    ConditionalExpression toNode = this._toNode as ConditionalExpression;
-    if (_and(_isEqualNodes(node.condition, toNode.condition),
-        _isEqualTokens(node.question, toNode.question),
-        _isEqualNodes(node.thenExpression, toNode.thenExpression),
-        _isEqualTokens(node.colon, toNode.colon),
-        _isEqualNodes(node.elseExpression, toNode.elseExpression))) {
-      toNode.propagatedType = node.propagatedType;
-      toNode.staticType = node.staticType;
-      return true;
-    }
-    return false;
-  }
-
-  @override
-  bool visitConstructorDeclaration(ConstructorDeclaration node) {
-    ConstructorDeclaration toNode = this._toNode as ConstructorDeclaration;
-    if (_and(
-        _isEqualNodes(node.documentationComment, toNode.documentationComment),
-        _isEqualNodeLists(node.metadata, toNode.metadata),
-        _isEqualTokens(node.externalKeyword, toNode.externalKeyword),
-        _isEqualTokens(node.constKeyword, toNode.constKeyword),
-        _isEqualTokens(node.factoryKeyword, toNode.factoryKeyword),
-        _isEqualNodes(node.returnType, toNode.returnType),
-        _isEqualTokens(node.period, toNode.period),
-        _isEqualNodes(node.name, toNode.name),
-        _isEqualNodes(node.parameters, toNode.parameters),
-        _isEqualTokens(node.separator, toNode.separator),
-        _isEqualNodeLists(node.initializers, toNode.initializers),
-        _isEqualNodes(node.redirectedConstructor, toNode.redirectedConstructor),
-        _isEqualNodes(node.body, toNode.body))) {
-      toNode.element = node.element;
-      return true;
-    }
-    return false;
-  }
-
-  @override
-  bool visitConstructorFieldInitializer(ConstructorFieldInitializer node) {
-    ConstructorFieldInitializer toNode =
-        this._toNode as ConstructorFieldInitializer;
-    return _and(_isEqualTokens(node.thisKeyword, toNode.thisKeyword),
-        _isEqualTokens(node.period, toNode.period),
-        _isEqualNodes(node.fieldName, toNode.fieldName),
-        _isEqualTokens(node.equals, toNode.equals),
-        _isEqualNodes(node.expression, toNode.expression));
-  }
-
-  @override
-  bool visitConstructorName(ConstructorName node) {
-    ConstructorName toNode = this._toNode as ConstructorName;
-    if (_and(_isEqualNodes(node.type, toNode.type),
-        _isEqualTokens(node.period, toNode.period),
-        _isEqualNodes(node.name, toNode.name))) {
-      toNode.staticElement = node.staticElement;
-      return true;
-    }
-    return false;
-  }
-
-  @override
-  bool visitContinueStatement(ContinueStatement node) {
-    ContinueStatement toNode = this._toNode as ContinueStatement;
-    if (_and(_isEqualTokens(node.continueKeyword, toNode.continueKeyword),
-        _isEqualNodes(node.label, toNode.label),
-        _isEqualTokens(node.semicolon, toNode.semicolon))) {
-      // TODO(paulberry): map node.target to toNode.target.
-      return true;
-    }
-    return false;
-  }
-
-  @override
-  bool visitDeclaredIdentifier(DeclaredIdentifier node) {
-    DeclaredIdentifier toNode = this._toNode as DeclaredIdentifier;
-    return _and(
-        _isEqualNodes(node.documentationComment, toNode.documentationComment),
-        _isEqualNodeLists(node.metadata, toNode.metadata),
-        _isEqualTokens(node.keyword, toNode.keyword),
-        _isEqualNodes(node.type, toNode.type),
-        _isEqualNodes(node.identifier, toNode.identifier));
-  }
-
-  @override
-  bool visitDefaultFormalParameter(DefaultFormalParameter node) {
-    DefaultFormalParameter toNode = this._toNode as DefaultFormalParameter;
-    return _and(_isEqualNodes(node.parameter, toNode.parameter),
-        node.kind == toNode.kind,
-        _isEqualTokens(node.separator, toNode.separator),
-        _isEqualNodes(node.defaultValue, toNode.defaultValue));
-  }
-
-  @override
-  bool visitDoStatement(DoStatement node) {
-    DoStatement toNode = this._toNode as DoStatement;
-    return _and(_isEqualTokens(node.doKeyword, toNode.doKeyword),
-        _isEqualNodes(node.body, toNode.body),
-        _isEqualTokens(node.whileKeyword, toNode.whileKeyword),
-        _isEqualTokens(node.leftParenthesis, toNode.leftParenthesis),
-        _isEqualNodes(node.condition, toNode.condition),
-        _isEqualTokens(node.rightParenthesis, toNode.rightParenthesis),
-        _isEqualTokens(node.semicolon, toNode.semicolon));
-  }
-
-  @override
-  bool visitDoubleLiteral(DoubleLiteral node) {
-    DoubleLiteral toNode = this._toNode as DoubleLiteral;
-    if (_and(_isEqualTokens(node.literal, toNode.literal),
-        node.value == toNode.value)) {
-      toNode.propagatedType = node.propagatedType;
-      toNode.staticType = node.staticType;
-      return true;
-    }
-    return false;
-  }
-
-  @override
-  bool visitEmptyFunctionBody(EmptyFunctionBody node) {
-    EmptyFunctionBody toNode = this._toNode as EmptyFunctionBody;
-    return _isEqualTokens(node.semicolon, toNode.semicolon);
-  }
-
-  @override
-  bool visitEmptyStatement(EmptyStatement node) {
-    EmptyStatement toNode = this._toNode as EmptyStatement;
-    return _isEqualTokens(node.semicolon, toNode.semicolon);
-  }
-
-  @override
-  bool visitEnumConstantDeclaration(EnumConstantDeclaration node) {
-    EnumConstantDeclaration toNode = this._toNode as EnumConstantDeclaration;
