Rename analyzer_experimental to analyzer.

pkg/analyzer_experimental/lib/src/generated/parser.dart

-// 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 'java_core.dart';
-import 'instrumentation.dart';
-import 'error.dart';
-import 'source.dart';
-import 'scanner.dart';
-import 'ast.dart';
-import 'utilities_dart.dart';
-import 'engine.dart' show AnalysisEngine;
-/**
- * Instances of the class `CommentAndMetadata` implement a simple data-holder for a method
- * that needs to return multiple values.
- *
- * @coverage dart.engine.parser
- */
-class CommentAndMetadata {
-
-  /**
-   * The documentation comment that was parsed, or `null` if none was given.
-   */
-  Comment comment;
-
-  /**
-   * The metadata that was parsed.
-   */
-  List<Annotation> metadata;
-
-  /**
-   * Initialize a newly created holder with the given data.
-   *
-   * @param comment the documentation comment that was parsed
-   * @param metadata the metadata that was parsed
-   */
-  CommentAndMetadata(Comment comment, List<Annotation> metadata) {
-    this.comment = comment;
-    this.metadata = metadata;
-  }
-}
-/**
- * Instances of the class `FinalConstVarOrType` implement a simple data-holder for a method
- * that needs to return multiple values.
- *
- * @coverage dart.engine.parser
- */
-class FinalConstVarOrType {
-
-  /**
-   * The 'final', 'const' or 'var' keyword, or `null` if none was given.
-   */
-  Token keyword;
-
-  /**
-   * The type, of `null` if no type was specified.
-   */
-  TypeName type;
-
-  /**
-   * Initialize a newly created holder with the given data.
-   *
-   * @param keyword the 'final', 'const' or 'var' keyword
-   * @param type the type
-   */
-  FinalConstVarOrType(Token keyword, TypeName type) {
-    this.keyword = keyword;
-    this.type = type;
-  }
-}
-/**
- * Instances of the class `Modifiers` implement a simple data-holder for a method that needs
- * to return multiple values.
- *
- * @coverage dart.engine.parser
- */
-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;
-  String toString() {
-    JavaStringBuilder builder = new JavaStringBuilder();
-    bool needsSpace = appendKeyword(builder, false, abstractKeyword);
-    needsSpace = appendKeyword(builder, needsSpace, constKeyword);
-    needsSpace = appendKeyword(builder, needsSpace, externalKeyword);
-    needsSpace = appendKeyword(builder, needsSpace, factoryKeyword);
-    needsSpace = appendKeyword(builder, needsSpace, finalKeyword);
-    needsSpace = appendKeyword(builder, needsSpace, staticKeyword);
-    appendKeyword(builder, needsSpace, varKeyword);
-    return builder.toString();
-  }
-
-  /**
-   * If the given keyword is not `null`, append it to the given builder, prefixing it with a
-   * space if needed.
-   *
-   * @param builder the builder to which the keyword will be appended
-   * @param needsSpace `true` if the keyword needs to be prefixed with a space
-   * @param keyword the keyword to be appended
-   * @return `true` if subsequent keywords need to be prefixed with a space
-   */
-  bool appendKeyword(JavaStringBuilder builder, bool needsSpace, Token keyword) {
-    if (keyword != null) {
-      if (needsSpace) {
-        builder.appendChar(0x20);
-      }
-      builder.append(keyword.lexeme);
-      return true;
-    }
-    return needsSpace;
-  }
-}
-/**
- * Instances of the class `Parser` are used to parse tokens into an AST structure.
- *
- * @coverage dart.engine.parser
- */
-class Parser {
-
-  /**
-   * The source being parsed.
-   */
-  Source _source;
-
-  /**
-   * The error listener that will be informed of any errors that are found during the parse.
-   */
-  AnalysisErrorListener _errorListener;
-
-  /**
-   * The next token to be parsed.
-   */
-  Token _currentToken;
-
-  /**
-   * 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;
-  static String _HIDE = "hide";
-  static String _OF = "of";
-  static String _ON = "on";
-  static String _SHOW = "show";
-  static String _NATIVE = "native";
-
-  /**
-   * Initialize a newly created parser.
-   *
-   * @param source the source being parsed
-   * @param errorListener the error listener that will be informed of any errors that are found
-   *          during the parse
-   */
-  Parser(Source source, AnalysisErrorListener errorListener) {
-    this._source = source;
-    this._errorListener = errorListener;
-  }
-
-  /**
-   * Parse a compilation unit, starting with the given token.
-   *
-   * @param token the first token of the compilation unit
-   * @return the compilation unit that was parsed
-   */
-  CompilationUnit parseCompilationUnit(Token token) {
-    InstrumentationBuilder instrumentation = Instrumentation.builder2("dart.engine.Parser.parseCompilationUnit");
-    try {
-      _currentToken = token;
-      CompilationUnit compilationUnit = parseCompilationUnit2();
-      gatherTodoComments(token);
-      return compilationUnit;
-    } finally {
-      instrumentation.log2(2);
-    }
-  }
-
-  /**
-   * Parse an expression, starting with the given token.
-   *
-   * @param token the first token of the expression
-   * @return the expression that was parsed, or `null` if the tokens do not represent a
-   *         recognizable expression
-   */
-  Expression parseExpression(Token token) {
-    InstrumentationBuilder instrumentation = Instrumentation.builder2("dart.engine.Parser.parseExpression");
-    try {
-      _currentToken = token;
-      return parseExpression2();
-    } finally {
-      instrumentation.log();
-    }
-  }
-
-  /**
-   * Parse a statement, starting with the given token.
-   *
-   * @param token the first token of the statement
-   * @return the statement that was parsed, or `null` if the tokens do not represent a
-   *         recognizable statement
-   */
-  Statement parseStatement(Token token) {
-    InstrumentationBuilder instrumentation = Instrumentation.builder2("dart.engine.Parser.parseStatement");
-    try {
-      _currentToken = token;
-      return parseStatement2();
-    } finally {
-      instrumentation.log();
-    }
-  }
-
-  /**
-   * Parse a sequence of statements, starting with the given token.
-   *
-   * @param token the first token of the sequence of statement
-   * @return the statements that were parsed, or `null` if the tokens do not represent a
-   *         recognizable sequence of statements
-   */
-  List<Statement> parseStatements(Token token) {
-    InstrumentationBuilder instrumentation = Instrumentation.builder2("dart.engine.Parser.parseStatements");
-    try {
-      _currentToken = token;
-      return parseStatements2();
-    } finally {
-      instrumentation.log();
-    }
-  }
-  void set currentToken(Token currentToken) {
-    this._currentToken = currentToken;
-  }
-
-  /**
-   * Advance to the next token in the token stream.
-   */
-  void advance() {
-    _currentToken = _currentToken.next;
-  }
-
-  /**
-   * Append the character equivalent of the given scalar value to the given builder. Use the start
-   * and end indices to report an error, and don't append anything to the builder, if the scalar
-   * value is invalid.