-    return _and(
-        _isEqualNodes(node.documentationComment, toNode.documentationComment),
-        _isEqualNodeLists(node.metadata, toNode.metadata),
-        _isEqualNodes(node.name, toNode.name));
-  }
-
-  @override
-  bool visitEnumDeclaration(EnumDeclaration node) {
-    EnumDeclaration toNode = this._toNode as EnumDeclaration;
-    return _and(
-        _isEqualNodes(node.documentationComment, toNode.documentationComment),
-        _isEqualNodeLists(node.metadata, toNode.metadata),
-        _isEqualTokens(node.enumKeyword, toNode.enumKeyword),
-        _isEqualNodes(node.name, toNode.name),
-        _isEqualTokens(node.leftBracket, toNode.leftBracket),
-        _isEqualNodeLists(node.constants, toNode.constants),
-        _isEqualTokens(node.rightBracket, toNode.rightBracket));
-  }
-
-  @override
-  bool visitExportDirective(ExportDirective node) {
-    ExportDirective toNode = this._toNode as ExportDirective;
-    if (_and(
-        _isEqualNodes(node.documentationComment, toNode.documentationComment),
-        _isEqualNodeLists(node.metadata, toNode.metadata),
-        _isEqualTokens(node.keyword, toNode.keyword),
-        _isEqualNodes(node.uri, toNode.uri),
-        _isEqualNodeLists(node.combinators, toNode.combinators),
-        _isEqualTokens(node.semicolon, toNode.semicolon))) {
-      toNode.element = node.element;
-      return true;
-    }
-    return false;
-  }
-
-  @override
-  bool visitExpressionFunctionBody(ExpressionFunctionBody node) {
-    ExpressionFunctionBody toNode = this._toNode as ExpressionFunctionBody;
-    return _and(
-        _isEqualTokens(node.functionDefinition, toNode.functionDefinition),
-        _isEqualNodes(node.expression, toNode.expression),
-        _isEqualTokens(node.semicolon, toNode.semicolon));
-  }
-
-  @override
-  bool visitExpressionStatement(ExpressionStatement node) {
-    ExpressionStatement toNode = this._toNode as ExpressionStatement;
-    return _and(_isEqualNodes(node.expression, toNode.expression),
-        _isEqualTokens(node.semicolon, toNode.semicolon));
-  }
-
-  @override
-  bool visitExtendsClause(ExtendsClause node) {
-    ExtendsClause toNode = this._toNode as ExtendsClause;
-    return _and(_isEqualTokens(node.extendsKeyword, toNode.extendsKeyword),
-        _isEqualNodes(node.superclass, toNode.superclass));
-  }
-
-  @override
-  bool visitFieldDeclaration(FieldDeclaration node) {
-    FieldDeclaration toNode = this._toNode as FieldDeclaration;
-    return _and(
-        _isEqualNodes(node.documentationComment, toNode.documentationComment),
-        _isEqualNodeLists(node.metadata, toNode.metadata),
-        _isEqualTokens(node.staticKeyword, toNode.staticKeyword),
-        _isEqualNodes(node.fields, toNode.fields),
-        _isEqualTokens(node.semicolon, toNode.semicolon));
-  }
-
-  @override
-  bool visitFieldFormalParameter(FieldFormalParameter node) {
-    FieldFormalParameter toNode = this._toNode as FieldFormalParameter;
-    return _and(
-        _isEqualNodes(node.documentationComment, toNode.documentationComment),
-        _isEqualNodeLists(node.metadata, toNode.metadata),
-        _isEqualTokens(node.keyword, toNode.keyword),
-        _isEqualNodes(node.type, toNode.type),
-        _isEqualTokens(node.thisKeyword, toNode.thisKeyword),
-        _isEqualTokens(node.period, toNode.period),
-        _isEqualNodes(node.identifier, toNode.identifier));
-  }
-
-  @override
-  bool visitForEachStatement(ForEachStatement node) {
-    ForEachStatement toNode = this._toNode as ForEachStatement;
-    return _and(_isEqualTokens(node.forKeyword, toNode.forKeyword),
-        _isEqualTokens(node.leftParenthesis, toNode.leftParenthesis),
-        _isEqualNodes(node.loopVariable, toNode.loopVariable),
-        _isEqualTokens(node.inKeyword, toNode.inKeyword),
-        _isEqualNodes(node.iterable, toNode.iterable),
-        _isEqualTokens(node.rightParenthesis, toNode.rightParenthesis),
-        _isEqualNodes(node.body, toNode.body));
-  }
-
-  @override
-  bool visitFormalParameterList(FormalParameterList node) {
-    FormalParameterList toNode = this._toNode as FormalParameterList;
-    return _and(_isEqualTokens(node.leftParenthesis, toNode.leftParenthesis),
-        _isEqualNodeLists(node.parameters, toNode.parameters),
-        _isEqualTokens(node.leftDelimiter, toNode.leftDelimiter),
-        _isEqualTokens(node.rightDelimiter, toNode.rightDelimiter),
-        _isEqualTokens(node.rightParenthesis, toNode.rightParenthesis));
-  }
-
-  @override
-  bool visitForStatement(ForStatement node) {
-    ForStatement toNode = this._toNode as ForStatement;
-    return _and(_isEqualTokens(node.forKeyword, toNode.forKeyword),
-        _isEqualTokens(node.leftParenthesis, toNode.leftParenthesis),
-        _isEqualNodes(node.variables, toNode.variables),
-        _isEqualNodes(node.initialization, toNode.initialization),
-        _isEqualTokens(node.leftSeparator, toNode.leftSeparator),
-        _isEqualNodes(node.condition, toNode.condition),
-        _isEqualTokens(node.rightSeparator, toNode.rightSeparator),
-        _isEqualNodeLists(node.updaters, toNode.updaters),
-        _isEqualTokens(node.rightParenthesis, toNode.rightParenthesis),
-        _isEqualNodes(node.body, toNode.body));
-  }
-
-  @override
-  bool visitFunctionDeclaration(FunctionDeclaration node) {
-    FunctionDeclaration toNode = this._toNode as FunctionDeclaration;
-    return _and(
-        _isEqualNodes(node.documentationComment, toNode.documentationComment),
-        _isEqualNodeLists(node.metadata, toNode.metadata),
-        _isEqualTokens(node.externalKeyword, toNode.externalKeyword),
-        _isEqualNodes(node.returnType, toNode.returnType),
-        _isEqualTokens(node.propertyKeyword, toNode.propertyKeyword),
-        _isEqualNodes(node.name, toNode.name),
-        _isEqualNodes(node.functionExpression, toNode.functionExpression));
-  }
-
-  @override
-  bool visitFunctionDeclarationStatement(FunctionDeclarationStatement node) {
-    FunctionDeclarationStatement toNode =
-        this._toNode as FunctionDeclarationStatement;
-    return _isEqualNodes(node.functionDeclaration, toNode.functionDeclaration);
-  }
-
-  @override
-  bool visitFunctionExpression(FunctionExpression node) {
-    FunctionExpression toNode = this._toNode as FunctionExpression;
-    if (_and(_isEqualNodes(node.parameters, toNode.parameters),
-        _isEqualNodes(node.body, toNode.body))) {
-      toNode.element = node.element;
-      toNode.propagatedType = node.propagatedType;
-      toNode.staticType = node.staticType;
-      return true;
-    }
-    return false;
-  }
-
-  @override
-  bool visitFunctionExpressionInvocation(FunctionExpressionInvocation node) {
-    FunctionExpressionInvocation toNode =
-        this._toNode as FunctionExpressionInvocation;
-    if (_and(_isEqualNodes(node.function, toNode.function),
-        _isEqualNodes(node.argumentList, toNode.argumentList))) {
-      toNode.propagatedElement = node.propagatedElement;
-      toNode.propagatedType = node.propagatedType;
-      toNode.staticElement = node.staticElement;
-      toNode.staticType = node.staticType;
-      return true;
-    }
-    return false;
-  }
-
-  @override
-  bool visitFunctionTypeAlias(FunctionTypeAlias node) {
-    FunctionTypeAlias toNode = this._toNode as FunctionTypeAlias;
-    return _and(
-        _isEqualNodes(node.documentationComment, toNode.documentationComment),
-        _isEqualNodeLists(node.metadata, toNode.metadata),
-        _isEqualTokens(node.typedefKeyword, toNode.typedefKeyword),
-        _isEqualNodes(node.returnType, toNode.returnType),
-        _isEqualNodes(node.name, toNode.name),
-        _isEqualNodes(node.typeParameters, toNode.typeParameters),
-        _isEqualNodes(node.parameters, toNode.parameters),
-        _isEqualTokens(node.semicolon, toNode.semicolon));
-  }
-
-  @override
-  bool visitFunctionTypedFormalParameter(FunctionTypedFormalParameter node) {
-    FunctionTypedFormalParameter toNode =
-        this._toNode as FunctionTypedFormalParameter;
-    return _and(
-        _isEqualNodes(node.documentationComment, toNode.documentationComment),
-        _isEqualNodeLists(node.metadata, toNode.metadata),
-        _isEqualNodes(node.returnType, toNode.returnType),
-        _isEqualNodes(node.identifier, toNode.identifier),
-        _isEqualNodes(node.parameters, toNode.parameters));
-  }
-
-  @override
-  bool visitHideCombinator(HideCombinator node) {
-    HideCombinator toNode = this._toNode as HideCombinator;
-    return _and(_isEqualTokens(node.keyword, toNode.keyword),
-        _isEqualNodeLists(node.hiddenNames, toNode.hiddenNames));
-  }
-
-  @override
-  bool visitIfStatement(IfStatement node) {
-    IfStatement toNode = this._toNode as IfStatement;
-    return _and(_isEqualTokens(node.ifKeyword, toNode.ifKeyword),
-        _isEqualTokens(node.leftParenthesis, toNode.leftParenthesis),
-        _isEqualNodes(node.condition, toNode.condition),
-        _isEqualTokens(node.rightParenthesis, toNode.rightParenthesis),
-        _isEqualNodes(node.thenStatement, toNode.thenStatement),
-        _isEqualTokens(node.elseKeyword, toNode.elseKeyword),
-        _isEqualNodes(node.elseStatement, toNode.elseStatement));
-  }
-
-  @override
-  bool visitImplementsClause(ImplementsClause node) {
-    ImplementsClause toNode = this._toNode as ImplementsClause;
-    return _and(
-        _isEqualTokens(node.implementsKeyword, toNode.implementsKeyword),
-        _isEqualNodeLists(node.interfaces, toNode.interfaces));
-  }
-
-  @override
-  bool visitImportDirective(ImportDirective node) {
-    ImportDirective toNode = this._toNode as ImportDirective;
-    if (_and(
-        _isEqualNodes(node.documentationComment, toNode.documentationComment),
-        _isEqualNodeLists(node.metadata, toNode.metadata),
-        _isEqualTokens(node.keyword, toNode.keyword),
-        _isEqualNodes(node.uri, toNode.uri),
-        _isEqualTokens(node.asKeyword, toNode.asKeyword),
-        _isEqualNodes(node.prefix, toNode.prefix),
-        _isEqualNodeLists(node.combinators, toNode.combinators),
-        _isEqualTokens(node.semicolon, toNode.semicolon))) {
-      toNode.element = node.element;
-      return true;
-    }
-    return false;
-  }
-
-  @override
-  bool visitIndexExpression(IndexExpression node) {
-    IndexExpression toNode = this._toNode as IndexExpression;
-    if (_and(_isEqualNodes(node.target, toNode.target),
-        _isEqualTokens(node.leftBracket, toNode.leftBracket),