-   *
-   * @param builder the builder to which the scalar value is to be appended
-   * @param escapeSequence the escape sequence that was parsed to produce the scalar value
-   * @param scalarValue the value to be appended
-   * @param startIndex the index of the first character representing the scalar value
-   * @param endIndex the index of the last character representing the scalar value
-   */
-  void appendScalarValue(JavaStringBuilder builder, String escapeSequence, int scalarValue, int startIndex, int endIndex) {
-    if (scalarValue < 0 || scalarValue > Character.MAX_CODE_POINT || (scalarValue >= 0xD800 && scalarValue <= 0xDFFF)) {
-      reportError8(ParserErrorCode.INVALID_CODE_POINT, [escapeSequence]);
-      return;
-    }
-    if (scalarValue < Character.MAX_VALUE) {
-      builder.appendChar(scalarValue as int);
-    } else {
-      builder.append(Character.toChars(scalarValue));
-    }
-  }
-
-  /**
-   * Compute the content of a string with the given literal representation.
-   *
-   * @param lexeme the literal representation of the string
-   * @param first `true` if this is the first token in a string literal
-   * @param last `true` if this is the last token in a string literal
-   * @return the actual value of the string
-   */
-  String computeStringValue(String lexeme, bool first, bool last) {
-    bool isRaw = false;
-    int start = 0;
-    if (first) {
-      if (lexeme.startsWith("r\"\"\"") || lexeme.startsWith("r'''")) {
-        isRaw = true;
-        start += 4;
-      } else if (lexeme.startsWith("r\"") || lexeme.startsWith("r'")) {
-        isRaw = true;
-        start += 2;
-      } else if (lexeme.startsWith("\"\"\"") || lexeme.startsWith("'''")) {
-        start += 3;
-      } else if (lexeme.startsWith("\"") || lexeme.startsWith("'")) {
-        start += 1;
-      }
-    }
-    int end = lexeme.length;
-    if (last) {
-      if (lexeme.endsWith("\"\"\"") || lexeme.endsWith("'''")) {
-        end -= 3;
-      } else if (lexeme.endsWith("\"") || lexeme.endsWith("'")) {
-        end -= 1;
-      }
-    }
-    if (end - start + 1 < 0) {
-      AnalysisEngine.instance.logger.logError("Internal error: computeStringValue(${lexeme}, ${first}, ${last})");
-      return "";
-    }
-    if (isRaw) {
-      return lexeme.substring(start, end);
-    }
-    JavaStringBuilder builder = new JavaStringBuilder();
-    int index = start;
-    while (index < end) {
-      index = translateCharacter(builder, lexeme, index);
-    }
-    return builder.toString();
-  }
-
-  /**
-   * Convert the given method declaration into the nearest valid top-level function declaration.
-   *
-   * @param method the method to be converted
-   * @return the function declaration that most closely captures the components of the given method
-   *         declaration
-   */
-  FunctionDeclaration convertToFunctionDeclaration(MethodDeclaration method) => new FunctionDeclaration.full(method.documentationComment, method.metadata, method.externalKeyword, method.returnType, method.propertyKeyword, method.name, new FunctionExpression.full(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.
-   *
-   * @return `true` if the current token could be the start of a compilation unit member
-   */
-  bool couldBeStartOfCompilationUnitMember() {
-    if ((matches(Keyword.IMPORT) || matches(Keyword.EXPORT) || matches(Keyword.LIBRARY) || matches(Keyword.PART)) && !matches4(peek(), TokenType.PERIOD) && !matches4(peek(), TokenType.LT)) {
-      return true;
-    } else if (matches(Keyword.CLASS)) {
-      return true;
-    } else if (matches(Keyword.TYPEDEF) && !matches4(peek(), TokenType.PERIOD) && !matches4(peek(), TokenType.LT)) {
-      return true;
-    } else if (matches(Keyword.VOID) || ((matches(Keyword.GET) || matches(Keyword.SET)) && matchesIdentifier2(peek())) || (matches(Keyword.OPERATOR) && isOperator(peek()))) {
-      return true;
-    } else if (matchesIdentifier()) {
-      if (matches4(peek(), TokenType.OPEN_PAREN)) {
-        return true;
-      }
-      Token token = skipReturnType(_currentToken);
-      if (token == null) {
-        return false;
-      }
-      if (matches(Keyword.GET) || matches(Keyword.SET) || (matches(Keyword.OPERATOR) && isOperator(peek())) || matchesIdentifier()) {
-        return true;
-      }
-    }
-    return false;
-  }
-
-  /**
-   * Create a synthetic identifier.
-   *
-   * @return the synthetic identifier that was created
-   */
-  SimpleIdentifier createSyntheticIdentifier() => new SimpleIdentifier.full(createSyntheticToken2(TokenType.IDENTIFIER));
-
-  /**
-   * Create a synthetic string literal.
-   *
-   * @return the synthetic string literal that was created
-   */
-  SimpleStringLiteral createSyntheticStringLiteral() => new SimpleStringLiteral.full(createSyntheticToken2(TokenType.STRING), "");
-
-  /**
-   * Create a synthetic token representing the given keyword.
-   *
-   * @return the synthetic token that was created
-   */
-  Token createSyntheticToken(Keyword keyword) => new Parser_SyntheticKeywordToken(keyword, _currentToken.offset);
-
-  /**
-   * Create a synthetic token with the given type.
-   *
-   * @return the synthetic token that was created
-   */
-  Token createSyntheticToken2(TokenType type) => new StringToken(type, "", _currentToken.offset);
-
-  /**
-   * Check that the given expression is assignable and report an error if it isn't.
-   *
-   * <pre>
-   * assignableExpression ::=
-   *     primary (arguments* assignableSelector)+
-   *   | 'super' assignableSelector
-   *   | identifier
-   *
-   * assignableSelector ::=
-   *     '[' expression ']'
-   *   | '.' identifier
-   * </pre>
-   *
-   * @param expression the expression being checked
-   */
-  void ensureAssignable(Expression expression) {
-    if (expression != null && !expression.isAssignable) {
-      reportError8(ParserErrorCode.ILLEGAL_ASSIGNMENT_TO_NON_ASSIGNABLE, []);
-    }
-  }
-
-  /**
-   * If the current token is a keyword matching the given string, return it after advancing to the
-   * next token. Otherwise report an error and return the current token without advancing.
-   *
-   * @param keyword the keyword that is expected
-   * @return the token that matched the given type
-   */
-  Token expect(Keyword keyword) {
-    if (matches(keyword)) {
-      return andAdvance;
-    }
-    reportError8(ParserErrorCode.EXPECTED_TOKEN, [keyword.syntax]);
-    return _currentToken;
-  }
-
-  /**
-   * 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.
-   *
-   * @param type the type of token that is expected
-   * @return the token that matched the given type
-   */
-  Token expect2(TokenType type) {
-    if (matches5(type)) {
-      return andAdvance;
-    }
-    if (identical(type, TokenType.SEMICOLON)) {
-      reportError9(ParserErrorCode.EXPECTED_TOKEN, _currentToken.previous, [type.lexeme]);
-    } else {
-      reportError8(ParserErrorCode.EXPECTED_TOKEN, [type.lexeme]);
-    }
-    return _currentToken;
-  }
-
-  /**
-   * 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.
-   *
-   * @param ranges the ranges to be searched
-   * @param index the index contained in the returned range
-   * @return the range that was found
-   */
-  List<int> findRange(List<List<int>> ranges, int index) {
-    for (List<int> range in ranges) {
-      if (range[0] <= index && index <= range[1]) {
-        return range;
-      } else if (index < range[0]) {
-        return null;
-      }
-    }
-    return null;
-  }
-  void gatherTodoComments(Token token) {
-    while (token != null && token.type != TokenType.EOF) {
-      Token commentToken = token.precedingComments;
-      while (commentToken != null) {
-        if (identical(commentToken.type, TokenType.SINGLE_LINE_COMMENT) || identical(commentToken.type, TokenType.MULTI_LINE_COMMENT)) {
-          scrapeTodoComment(commentToken);
-        }
-        commentToken = commentToken.next;
-      }
-      token = token.next;
-    }
-  }
-
-  /**
-   * Advance to the next token in the token stream, making it the new current token.