-        _isEqualNodes(node.index, toNode.index),
-        _isEqualTokens(node.rightBracket, toNode.rightBracket))) {
-      toNode.auxiliaryElements = node.auxiliaryElements;
-      toNode.propagatedElement = node.propagatedElement;
-      toNode.propagatedType = node.propagatedType;
-      toNode.staticElement = node.staticElement;
-      toNode.staticType = node.staticType;
-      return true;
-    }
-    return false;
-  }
-
-  @override
-  bool visitInstanceCreationExpression(InstanceCreationExpression node) {
-    InstanceCreationExpression toNode =
-        this._toNode as InstanceCreationExpression;
-    if (_and(_isEqualTokens(node.keyword, toNode.keyword),
-        _isEqualNodes(node.constructorName, toNode.constructorName),
-        _isEqualNodes(node.argumentList, toNode.argumentList))) {
-      toNode.propagatedType = node.propagatedType;
-      toNode.staticElement = node.staticElement;
-      toNode.staticType = node.staticType;
-      return true;
-    }
-    return false;
-  }
-
-  @override
-  bool visitIntegerLiteral(IntegerLiteral node) {
-    IntegerLiteral toNode = this._toNode as IntegerLiteral;
-    if (_and(_isEqualTokens(node.literal, toNode.literal),
-        node.value == toNode.value)) {
-      toNode.propagatedType = node.propagatedType;
-      toNode.staticType = node.staticType;
-      return true;
-    }
-    return false;
-  }
-
-  @override
-  bool visitInterpolationExpression(InterpolationExpression node) {
-    InterpolationExpression toNode = this._toNode as InterpolationExpression;
-    return _and(_isEqualTokens(node.leftBracket, toNode.leftBracket),
-        _isEqualNodes(node.expression, toNode.expression),
-        _isEqualTokens(node.rightBracket, toNode.rightBracket));
-  }
-
-  @override
-  bool visitInterpolationString(InterpolationString node) {
-    InterpolationString toNode = this._toNode as InterpolationString;
-    return _and(_isEqualTokens(node.contents, toNode.contents),
-        node.value == toNode.value);
-  }
-
-  @override
-  bool visitIsExpression(IsExpression node) {
-    IsExpression toNode = this._toNode as IsExpression;
-    if (_and(_isEqualNodes(node.expression, toNode.expression),
-        _isEqualTokens(node.isOperator, toNode.isOperator),
-        _isEqualTokens(node.notOperator, toNode.notOperator),
-        _isEqualNodes(node.type, toNode.type))) {
-      toNode.propagatedType = node.propagatedType;
-      toNode.staticType = node.staticType;
-      return true;
-    }
-    return false;
-  }
-
-  @override
-  bool visitLabel(Label node) {
-    Label toNode = this._toNode as Label;
-    return _and(_isEqualNodes(node.label, toNode.label),
-        _isEqualTokens(node.colon, toNode.colon));
-  }
-
-  @override
-  bool visitLabeledStatement(LabeledStatement node) {
-    LabeledStatement toNode = this._toNode as LabeledStatement;
-    return _and(_isEqualNodeLists(node.labels, toNode.labels),
-        _isEqualNodes(node.statement, toNode.statement));
-  }
-
-  @override
-  bool visitLibraryDirective(LibraryDirective node) {
-    LibraryDirective toNode = this._toNode as LibraryDirective;
-    return _and(
-        _isEqualNodes(node.documentationComment, toNode.documentationComment),
-        _isEqualNodeLists(node.metadata, toNode.metadata),
-        _isEqualTokens(node.libraryKeyword, toNode.libraryKeyword),
-        _isEqualNodes(node.name, toNode.name),
-        _isEqualTokens(node.semicolon, toNode.semicolon));
-  }
-
-  @override
-  bool visitLibraryIdentifier(LibraryIdentifier node) {
-    LibraryIdentifier toNode = this._toNode as LibraryIdentifier;
-    if (_isEqualNodeLists(node.components, toNode.components)) {
-      toNode.propagatedType = node.propagatedType;
-      toNode.staticType = node.staticType;
-      return true;
-    }
-    return false;
-  }
-
-  @override
-  bool visitListLiteral(ListLiteral node) {
-    ListLiteral toNode = this._toNode as ListLiteral;
-    if (_and(_isEqualTokens(node.constKeyword, toNode.constKeyword),
-        _isEqualNodes(node.typeArguments, toNode.typeArguments),
-        _isEqualTokens(node.leftBracket, toNode.leftBracket),
-        _isEqualNodeLists(node.elements, toNode.elements),
-        _isEqualTokens(node.rightBracket, toNode.rightBracket))) {
-      toNode.propagatedType = node.propagatedType;
-      toNode.staticType = node.staticType;
-      return true;
-    }
-    return false;
-  }
-
-  @override
-  bool visitMapLiteral(MapLiteral node) {
-    MapLiteral toNode = this._toNode as MapLiteral;
-    if (_and(_isEqualTokens(node.constKeyword, toNode.constKeyword),
-        _isEqualNodes(node.typeArguments, toNode.typeArguments),
-        _isEqualTokens(node.leftBracket, toNode.leftBracket),
-        _isEqualNodeLists(node.entries, toNode.entries),
-        _isEqualTokens(node.rightBracket, toNode.rightBracket))) {
-      toNode.propagatedType = node.propagatedType;
-      toNode.staticType = node.staticType;
-      return true;
-    }
-    return false;
-  }
-
-  @override
-  bool visitMapLiteralEntry(MapLiteralEntry node) {
-    MapLiteralEntry toNode = this._toNode as MapLiteralEntry;
-    return _and(_isEqualNodes(node.key, toNode.key),
-        _isEqualTokens(node.separator, toNode.separator),
-        _isEqualNodes(node.value, toNode.value));
-  }
-
-  @override
-  bool visitMethodDeclaration(MethodDeclaration node) {
-    MethodDeclaration toNode = this._toNode as MethodDeclaration;
-    return _and(
-        _isEqualNodes(node.documentationComment, toNode.documentationComment),
-        _isEqualNodeLists(node.metadata, toNode.metadata),
-        _isEqualTokens(node.externalKeyword, toNode.externalKeyword),
-        _isEqualTokens(node.modifierKeyword, toNode.modifierKeyword),
-        _isEqualNodes(node.returnType, toNode.returnType),
-        _isEqualTokens(node.propertyKeyword, toNode.propertyKeyword),
-        _isEqualTokens(node.propertyKeyword, toNode.propertyKeyword),
-        _isEqualNodes(node.name, toNode.name),
-        _isEqualNodes(node.parameters, toNode.parameters),
-        _isEqualNodes(node.body, toNode.body));
-  }
-
-  @override
-  bool visitMethodInvocation(MethodInvocation node) {
-    MethodInvocation toNode = this._toNode as MethodInvocation;
-    if (_and(_isEqualNodes(node.target, toNode.target),
-        _isEqualTokens(node.operator, toNode.operator),
-        _isEqualNodes(node.methodName, toNode.methodName),
-        _isEqualNodes(node.argumentList, toNode.argumentList))) {
-      toNode.propagatedType = node.propagatedType;
-      toNode.staticType = node.staticType;
-      return true;
-    }
-    return false;
-  }
-
-  @override
-  bool visitNamedExpression(NamedExpression node) {
-    NamedExpression toNode = this._toNode as NamedExpression;
-    if (_and(_isEqualNodes(node.name, toNode.name),
-        _isEqualNodes(node.expression, toNode.expression))) {
-      toNode.propagatedType = node.propagatedType;
-      toNode.staticType = node.staticType;
-      return true;
-    }
-    return false;
-  }
-
-  @override
-  bool visitNativeClause(NativeClause node) {
-    NativeClause toNode = this._toNode as NativeClause;
-    return _and(_isEqualTokens(node.nativeKeyword, toNode.nativeKeyword),
-        _isEqualNodes(node.name, toNode.name));
-  }
-
-  @override
-  bool visitNativeFunctionBody(NativeFunctionBody node) {
-    NativeFunctionBody toNode = this._toNode as NativeFunctionBody;
-    return _and(_isEqualTokens(node.nativeKeyword, toNode.nativeKeyword),
-        _isEqualNodes(node.stringLiteral, toNode.stringLiteral),
-        _isEqualTokens(node.semicolon, toNode.semicolon));
-  }
-
-  @override
-  bool visitNullLiteral(NullLiteral node) {
-    NullLiteral toNode = this._toNode as NullLiteral;
-    if (_isEqualTokens(node.literal, toNode.literal)) {
-      toNode.propagatedType = node.propagatedType;
-      toNode.staticType = node.staticType;
-      return true;
-    }
-    return false;
-  }
-
-  @override
-  bool visitParenthesizedExpression(ParenthesizedExpression node) {
-    ParenthesizedExpression toNode = this._toNode as ParenthesizedExpression;
-    if (_and(_isEqualTokens(node.leftParenthesis, toNode.leftParenthesis),
-        _isEqualNodes(node.expression, toNode.expression),
-        _isEqualTokens(node.rightParenthesis, toNode.rightParenthesis))) {
-      toNode.propagatedType = node.propagatedType;
-      toNode.staticType = node.staticType;
-      return true;
-    }
-    return false;
-  }
-
-  @override
-  bool visitPartDirective(PartDirective node) {
-    PartDirective toNode = this._toNode as PartDirective;
-    if (_and(
-        _isEqualNodes(node.documentationComment, toNode.documentationComment),
-        _isEqualNodeLists(node.metadata, toNode.metadata),
-        _isEqualTokens(node.partKeyword, toNode.partKeyword),
-        _isEqualNodes(node.uri, toNode.uri),
-        _isEqualTokens(node.semicolon, toNode.semicolon))) {
-      toNode.element = node.element;
-      return true;
-    }
-    return false;
-  }
-
-  @override
-  bool visitPartOfDirective(PartOfDirective node) {
-    PartOfDirective toNode = this._toNode as PartOfDirective;
-    if (_and(
-        _isEqualNodes(node.documentationComment, toNode.documentationComment),
-        _isEqualNodeLists(node.metadata, toNode.metadata),
-        _isEqualTokens(node.partKeyword, toNode.partKeyword),
-        _isEqualTokens(node.ofKeyword, toNode.ofKeyword),
-        _isEqualNodes(node.libraryName, toNode.libraryName),
-        _isEqualTokens(node.semicolon, toNode.semicolon))) {
-      toNode.element = node.element;
-      return true;
-    }
-    return false;
-  }
-
-  @override
-  bool visitPostfixExpression(PostfixExpression node) {
-    PostfixExpression toNode = this._toNode as PostfixExpression;
-    if (_and(_isEqualNodes(node.operand, toNode.operand),
-        _isEqualTokens(node.operator, toNode.operator))) {
-      toNode.propagatedElement = node.propagatedElement;
-      toNode.propagatedType = node.propagatedType;
-      toNode.staticElement = node.staticElement;
-      toNode.staticType = node.staticType;
-      return true;
-    }
-    return false;
-  }
-
-  @override
-  bool visitPrefixedIdentifier(PrefixedIdentifier node) {
-    PrefixedIdentifier toNode = this._toNode as PrefixedIdentifier;
-    if (_and(_isEqualNodes(node.prefix, toNode.prefix),
-        _isEqualTokens(node.period, toNode.period),
-        _isEqualNodes(node.identifier, toNode.identifier))) {
-      toNode.propagatedType = node.propagatedType;
-      toNode.staticType = node.staticType;
-      return true;
-    }