-   *
-   * @return the token that was current before this method was invoked
-   */
-  Token get andAdvance {
-    Token token = _currentToken;
-    advance();
-    return token;
-  }
-
-  /**
-   * Return a list of the ranges of characters in the given comment string that should be treated as
-   * code blocks.
-   *
-   * @param comment the comment being processed
-   * @return the ranges of characters 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;
-    int index = 0;
-    if (comment.startsWith("/**") || comment.startsWith("///")) {
-      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 (JavaString.startsWithBefore(comment, "*     ", index)) {
-          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 (JavaString.startsWithBefore(comment, "[:", index)) {
-        int end = JavaString.indexOf(comment, ":]", index + 2);
-        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 begin token, or `null` if either the given
-   * token is not a begin token or it does not have an end token associated with it.
-   *
-   * @param beginToken the token that is expected to have an end token associated with it
-   * @return the end token associated with the begin token
-   */
-  Token getEndToken(Token beginToken) {
-    if (beginToken is BeginToken) {
-      return ((beginToken as BeginToken)).endToken;
-    }
-    return null;
-  }
-
-  /**
-   * 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.
-   *
-   * @return `true` if we can successfully parse the rest of a type alias if we first parse a
-   *         return type.
-   */
-  bool hasReturnTypeInTypeAlias() {
-    Token next = skipReturnType(_currentToken);
-    if (next == null) {
-      return false;
-    }
-    return matchesIdentifier2(next);
-  }
-
-  /**
-   * Return `true` if the current token appears to be the beginning of a function declaration.
-   *
-   * @return `true` if the current token appears to be the beginning of a function declaration
-   */
-  bool isFunctionDeclaration() {
-    if (matches(Keyword.VOID)) {
-      return true;
-    }
-    Token afterReturnType = skipTypeName(_currentToken);
-    if (afterReturnType == null) {
-      afterReturnType = _currentToken;
-    }
-    Token afterIdentifier = skipSimpleIdentifier(afterReturnType);
-    if (afterIdentifier == null) {
-      afterIdentifier = skipSimpleIdentifier(_currentToken);
-    }
-    if (afterIdentifier == null) {
-      return false;
-    }
-    if (isFunctionExpression(afterIdentifier)) {
-      return true;
-    }
-    if (matches(Keyword.GET)) {
-      Token afterName = skipSimpleIdentifier(_currentToken.next);
-      if (afterName == null) {
-        return false;
-      }
-      return matches4(afterName, TokenType.FUNCTION) || matches4(afterName, TokenType.OPEN_CURLY_BRACKET);
-    }
-    return false;
-  }
-
-  /**
-   * Return `true` if the given token appears to be the beginning of a function expression.
-   *
-   * @param startToken the token that might be the start of a function expression
-   * @return `true` if the given token appears to be the beginning of a function expression
-   */
-  bool isFunctionExpression(Token startToken) {
-    Token afterParameters = skipFormalParameterList(startToken);
-    if (afterParameters == null) {
-      return false;
-    }
-    return matchesAny(afterParameters, [TokenType.OPEN_CURLY_BRACKET, TokenType.FUNCTION]);
-  }
-
-  /**
-   * Return `true` if the given character is a valid hexadecimal digit.
-   *
-   * @param character the character being tested
-   * @return `true` if the 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.
-   *
-   * <pre>
-   * initializedVariableDeclaration ::=
-   *     declaredIdentifier ('=' expression)? (',' initializedIdentifier)*
-   *
-   * declaredIdentifier ::=
-   *     metadata finalConstVarOrType identifier
-   *
-   * finalConstVarOrType ::=
-   *     'final' type?
-   *   | 'const' type?
-   *   | 'var'
-   *   | type
-   *
-   * type ::=
-   *     qualified typeArguments?
-   *
-   * initializedIdentifier ::=
-   *     identifier ('=' expression)?
-   * </pre>
-   *
-   * @return `true` if the current token is the first token in an initialized variable
-   *         declaration
-   */
-  bool isInitializedVariableDeclaration() {
-    if (matches(Keyword.FINAL) || matches(Keyword.VAR)) {
-      return true;
-    }
-    if (matches(Keyword.CONST)) {
-      return !matchesAny(peek(), [
-          TokenType.LT,
-          TokenType.OPEN_CURLY_BRACKET,
-          TokenType.OPEN_SQUARE_BRACKET,
-          TokenType.INDEX]);
-    }
-    Token token = skipTypeName(_currentToken);
-    if (token == null) {
-      return false;
-    }
-    token = skipSimpleIdentifier(token);
-    if (token == null) {
-      return false;
-    }
-    TokenType type = token.type;
-    return identical(type, TokenType.EQ) || identical(type, TokenType.COMMA) || identical(type, TokenType.SEMICOLON) || matches3(token, Keyword.IN);
-  }
-
-  /**
-   * Given that we have just found bracketed text within a 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.
-   *
-   * This method uses the syntax described by the <a
-   * href="http://daringfireball.net/projects/markdown/syntax">markdown</a> project.
-   *
-   * @param comment the comment text in which the bracketed text was found
-   * @param rightIndex the index of the right bracket
-   * @return `true` if the bracketed text is followed by a link address
-   */
-  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 token appears to be the beginning of an operator declaration.
-   *
-   * @param startToken the token that might be the start of an operator declaration
-   * @return `true` if the given token appears to be the beginning of an operator declaration
-   */
-  bool isOperator(Token startToken) {
-    if (startToken.isOperator) {
-      Token token = startToken.next;
-      while (token.isOperator) {
-        token = token.next;
-      }
-      return matches4(token, TokenType.OPEN_PAREN);
-    }
-    return false;
-  }
-
-  /**
-   * Return `true` if the current token appears to be the beginning of a switch member.
-   *
-   * @return `true` if the current token appears to be the beginning of a switch member
-   */
-  bool isSwitchMember() {
-    Token token = _currentToken;
-    while (matches4(token, TokenType.IDENTIFIER) && matches4(token.next, TokenType.COLON)) {
-      token = token.next.next;
-    }
-    if (identical(token.type, TokenType.KEYWORD)) {
-      Keyword keyword = ((token as KeywordToken)).keyword;
-      return identical(keyword, Keyword.CASE) || identical(keyword, Keyword.DEFAULT);
-    }
-    return false;
-  }
-
-  /**
-   * Return `true` if the given token appears to be the first token of a type name that is
-   * followed by a variable or field formal parameter.
-   *
-   * @param startToken the first token of the sequence being checked
-   * @return `true` if there is a type name and variable starting at the given token
-   */
-  bool isTypedIdentifier(Token startToken) {
-    Token token = skipReturnType(startToken);
-    if (token == null) {
-      return false;
-    } else if (matchesIdentifier2(token)) {
-      return true;
-    } else if (matches3(token, Keyword.THIS) && matches4(token.next, TokenType.PERIOD) && matchesIdentifier2(token.next.next)) {
-      return true;
-    }
-    return false;
-  }
-
-  /**
-   * Compare the given tokens to find the token that appears first in the source being parsed. That
-   * is, return the left-most of all of the tokens. The arguments are allowed to be `null`.