-    return false;
-  }
-
-  @override
-  bool visitPrefixExpression(PrefixExpression node) {
-    PrefixExpression toNode = this._toNode as PrefixExpression;
-    if (_and(_isEqualTokens(node.operator, toNode.operator),
-        _isEqualNodes(node.operand, toNode.operand))) {
-      toNode.propagatedElement = node.propagatedElement;
-      toNode.propagatedType = node.propagatedType;
-      toNode.staticElement = node.staticElement;
-      toNode.staticType = node.staticType;
-      return true;
-    }
-    return false;
-  }
-
-  @override
-  bool visitPropertyAccess(PropertyAccess node) {
-    PropertyAccess toNode = this._toNode as PropertyAccess;
-    if (_and(_isEqualNodes(node.target, toNode.target),
-        _isEqualTokens(node.operator, toNode.operator),
-        _isEqualNodes(node.propertyName, toNode.propertyName))) {
-      toNode.propagatedType = node.propagatedType;
-      toNode.staticType = node.staticType;
-      return true;
-    }
-    return false;
-  }
-
-  @override
-  bool visitRedirectingConstructorInvocation(
-      RedirectingConstructorInvocation node) {
-    RedirectingConstructorInvocation toNode =
-        this._toNode as RedirectingConstructorInvocation;
-    if (_and(_isEqualTokens(node.thisKeyword, toNode.thisKeyword),
-        _isEqualTokens(node.period, toNode.period),
-        _isEqualNodes(node.constructorName, toNode.constructorName),
-        _isEqualNodes(node.argumentList, toNode.argumentList))) {
-      toNode.staticElement = node.staticElement;
-      return true;
-    }
-    return false;
-  }
-
-  @override
-  bool visitRethrowExpression(RethrowExpression node) {
-    RethrowExpression toNode = this._toNode as RethrowExpression;
-    if (_isEqualTokens(node.rethrowKeyword, toNode.rethrowKeyword)) {
-      toNode.propagatedType = node.propagatedType;
-      toNode.staticType = node.staticType;
-      return true;
-    }
-    return false;
-  }
-
-  @override
-  bool visitReturnStatement(ReturnStatement node) {
-    ReturnStatement toNode = this._toNode as ReturnStatement;
-    return _and(_isEqualTokens(node.returnKeyword, toNode.returnKeyword),
-        _isEqualNodes(node.expression, toNode.expression),
-        _isEqualTokens(node.semicolon, toNode.semicolon));
-  }
-
-  @override
-  bool visitScriptTag(ScriptTag node) {
-    ScriptTag toNode = this._toNode as ScriptTag;
-    return _isEqualTokens(node.scriptTag, toNode.scriptTag);
-  }
-
-  @override
-  bool visitShowCombinator(ShowCombinator node) {
-    ShowCombinator toNode = this._toNode as ShowCombinator;
-    return _and(_isEqualTokens(node.keyword, toNode.keyword),
-        _isEqualNodeLists(node.shownNames, toNode.shownNames));
-  }
-
-  @override
-  bool visitSimpleFormalParameter(SimpleFormalParameter node) {
-    SimpleFormalParameter toNode = this._toNode as SimpleFormalParameter;
-    return _and(
-        _isEqualNodes(node.documentationComment, toNode.documentationComment),
-        _isEqualNodeLists(node.metadata, toNode.metadata),
-        _isEqualTokens(node.keyword, toNode.keyword),
-        _isEqualNodes(node.type, toNode.type),
-        _isEqualNodes(node.identifier, toNode.identifier));
-  }
-
-  @override
-  bool visitSimpleIdentifier(SimpleIdentifier node) {
-    SimpleIdentifier toNode = this._toNode as SimpleIdentifier;
-    if (_isEqualTokens(node.token, toNode.token)) {
-      toNode.staticElement = node.staticElement;
-      toNode.staticType = node.staticType;
-      toNode.propagatedElement = node.propagatedElement;
-      toNode.propagatedType = node.propagatedType;
-      toNode.auxiliaryElements = node.auxiliaryElements;
-      return true;
-    }
-    return false;
-  }
-
-  @override
-  bool visitSimpleStringLiteral(SimpleStringLiteral node) {
-    SimpleStringLiteral toNode = this._toNode as SimpleStringLiteral;
-    if (_and(_isEqualTokens(node.literal, toNode.literal),
-        node.value == toNode.value)) {
-      toNode.propagatedType = node.propagatedType;
-      toNode.staticType = node.staticType;
-      return true;
-    }
-    return false;
-  }
-
-  @override
-  bool visitStringInterpolation(StringInterpolation node) {
-    StringInterpolation toNode = this._toNode as StringInterpolation;
-    if (_isEqualNodeLists(node.elements, toNode.elements)) {
-      toNode.propagatedType = node.propagatedType;
-      toNode.staticType = node.staticType;
-      return true;
-    }
-    return false;
-  }
-
-  @override
-  bool visitSuperConstructorInvocation(SuperConstructorInvocation node) {
-    SuperConstructorInvocation toNode =
-        this._toNode as SuperConstructorInvocation;
-    if (_and(_isEqualTokens(node.superKeyword, toNode.superKeyword),
-        _isEqualTokens(node.period, toNode.period),
-        _isEqualNodes(node.constructorName, toNode.constructorName),
-        _isEqualNodes(node.argumentList, toNode.argumentList))) {
-      toNode.staticElement = node.staticElement;
-      return true;
-    }
-    return false;
-  }
-
-  @override
-  bool visitSuperExpression(SuperExpression node) {
-    SuperExpression toNode = this._toNode as SuperExpression;
-    if (_isEqualTokens(node.superKeyword, toNode.superKeyword)) {
-      toNode.propagatedType = node.propagatedType;
-      toNode.staticType = node.staticType;
-      return true;