-   * Return the token with the smallest offset, or `null` if there are no arguments or if all
-   * of the arguments are `null`.
-   *
-   * @param tokens the tokens being compared
-   * @return the token with the smallest offset
-   */
-  Token lexicallyFirst(List<Token> tokens) {
-    Token first = null;
-    int firstOffset = 2147483647;
-    for (Token token in tokens) {
-      if (token != null) {
-        int offset = token.offset;
-        if (offset < firstOffset) {
-          first = token;
-          firstOffset = offset;
-        }
-      }
-    }
-    return first;
-  }
-
-  /**
-   * Return `true` if the current token matches the given keyword.
-   *
-   * @param keyword the keyword that can optionally appear in the current location
-   * @return `true` if the current token matches the given keyword
-   */
-  bool matches(Keyword keyword) => matches3(_currentToken, keyword);
-
-  /**
-   * Return `true` if the current token matches the given identifier.
-   *
-   * @param identifier the identifier that can optionally appear in the current location
-   * @return `true` if the current token matches the given identifier
-   */
-  bool matches2(String identifier) => identical(_currentToken.type, TokenType.IDENTIFIER) && _currentToken.lexeme == identifier;
-
-  /**
-   * Return `true` if the given token matches the given keyword.
-   *
-   * @param token the token being tested
-   * @param keyword the keyword that is being tested for
-   * @return `true` if the given token matches the given keyword
-   */
-  bool matches3(Token token, Keyword keyword) => identical(token.type, TokenType.KEYWORD) && identical(((token as KeywordToken)).keyword, keyword);
-
-  /**
-   * Return `true` if the given token has the given type.
-   *
-   * @param token the token being tested
-   * @param type the type of token that is being tested for
-   * @return `true` if the given token has the given type
-   */
-  bool matches4(Token token, TokenType type) => identical(token.type, type);
-
-  /**
-   * Return `true` if the current token has the given type. Note that this method, unlike
-   * other variants, will modify the token stream if possible to match a wider range of tokens. In
-   * particular, if we are attempting to match a '>' and the next token is either a '>>' or '>>>',
-   * the token stream will be re-written and `true` will be returned.
-   *
-   * @param type the type of token that can optionally appear in the current location
-   * @return `true` if the current token has the given type
-   */
-  bool matches5(TokenType type) {
-    TokenType currentType = _currentToken.type;
-    if (currentType != type) {
-      if (identical(type, TokenType.GT)) {
-        if (identical(currentType, TokenType.GT_GT)) {
-          int offset = _currentToken.offset;
-          Token first = new Token(TokenType.GT, offset);
-          Token second = new Token(TokenType.GT, offset + 1);
-          second.setNext(_currentToken.next);
-          first.setNext(second);
-          _currentToken.previous.setNext(first);
-          _currentToken = first;
-          return true;
-        } else if (identical(currentType, TokenType.GT_EQ)) {
-          int offset = _currentToken.offset;
-          Token first = new Token(TokenType.GT, offset);
-          Token second = new Token(TokenType.EQ, offset + 1);
-          second.setNext(_currentToken.next);
-          first.setNext(second);
-          _currentToken.previous.setNext(first);
-          _currentToken = first;
-          return true;
-        } else if (identical(currentType, TokenType.GT_GT_EQ)) {
-          int offset = _currentToken.offset;
-          Token first = new Token(TokenType.GT, offset);
-          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;
-  }
-
-  /**
-   * Return `true` if the given token has any one of the given types.
-   *
-   * @param token the token being tested
-   * @param types the types of token that are being tested for
-   * @return `true` if the given token has any of the given types
-   */
-  bool matchesAny(Token token, List<TokenType> types) {
-    TokenType actualType = token.type;
-    for (TokenType type in types) {
-      if (identical(actualType, type)) {
-        return true;
-      }
-    }
-    return false;
-  }
-
-  /**
-   * Return `true` if the current token is a valid identifier. Valid identifiers include
-   * built-in identifiers (pseudo-keywords).
-   *
-   * @return `true` if the current token is a valid identifier
-   */
-  bool matchesIdentifier() => matchesIdentifier2(_currentToken);
-
-  /**
-   * Return `true` if the given token is a valid identifier. Valid identifiers include
-   * built-in identifiers (pseudo-keywords).
-   *
-   * @return `true` if the given token is a valid identifier
-   */
-  bool matchesIdentifier2(Token token) => matches4(token, TokenType.IDENTIFIER) || (matches4(token, TokenType.KEYWORD) && ((token as KeywordToken)).keyword.isPseudoKeyword);
-
-  /**
-   * If the current token has the given type, then advance to the next token and return `true`
-   * . Otherwise, return `false` without advancing.
-   *
-   * @param type the type of token that can optionally appear in the current location
-   * @return `true` if the current token has the given type
-   */
-  bool optional(TokenType type) {
-    if (matches5(type)) {
-      advance();
-      return true;
-    }
-    return false;
-  }
-
-  /**
-   * Parse an additive expression.
-   *
-   * <pre>
-   * additiveExpression ::=
-   *     multiplicativeExpression (additiveOperator multiplicativeExpression)*
-   *   | 'super' (additiveOperator multiplicativeExpression)+
-   * </pre>
-   *
-   * @return the additive expression that was parsed
-   */
-  Expression parseAdditiveExpression() {
-    Expression expression;
-    if (matches(Keyword.SUPER) && _currentToken.next.type.isAdditiveOperator) {
-      expression = new SuperExpression.full(andAdvance);
-    } else {
-      expression = parseMultiplicativeExpression();
-    }
-    while (_currentToken.type.isAdditiveOperator) {
-      Token operator = andAdvance;
-      expression = new BinaryExpression.full(expression, operator, parseMultiplicativeExpression());
-    }
-    return expression;
-  }
-
-  /**
-   * Parse an annotation.
-   *
-   * <pre>
-   * annotation ::=
-   *     '@' qualified ('.' identifier)? arguments?
-   * </pre>
-   *
-   * @return the annotation that was parsed
-   */
-  Annotation parseAnnotation() {
-    Token atSign = expect2(TokenType.AT);
-    Identifier name = parsePrefixedIdentifier();
-    Token period = null;
-    SimpleIdentifier constructorName = null;
-    if (matches5(TokenType.PERIOD)) {
-      period = andAdvance;
-      constructorName = parseSimpleIdentifier();
-    }
-    ArgumentList arguments = null;
-    if (matches5(TokenType.OPEN_PAREN)) {
-      arguments = parseArgumentList();
-    }
-    return new Annotation.full(atSign, name, period, constructorName, arguments);
-  }
-
-  /**
-   * Parse an argument.
-   *
-   * <pre>
-   * argument ::=
-   *     namedArgument
-   *   | expression
-   *
-   * namedArgument ::=
-   *     label expression
-   * </pre>
-   *
-   * @return the argument that was parsed
-   */
-  Expression parseArgument() {
-    if (matchesIdentifier() && matches4(peek(), TokenType.COLON)) {
-      SimpleIdentifier label = new SimpleIdentifier.full(andAdvance);
-      Label name = new Label.full(label, andAdvance);
-      return new NamedExpression.full(name, parseExpression2());
-    } else {
-      return parseExpression2();
-    }
-  }
-
-  /**
-   * Parse an argument definition test.
-   *
-   * <pre>
-   * argumentDefinitionTest ::=
-   *     '?' identifier
-   * </pre>
-   *
-   * @return the argument definition test that was parsed
-   */
-  ArgumentDefinitionTest parseArgumentDefinitionTest() {
-    Token question = expect2(TokenType.QUESTION);
-    SimpleIdentifier identifier = parseSimpleIdentifier();
-    reportError9(ParserErrorCode.DEPRECATED_ARGUMENT_DEFINITION_TEST, question, []);
-    return new ArgumentDefinitionTest.full(question, identifier);
-  }
-
-  /**
-   * Parse a list of arguments.
-   *
-   * <pre>
-   * arguments ::=
-   *     '(' argumentList? ')'
-   *
-   * argumentList ::=
-   *     namedArgument (',' namedArgument)*
-   *   | expressionList (',' namedArgument)*
-   * </pre>
-   *
-   * @return the argument list that was parsed
-   */
-  ArgumentList parseArgumentList() {
-    Token leftParenthesis = expect2(TokenType.OPEN_PAREN);
-    List<Expression> arguments = new List<Expression>();
-    if (matches5(TokenType.CLOSE_PAREN)) {
-      return new ArgumentList.full(leftParenthesis, arguments, andAdvance);
-    }
-    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) {
-        if (!generatedError && argument is! NamedExpression) {
-          reportError8(ParserErrorCode.POSITIONAL_AFTER_NAMED_ARGUMENT, []);
-          generatedError = true;
-        }
-      } else if (argument is NamedExpression) {
-        foundNamedArgument = true;
-      }
-    }
-    Token rightParenthesis = expect2(TokenType.CLOSE_PAREN);
-    return new ArgumentList.full(leftParenthesis, arguments, rightParenthesis);
-  }
-
-  /**
-   * Parse an assert statement.
-   *
-   * <pre>
-   * assertStatement ::=
-   *     'assert' '(' conditionalExpression ')' ';'
-   * </pre>
-   *
-   * @return the assert statement
-   */
-  AssertStatement parseAssertStatement() {
-    Token keyword = expect(Keyword.ASSERT);
-    Token leftParen = expect2(TokenType.OPEN_PAREN);
-    Expression expression = parseExpression2();
-    if (expression is AssignmentExpression) {
-      reportError(ParserErrorCode.ASSERT_DOES_NOT_TAKE_ASSIGNMENT, expression, []);
-    } else if (expression is CascadeExpression) {
-      reportError(ParserErrorCode.ASSERT_DOES_NOT_TAKE_CASCADE, expression, []);
-    } else if (expression is ThrowExpression) {
-      reportError(ParserErrorCode.ASSERT_DOES_NOT_TAKE_THROW, expression, []);
-    } else if (expression is RethrowExpression) {
-      reportError(ParserErrorCode.ASSERT_DOES_NOT_TAKE_RETHROW, expression, []);
-    }
-    Token rightParen = expect2(TokenType.CLOSE_PAREN);
-    Token semicolon = expect2(TokenType.SEMICOLON);
-    return new AssertStatement.full(keyword, leftParen, expression, rightParen, semicolon);
-  }
-
-  /**
-   * Parse an assignable expression.
-   *
-   * <pre>
-   * assignableExpression ::=
-   *     primary (arguments* assignableSelector)+
-   *   | 'super' assignableSelector
-   *   | identifier
-   * </pre>
-   *
-   * @param primaryAllowed `true` if the expression is allowed to be a primary without any
-   *          assignable selector
-   * @return the assignable expression that was parsed
-   */
-  Expression parseAssignableExpression(bool primaryAllowed) {
-    if (matches(Keyword.SUPER)) {
-      return parseAssignableSelector(new SuperExpression.full(andAdvance), false);
-    }
-    Expression expression = parsePrimaryExpression();
-    bool isOptional = primaryAllowed || expression is SimpleIdentifier;
-    while (true) {
-      while (matches5(TokenType.OPEN_PAREN)) {
-        ArgumentList argumentList = parseArgumentList();
-        if (expression is SimpleIdentifier) {
-          expression = new MethodInvocation.full(null, null, expression as SimpleIdentifier, argumentList);
-        } else if (expression is PrefixedIdentifier) {
-          PrefixedIdentifier identifier = expression as PrefixedIdentifier;
-          expression = new MethodInvocation.full(identifier.prefix, identifier.period, identifier.identifier, argumentList);
-        } else if (expression is PropertyAccess) {
-          PropertyAccess access = expression as PropertyAccess;
-          expression = new MethodInvocation.full(access.target, access.operator, access.propertyName, argumentList);
-        } else {
-          expression = new FunctionExpressionInvocation.full(expression, 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.full(identifier.prefix, identifier.period, identifier.identifier);
-        }
-        return expression;
-      }
-      expression = selectorExpression;
-      isOptional = true;
-    }
-  }
-
-  /**
-   * Parse an assignable selector.
-   *
-   * <pre>
-   * assignableSelector ::=
-   *     '[' expression ']'
-   *   | '.' identifier
-   * </pre>
-   *
-   * @param prefix the expression preceding the selector
-   * @param optional `true` if the selector is optional
-   * @return the assignable selector that was parsed
-   */
-  Expression parseAssignableSelector(Expression prefix, bool optional) {
-    if (matches5(TokenType.OPEN_SQUARE_BRACKET)) {
-      Token leftBracket = andAdvance;
-      Expression index = parseExpression2();
-      Token rightBracket = expect2(TokenType.CLOSE_SQUARE_BRACKET);
-      return new IndexExpression.forTarget_full(prefix, leftBracket, index, rightBracket);
-    } else if (matches5(TokenType.PERIOD)) {
-      Token period = andAdvance;
-      return new PropertyAccess.full(prefix, period, parseSimpleIdentifier());
-    } else {
-      if (!optional) {
-        reportError8(ParserErrorCode.MISSING_ASSIGNABLE_SELECTOR, []);
-      }
-      return prefix;
-    }
-  }
-
-  /**
-   * Parse a bitwise and expression.
-   *
-   * <pre>
-   * bitwiseAndExpression ::=
-   *     shiftExpression ('&' shiftExpression)*
-   *   | 'super' ('&' shiftExpression)+
-   * </pre>
-   *
-   * @return the bitwise and expression that was parsed
-   */
-  Expression parseBitwiseAndExpression() {
-    Expression expression;
-    if (matches(Keyword.SUPER) && matches4(peek(), TokenType.AMPERSAND)) {
-      expression = new SuperExpression.full(andAdvance);
-    } else {
-      expression = parseShiftExpression();
-    }
-    while (matches5(TokenType.AMPERSAND)) {
-      Token operator = andAdvance;
-      expression = new BinaryExpression.full(expression, operator, parseShiftExpression());
-    }
-    return expression;
-  }
-
-  /**
-   * Parse a bitwise or expression.
-   *
-   * <pre>
-   * bitwiseOrExpression ::=
-   *     bitwiseXorExpression ('|' bitwiseXorExpression)*
-   *   | 'super' ('|' bitwiseXorExpression)+
-   * </pre>
-   *
-   * @return the bitwise or expression that was parsed
-   */
-  Expression parseBitwiseOrExpression() {
-    Expression expression;
-    if (matches(Keyword.SUPER) && matches4(peek(), TokenType.BAR)) {
-      expression = new SuperExpression.full(andAdvance);
-    } else {
-      expression = parseBitwiseXorExpression();
-    }
-    while (matches5(TokenType.BAR)) {
-      Token operator = andAdvance;
-      expression = new BinaryExpression.full(expression, operator, parseBitwiseXorExpression());
-    }
-    return expression;
-  }
-
-  /**
-   * Parse a bitwise exclusive-or expression.