-    }
-    return false;
-  }
-
-  @override
-  bool visitSwitchCase(SwitchCase node) {
-    SwitchCase toNode = this._toNode as SwitchCase;
-    return _and(_isEqualNodeLists(node.labels, toNode.labels),
-        _isEqualTokens(node.keyword, toNode.keyword),
-        _isEqualNodes(node.expression, toNode.expression),
-        _isEqualTokens(node.colon, toNode.colon),
-        _isEqualNodeLists(node.statements, toNode.statements));
-  }
-
-  @override
-  bool visitSwitchDefault(SwitchDefault node) {
-    SwitchDefault toNode = this._toNode as SwitchDefault;
-    return _and(_isEqualNodeLists(node.labels, toNode.labels),
-        _isEqualTokens(node.keyword, toNode.keyword),
-        _isEqualTokens(node.colon, toNode.colon),
-        _isEqualNodeLists(node.statements, toNode.statements));
-  }
-
-  @override
-  bool visitSwitchStatement(SwitchStatement node) {
-    SwitchStatement toNode = this._toNode as SwitchStatement;
-    return _and(_isEqualTokens(node.switchKeyword, toNode.switchKeyword),
-        _isEqualTokens(node.leftParenthesis, toNode.leftParenthesis),
-        _isEqualNodes(node.expression, toNode.expression),
-        _isEqualTokens(node.rightParenthesis, toNode.rightParenthesis),
-        _isEqualTokens(node.leftBracket, toNode.leftBracket),
-        _isEqualNodeLists(node.members, toNode.members),
-        _isEqualTokens(node.rightBracket, toNode.rightBracket));
-  }
-
-  @override
-  bool visitSymbolLiteral(SymbolLiteral node) {
-    SymbolLiteral toNode = this._toNode as SymbolLiteral;
-    if (_and(_isEqualTokens(node.poundSign, toNode.poundSign),
-        _isEqualTokenLists(node.components, toNode.components))) {
-      toNode.propagatedType = node.propagatedType;
-      toNode.staticType = node.staticType;
-      return true;
-    }
-    return false;
-  }
-
-  @override
-  bool visitThisExpression(ThisExpression node) {
-    ThisExpression toNode = this._toNode as ThisExpression;
-    if (_isEqualTokens(node.thisKeyword, toNode.thisKeyword)) {
-      toNode.propagatedType = node.propagatedType;
-      toNode.staticType = node.staticType;
-      return true;
-    }
-    return false;
-  }
-
-  @override
-  bool visitThrowExpression(ThrowExpression node) {
-    ThrowExpression toNode = this._toNode as ThrowExpression;
-    if (_and(_isEqualTokens(node.throwKeyword, toNode.throwKeyword),
-        _isEqualNodes(node.expression, toNode.expression))) {
-      toNode.propagatedType = node.propagatedType;
-      toNode.staticType = node.staticType;
-      return true;
-    }
-    return false;
-  }
-
-  @override
-  bool visitTopLevelVariableDeclaration(TopLevelVariableDeclaration node) {
-    TopLevelVariableDeclaration toNode =
-        this._toNode as TopLevelVariableDeclaration;
-    return _and(
-        _isEqualNodes(node.documentationComment, toNode.documentationComment),
-        _isEqualNodeLists(node.metadata, toNode.metadata),
-        _isEqualNodes(node.variables, toNode.variables),
-        _isEqualTokens(node.semicolon, toNode.semicolon));
-  }
-
-  @override
-  bool visitTryStatement(TryStatement node) {
-    TryStatement toNode = this._toNode as TryStatement;
-    return _and(_isEqualTokens(node.tryKeyword, toNode.tryKeyword),
-        _isEqualNodes(node.body, toNode.body),
-        _isEqualNodeLists(node.catchClauses, toNode.catchClauses),
-        _isEqualTokens(node.finallyKeyword, toNode.finallyKeyword),
-        _isEqualNodes(node.finallyBlock, toNode.finallyBlock));
-  }
-
-  @override
-  bool visitTypeArgumentList(TypeArgumentList node) {
-    TypeArgumentList toNode = this._toNode as TypeArgumentList;
-    return _and(_isEqualTokens(node.leftBracket, toNode.leftBracket),
-        _isEqualNodeLists(node.arguments, toNode.arguments),
-        _isEqualTokens(node.rightBracket, toNode.rightBracket));
-  }
-
-  @override
-  bool visitTypeName(TypeName node) {
-    TypeName toNode = this._toNode as TypeName;
-    if (_and(_isEqualNodes(node.name, toNode.name),
-        _isEqualNodes(node.typeArguments, toNode.typeArguments))) {
-      toNode.type = node.type;
-      return true;
-    }
-    return false;
-  }
-
-  @override
-  bool visitTypeParameter(TypeParameter node) {
-    TypeParameter toNode = this._toNode as TypeParameter;
-    return _and(
-        _isEqualNodes(node.documentationComment, toNode.documentationComment),
-        _isEqualNodeLists(node.metadata, toNode.metadata),
-        _isEqualNodes(node.name, toNode.name),
-        _isEqualTokens(node.extendsKeyword, toNode.extendsKeyword),
-        _isEqualNodes(node.bound, toNode.bound));
-  }
-
-  @override
-  bool visitTypeParameterList(TypeParameterList node) {
-    TypeParameterList toNode = this._toNode as TypeParameterList;
-    return _and(_isEqualTokens(node.leftBracket, toNode.leftBracket),
-        _isEqualNodeLists(node.typeParameters, toNode.typeParameters),
-        _isEqualTokens(node.rightBracket, toNode.rightBracket));
-  }
-
-  @override
-  bool visitVariableDeclaration(VariableDeclaration node) {
-    VariableDeclaration toNode = this._toNode as VariableDeclaration;
-    return _and(
-        _isEqualNodes(node.documentationComment, toNode.documentationComment),
-        _isEqualNodeLists(node.metadata, toNode.metadata),
-        _isEqualNodes(node.name, toNode.name),