-   *
-   * <pre>
-   * bitwiseXorExpression ::=
-   *     bitwiseAndExpression ('^' bitwiseAndExpression)*
-   *   | 'super' ('^' bitwiseAndExpression)+
-   * </pre>
-   *
-   * @return the bitwise exclusive-or expression that was parsed
-   */
-  Expression parseBitwiseXorExpression() {
-    Expression expression;
-    if (matches(Keyword.SUPER) && matches4(peek(), TokenType.CARET)) {
-      expression = new SuperExpression.full(andAdvance);
-    } else {
-      expression = parseBitwiseAndExpression();
-    }
-    while (matches5(TokenType.CARET)) {
-      Token operator = andAdvance;
-      expression = new BinaryExpression.full(expression, operator, parseBitwiseAndExpression());
-    }
-    return expression;
-  }
-
-  /**
-   * Parse a block.
-   *
-   * <pre>
-   * block ::=
-   *     '{' statements '}'
-   * </pre>
-   *
-   * @return the block that was parsed
-   */
-  Block parseBlock() {
-    Token leftBracket = expect2(TokenType.OPEN_CURLY_BRACKET);
-    List<Statement> statements = new List<Statement>();
-    Token statementStart = _currentToken;
-    while (!matches5(TokenType.EOF) && !matches5(TokenType.CLOSE_CURLY_BRACKET)) {
-      Statement statement = parseStatement2();
-      if (statement != null) {
-        statements.add(statement);
-      }
-      if (identical(_currentToken, statementStart)) {
-        reportError9(ParserErrorCode.UNEXPECTED_TOKEN, _currentToken, [_currentToken.lexeme]);
-        advance();
-      }
-      statementStart = _currentToken;
-    }
-    Token rightBracket = expect2(TokenType.CLOSE_CURLY_BRACKET);
-    return new Block.full(leftBracket, statements, rightBracket);
-  }
-
-  /**
-   * Parse a break statement.
-   *
-   * <pre>
-   * breakStatement ::=
-   *     'break' identifier? ';'
-   * </pre>
-   *
-   * @return the break statement that was parsed
-   */
-  Statement parseBreakStatement() {
-    Token breakKeyword = expect(Keyword.BREAK);
-    SimpleIdentifier label = null;
-    if (matchesIdentifier()) {
-      label = parseSimpleIdentifier();
-    }
-    if (!_inLoop && !_inSwitch && label == null) {
-      reportError9(ParserErrorCode.BREAK_OUTSIDE_OF_LOOP, breakKeyword, []);
-    }
-    Token semicolon = expect2(TokenType.SEMICOLON);
-    return new BreakStatement.full(breakKeyword, label, semicolon);
-  }
-
-  /**
-   * Parse a cascade section.
-   *
-   * <pre>
-   * cascadeSection ::=
-   *     '..' (cascadeSelector arguments*) (assignableSelector arguments*)* cascadeAssignment?
-   *
-   * cascadeSelector ::=
-   *     '[' expression ']'
-   *   | identifier
-   *
-   * cascadeAssignment ::=
-   *     assignmentOperator expressionWithoutCascade
-   * </pre>
-   *
-   * @return the expression representing the cascaded method invocation
-   */
-  Expression parseCascadeSection() {
-    Token period = expect2(TokenType.PERIOD_PERIOD);
-    Expression expression = null;
-    SimpleIdentifier functionName = null;
-    if (matchesIdentifier()) {
-      functionName = parseSimpleIdentifier();
-    } else if (identical(_currentToken.type, TokenType.OPEN_SQUARE_BRACKET)) {
-      Token leftBracket = andAdvance;
-      Expression index = parseExpression2();
-      Token rightBracket = expect2(TokenType.CLOSE_SQUARE_BRACKET);
-      expression = new IndexExpression.forCascade_full(period, leftBracket, index, rightBracket);
-      period = null;
-    } else {
-      reportError9(ParserErrorCode.MISSING_IDENTIFIER, _currentToken, [_currentToken.lexeme]);
-      functionName = createSyntheticIdentifier();
-    }
-    if (identical(_currentToken.type, TokenType.OPEN_PAREN)) {
-      while (identical(_currentToken.type, TokenType.OPEN_PAREN)) {
-        if (functionName != null) {
-          expression = new MethodInvocation.full(expression, period, functionName, parseArgumentList());
-          period = null;
-          functionName = null;
-        } else if (expression == null) {
-          expression = new MethodInvocation.full(expression, period, createSyntheticIdentifier(), parseArgumentList());
-        } else {
-          expression = new FunctionExpressionInvocation.full(expression, parseArgumentList());
-        }
-      }
-    } else if (functionName != null) {
-      expression = new PropertyAccess.full(expression, period, functionName);
-      period = null;
-    }
-    bool progress = true;
-    while (progress) {
-      progress = false;
-      Expression selector = parseAssignableSelector(expression, true);
-      if (selector != expression) {
-        expression = selector;
-        progress = true;
-        while (identical(_currentToken.type, TokenType.OPEN_PAREN)) {
-          expression = new FunctionExpressionInvocation.full(expression, parseArgumentList());
-        }
-      }
-    }
-    if (_currentToken.type.isAssignmentOperator) {
-      Token operator = andAdvance;
-      ensureAssignable(expression);
-      expression = new AssignmentExpression.full(expression, operator, parseExpressionWithoutCascade());
-    }
-    return expression;
-  }
-
-  /**
-   * Parse a class declaration.
-   *
-   * <pre>
-   * classDeclaration ::=
-   *     metadata 'abstract'? 'class' name typeParameterList? (extendsClause withClause?)? implementsClause? '{' classMembers '}' |
-   *     metadata 'abstract'? 'class' mixinApplicationClass
-   * </pre>
-   *
-   * @param commentAndMetadata the metadata to be associated with the member
-   * @param abstractKeyword the token for the keyword 'abstract', or `null` if the keyword was
-   *          not given
-   * @return the class declaration that was parsed
-   */
-  CompilationUnitMember parseClassDeclaration(CommentAndMetadata commentAndMetadata, Token abstractKeyword) {
-    Token keyword = expect(Keyword.CLASS);
-    if (matchesIdentifier()) {
-      Token next = peek();
-      if (matches4(next, TokenType.LT)) {
-        next = skipTypeParameterList(next);
-        if (next != null && matches4(next, TokenType.EQ)) {
-          return parseClassTypeAlias(commentAndMetadata, keyword);
-        }
-      } else if (matches4(next, TokenType.EQ)) {
-        return parseClassTypeAlias(commentAndMetadata, keyword);
-      }
-    }
-    SimpleIdentifier name = parseSimpleIdentifier();
-    String className = name.name;
-    TypeParameterList typeParameters = null;
-    if (matches5(TokenType.LT)) {
-      typeParameters = parseTypeParameterList();
-    }
-    ExtendsClause extendsClause = null;
-    WithClause withClause = null;
-    ImplementsClause implementsClause = null;
-    bool foundClause = true;
-    while (foundClause) {
-      if (matches(Keyword.EXTENDS)) {
-        if (extendsClause == null) {
-          extendsClause = parseExtendsClause();
-          if (withClause != null) {
-            reportError9(ParserErrorCode.WITH_BEFORE_EXTENDS, withClause.withKeyword, []);
-          } else if (implementsClause != null) {
-            reportError9(ParserErrorCode.IMPLEMENTS_BEFORE_EXTENDS, implementsClause.keyword, []);
-          }
-        } else {
-          reportError9(ParserErrorCode.MULTIPLE_EXTENDS_CLAUSES, extendsClause.keyword, []);
-          parseExtendsClause();
-        }
-      } else if (matches(Keyword.WITH)) {
-        if (withClause == null) {
-          withClause = parseWithClause();
-          if (implementsClause != null) {
-            reportError9(ParserErrorCode.IMPLEMENTS_BEFORE_WITH, implementsClause.keyword, []);
-          }
-        } else {
-          reportError9(ParserErrorCode.MULTIPLE_WITH_CLAUSES, withClause.withKeyword, []);
-          parseWithClause();
-        }
-      } else if (matches(Keyword.IMPLEMENTS)) {
-        if (implementsClause == null) {
-          implementsClause = parseImplementsClause();
-        } else {
-          reportError9(ParserErrorCode.MULTIPLE_IMPLEMENTS_CLAUSES, implementsClause.keyword, []);
-          parseImplementsClause();
-        }
-      } else {
-        foundClause = false;
-      }
-    }
-    if (withClause != null && extendsClause == null) {
-      reportError9(ParserErrorCode.WITH_WITHOUT_EXTENDS, withClause.withKeyword, []);
-    }
-    NativeClause nativeClause = null;
-    if (matches2(_NATIVE) && matches4(peek(), TokenType.STRING)) {
-      nativeClause = parseNativeClause();
-    }
-    Token leftBracket = null;
-    List<ClassMember> members = null;
-    Token rightBracket = null;
-    if (matches5(TokenType.OPEN_CURLY_BRACKET)) {
-      leftBracket = expect2(TokenType.OPEN_CURLY_BRACKET);
-      members = parseClassMembers(className, getEndToken(leftBracket));
-      rightBracket = expect2(TokenType.CLOSE_CURLY_BRACKET);
-    } else {
-      leftBracket = createSyntheticToken2(TokenType.OPEN_CURLY_BRACKET);
-      rightBracket = createSyntheticToken2(TokenType.CLOSE_CURLY_BRACKET);
-      reportError8(ParserErrorCode.MISSING_CLASS_BODY, []);
-    }
-    ClassDeclaration classDeclaration = new ClassDeclaration.full(commentAndMetadata.comment, commentAndMetadata.metadata, abstractKeyword, keyword, name, typeParameters, extendsClause, withClause, implementsClause, leftBracket, members, rightBracket);
-    classDeclaration.nativeClause = nativeClause;
-    return classDeclaration;
-  }
-
-  /**
-   * Parse a class member.
-   *
-   * <pre>
-   * classMemberDefinition ::=
-   *     declaration ';'
-   *   | methodSignature functionBody
-   * </pre>
-   *
-   * @param className 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
-   */
-  ClassMember parseClassMember(String className) {
-    CommentAndMetadata commentAndMetadata = parseCommentAndMetadata();
-    Modifiers modifiers = parseModifiers();
-    if (matches(Keyword.VOID)) {
-      TypeName returnType = parseReturnType();
-      if (matches(Keyword.GET) && matchesIdentifier2(peek())) {
-        validateModifiersForGetterOrSetterOrMethod(modifiers);
-        return parseGetter(commentAndMetadata, modifiers.externalKeyword, modifiers.staticKeyword, returnType);
-      } else if (matches(Keyword.SET) && matchesIdentifier2(peek())) {
-        validateModifiersForGetterOrSetterOrMethod(modifiers);
-        return parseSetter(commentAndMetadata, modifiers.externalKeyword, modifiers.staticKeyword, returnType);
-      } else if (matches(Keyword.OPERATOR) && isOperator(peek())) {
-        validateModifiersForOperator(modifiers);
-        return parseOperator(commentAndMetadata, modifiers.externalKeyword, returnType);
-      } else if (matchesIdentifier() && matchesAny(peek(), [
-          TokenType.OPEN_PAREN,
-          TokenType.OPEN_CURLY_BRACKET,
-          TokenType.FUNCTION])) {
-        validateModifiersForGetterOrSetterOrMethod(modifiers);
-        return parseMethodDeclaration(commentAndMetadata, modifiers.externalKeyword, modifiers.staticKeyword, returnType);
-      } else {
-        if (matchesIdentifier()) {
-          if (matchesAny(peek(), [TokenType.EQ, TokenType.COMMA, TokenType.SEMICOLON])) {
-            reportError(ParserErrorCode.VOID_VARIABLE, returnType, []);
-            return parseInitializedIdentifierList(commentAndMetadata, modifiers.staticKeyword, validateModifiersForField(modifiers), returnType);
-          }
-        }
-        if (isOperator(_currentToken)) {
-          validateModifiersForOperator(modifiers);
-          return parseOperator(commentAndMetadata, modifiers.externalKeyword, returnType);
-        }
-        reportError9(ParserErrorCode.EXPECTED_EXECUTABLE, _currentToken, []);
-        return null;
-      }
-    } else if (matches(Keyword.GET) && matchesIdentifier2(peek())) {
-      validateModifiersForGetterOrSetterOrMethod(modifiers);
-      return parseGetter(commentAndMetadata, modifiers.externalKeyword, modifiers.staticKeyword, null);
-    } else if (matches(Keyword.SET) && matchesIdentifier2(peek())) {
-      validateModifiersForGetterOrSetterOrMethod(modifiers);
-      return parseSetter(commentAndMetadata, modifiers.externalKeyword, modifiers.staticKeyword, null);
-    } else if (matches(Keyword.OPERATOR) && isOperator(peek())) {
-      validateModifiersForOperator(modifiers);
-      return parseOperator(commentAndMetadata, modifiers.externalKeyword, null);
-    } else if (!matchesIdentifier()) {
-      if (isOperator(_currentToken)) {
-        validateModifiersForOperator(modifiers);
-        return parseOperator(commentAndMetadata, modifiers.externalKeyword, null);
-      }
-      reportError9(ParserErrorCode.EXPECTED_CLASS_MEMBER, _currentToken, []);
-      return null;
-    } else if (matches4(peek(), TokenType.PERIOD) && matchesIdentifier2(peek2(2)) && matches4(peek2(3), TokenType.OPEN_PAREN)) {