-        _isEqualTokens(node.equals, toNode.equals),
-        _isEqualNodes(node.initializer, toNode.initializer));
-  }
-
-  @override
-  bool visitVariableDeclarationList(VariableDeclarationList node) {
-    VariableDeclarationList toNode = this._toNode as VariableDeclarationList;
-    return _and(
-        _isEqualNodes(node.documentationComment, toNode.documentationComment),
-        _isEqualNodeLists(node.metadata, toNode.metadata),
-        _isEqualTokens(node.keyword, toNode.keyword),
-        _isEqualNodes(node.type, toNode.type),
-        _isEqualNodeLists(node.variables, toNode.variables));
-  }
-
-  @override
-  bool visitVariableDeclarationStatement(VariableDeclarationStatement node) {
-    VariableDeclarationStatement toNode =
-        this._toNode as VariableDeclarationStatement;
-    return _and(_isEqualNodes(node.variables, toNode.variables),
-        _isEqualTokens(node.semicolon, toNode.semicolon));
-  }
-
-  @override
-  bool visitWhileStatement(WhileStatement node) {
-    WhileStatement toNode = this._toNode as WhileStatement;
-    return _and(_isEqualTokens(node.whileKeyword, toNode.whileKeyword),
-        _isEqualTokens(node.leftParenthesis, toNode.leftParenthesis),
-        _isEqualNodes(node.condition, toNode.condition),
-        _isEqualTokens(node.rightParenthesis, toNode.rightParenthesis),
-        _isEqualNodes(node.body, toNode.body));
-  }
-
-  @override
-  bool visitWithClause(WithClause node) {
-    WithClause toNode = this._toNode as WithClause;
-    return _and(_isEqualTokens(node.withKeyword, toNode.withKeyword),
-        _isEqualNodeLists(node.mixinTypes, toNode.mixinTypes));
-  }
-
-  @override
-  bool visitYieldStatement(YieldStatement node) {
-    YieldStatement toNode = this._toNode as YieldStatement;
-    return _and(_isEqualTokens(node.yieldKeyword, toNode.yieldKeyword),
-        _isEqualNodes(node.expression, toNode.expression),
-        _isEqualTokens(node.semicolon, toNode.semicolon));
-  }
-
-  /**
-   * Return `true` if all of the parameters are `true`.
-   */
-  bool _and(bool b1, bool b2, [bool b3 = true, bool b4 = true, bool b5 = true,
-      bool b6 = true, bool b7 = true, bool b8 = true, bool b9 = true,
-      bool b10 = true, bool b11 = true, bool b12 = true, bool b13 = true]) {
-    // TODO(brianwilkerson) Inline this method.
-    return b1 &&
-        b2 &&
-        b3 &&
-        b4 &&
-        b5 &&
-        b6 &&
-        b7 &&
-        b8 &&
-        b9 &&
-        b10 &&
-        b11 &&
-        b12 &&
-        b13;
-  }
-
-  /**
-   * Return `true` if the [first] and [second] lists of AST nodes have the same
-   * size and corresponding elements are equal.
-   */
-  bool _isEqualNodeLists(NodeList first, NodeList second) {
-    if (first == null) {
-      return second == null;
-    } else if (second == null) {
-      return false;
-    }
-    int size = first.length;
-    if (second.length != size) {
-      return false;
-    }
-    bool equal = true;
-    for (int i = 0; i < size; i++) {
-      if (!_isEqualNodes(first[i], second[i])) {
-        equal = false;
-      }
-    }
-    return equal;
-  }
-
-  /**
-   * Return `true` if the [fromNode] and [toNode] have the same structure. As a
-   * side-effect, if the nodes do have the same structure, any resolution data
-   * from the first node will be copied to the second node.
-   */
-  bool _isEqualNodes(AstNode fromNode, AstNode toNode) {
-    if (fromNode == null) {
-      return toNode == null;
-    } else if (toNode == null) {
-      return false;
-    } else if (fromNode.runtimeType == toNode.runtimeType) {
-      this._toNode = toNode;
-      return fromNode.accept(this);
-    }
-    //
-    // Check for a simple transformation caused by entering a period.
-    //
-    if (toNode is PrefixedIdentifier) {
-      SimpleIdentifier prefix = toNode.prefix;
-      if (fromNode.runtimeType == prefix.runtimeType) {
-        this._toNode = prefix;
-        return fromNode.accept(this);
-      }
-    } else if (toNode is PropertyAccess) {
-      Expression target = toNode.target;
-      if (fromNode.runtimeType == target.runtimeType) {
-        this._toNode = target;
-        return fromNode.accept(this);
-      }
-    }
-    return false;
-  }
-
-  /**
-   * Return `true` if the [first] and [second] arrays of tokens have the same
-   * length and corresponding elements are equal.
-   */
-  bool _isEqualTokenLists(List<Token> first, List<Token> second) {
-    int length = first.length;
-    if (second.length != length) {
-      return false;
-    }
-    for (int i = 0; i < length; i++) {
-      if (!_isEqualTokens(first[i], second[i])) {
-        return false;
-      }
-    }
-    return true;
-  }
-
-  /**
-   * Return `true` if the [first] and [second] tokens have the same structure.
-   */
-  bool _isEqualTokens(Token first, Token second) {
-    if (first == null) {
-      return second == null;
-    } else if (second == null) {
-      return false;
-    }
-    return first.lexeme == second.lexeme;
-  }
-
-  /**
-   * Copy resolution data from the [fromNode] to the [toNode].
-   */
-  static void copyResolutionData(AstNode fromNode, AstNode toNode) {
-    ResolutionCopier copier = new ResolutionCopier();
-    copier._isEqualNodes(fromNode, toNode);
-  }
-}