-      return parseConstructor(commentAndMetadata, modifiers.externalKeyword, validateModifiersForConstructor(modifiers), modifiers.factoryKeyword, parseSimpleIdentifier(), andAdvance, parseSimpleIdentifier(), parseFormalParameterList());
-    } else if (matches4(peek(), TokenType.OPEN_PAREN)) {
-      SimpleIdentifier methodName = parseSimpleIdentifier();
-      FormalParameterList parameters = parseFormalParameterList();
-      if (matches5(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 parseMethodDeclaration2(commentAndMetadata, modifiers.externalKeyword, modifiers.staticKeyword, null, methodName, parameters);
-    } else if (matchesAny(peek(), [TokenType.EQ, TokenType.COMMA, TokenType.SEMICOLON])) {
-      if (modifiers.constKeyword == null && modifiers.finalKeyword == null && modifiers.varKeyword == null) {
-        reportError8(ParserErrorCode.MISSING_CONST_FINAL_VAR_OR_TYPE, []);
-      }
-      return parseInitializedIdentifierList(commentAndMetadata, modifiers.staticKeyword, validateModifiersForField(modifiers), null);
-    }
-    TypeName type = parseTypeName();
-    if (matches(Keyword.GET) && matchesIdentifier2(peek())) {
-      validateModifiersForGetterOrSetterOrMethod(modifiers);
-      return parseGetter(commentAndMetadata, modifiers.externalKeyword, modifiers.staticKeyword, type);
-    } else if (matches(Keyword.SET) && matchesIdentifier2(peek())) {
-      validateModifiersForGetterOrSetterOrMethod(modifiers);
-      return parseSetter(commentAndMetadata, modifiers.externalKeyword, modifiers.staticKeyword, type);
-    } else if (matches(Keyword.OPERATOR) && isOperator(peek())) {
-      validateModifiersForOperator(modifiers);
-      return parseOperator(commentAndMetadata, modifiers.externalKeyword, type);
-    } else if (!matchesIdentifier()) {
-      if (matches5(TokenType.CLOSE_CURLY_BRACKET)) {
-        return parseInitializedIdentifierList(commentAndMetadata, modifiers.staticKeyword, validateModifiersForField(modifiers), type);
-      }
-      if (isOperator(_currentToken)) {
-        validateModifiersForOperator(modifiers);
-        return parseOperator(commentAndMetadata, modifiers.externalKeyword, type);
-      }
-      reportError9(ParserErrorCode.EXPECTED_CLASS_MEMBER, _currentToken, []);
-      return null;
-    } else if (matches4(peek(), TokenType.OPEN_PAREN)) {
-      SimpleIdentifier methodName = parseSimpleIdentifier();
-      FormalParameterList parameters = parseFormalParameterList();
-      if (methodName.name == className) {
-        reportError(ParserErrorCode.CONSTRUCTOR_WITH_RETURN_TYPE, type, []);
-        return parseConstructor(commentAndMetadata, modifiers.externalKeyword, validateModifiersForConstructor(modifiers), modifiers.factoryKeyword, methodName, null, null, parameters);
-      }
-      validateModifiersForGetterOrSetterOrMethod(modifiers);
-      validateFormalParameterList(parameters);
-      return parseMethodDeclaration2(commentAndMetadata, modifiers.externalKeyword, modifiers.staticKeyword, type, methodName, parameters);
-    }
-    return parseInitializedIdentifierList(commentAndMetadata, modifiers.staticKeyword, validateModifiersForField(modifiers), type);
-  }
-
-  /**
-   * Parse a list of class members.
-   *
-   * <pre>
-   * classMembers ::=
-   *     (metadata memberDefinition)*
-   * </pre>
-   *
-   * @param className the name of the class whose members are being parsed
-   * @param closingBracket the closing bracket for the class, or `null` if the closing bracket
-   *          is missing
-   * @return the list of class members that were parsed
-   */
-  List<ClassMember> parseClassMembers(String className, Token closingBracket) {
-    List<ClassMember> members = new List<ClassMember>();
-    Token memberStart = _currentToken;
-    while (!matches5(TokenType.EOF) && !matches5(TokenType.CLOSE_CURLY_BRACKET) && (closingBracket != null || (!matches(Keyword.CLASS) && !matches(Keyword.TYPEDEF)))) {
-      if (matches5(TokenType.SEMICOLON)) {
-        reportError9(ParserErrorCode.UNEXPECTED_TOKEN, _currentToken, [_currentToken.lexeme]);
-        advance();
-      } else {
-        ClassMember member = parseClassMember(className);
-        if (member != null) {
-          members.add(member);
-        }
-      }
-      if (identical(_currentToken, memberStart)) {
-        reportError9(ParserErrorCode.UNEXPECTED_TOKEN, _currentToken, [_currentToken.lexeme]);
-        advance();
-      }
-      memberStart = _currentToken;
-    }
-    return members;
-  }
-
-  /**
-   * Parse a class type alias.
-   *
-   * <pre>
-   * classTypeAlias ::=
-   *     identifier typeParameters? '=' 'abstract'? mixinApplication
-   *
-   * mixinApplication ::=
-   *     type withClause implementsClause? ';'
-   * </pre>
-   *
-   * @param commentAndMetadata the metadata to be associated with the member
-   * @param keyword the token representing the 'typedef' keyword
-   * @return the class type alias that was parsed
-   */
-  ClassTypeAlias parseClassTypeAlias(CommentAndMetadata commentAndMetadata, Token keyword) {
-    SimpleIdentifier className = parseSimpleIdentifier();
-    TypeParameterList typeParameters = null;
-    if (matches5(TokenType.LT)) {
-      typeParameters = parseTypeParameterList();
-    }
-    Token equals = expect2(TokenType.EQ);
-    Token abstractKeyword = null;
-    if (matches(Keyword.ABSTRACT)) {
-      abstractKeyword = andAdvance;
-    }
-    TypeName superclass = parseTypeName();
-    WithClause withClause = null;
-    if (matches(Keyword.WITH)) {
-      withClause = parseWithClause();
-    }
-    ImplementsClause implementsClause = null;
-    if (matches(Keyword.IMPLEMENTS)) {
-      implementsClause = parseImplementsClause();
-    }
-    Token semicolon;
-    if (matches5(TokenType.SEMICOLON)) {
-      semicolon = andAdvance;
-    } else {
-      if (matches5(TokenType.OPEN_CURLY_BRACKET)) {
-        reportError8(ParserErrorCode.EXPECTED_TOKEN, [TokenType.SEMICOLON.lexeme]);
-        Token leftBracket = andAdvance;
-        parseClassMembers(className.name, getEndToken(leftBracket));
-        expect2(TokenType.CLOSE_CURLY_BRACKET);
-      } else {
-        reportError9(ParserErrorCode.EXPECTED_TOKEN, _currentToken.previous, [TokenType.SEMICOLON.lexeme]);
-      }
-      semicolon = createSyntheticToken2(TokenType.SEMICOLON);
-    }
-    return new ClassTypeAlias.full(commentAndMetadata.comment, commentAndMetadata.metadata, keyword, className, typeParameters, equals, abstractKeyword, superclass, withClause, implementsClause, semicolon);
-  }
-
-  /**
-   * Parse a list of combinators in a directive.
-   *
-   * <pre>
-   * combinator ::=
-   *     'show' identifier (',' identifier)*
-   *   | 'hide' identifier (',' identifier)*
-   * </pre>
-   *
-   * @return the combinators that were parsed
-   */
-  List<Combinator> parseCombinators() {
-    List<Combinator> combinators = new List<Combinator>();
-    while (matches2(_SHOW) || matches2(_HIDE)) {
-      Token keyword = expect2(TokenType.IDENTIFIER);
-      if (keyword.lexeme == _SHOW) {
-        List<SimpleIdentifier> shownNames = parseIdentifierList();
-        combinators.add(new ShowCombinator.full(keyword, shownNames));
-      } else {
-        List<SimpleIdentifier> hiddenNames = parseIdentifierList();
-        combinators.add(new HideCombinator.full(keyword, hiddenNames));
-      }
-    }
-    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.
-   *
-   * <pre>
-   * metadata ::=
-   *     annotation*
-   * </pre>
-   *
-   * @return the documentation comment and metadata that were parsed
-   */
-  CommentAndMetadata parseCommentAndMetadata() {
-    Comment comment = parseDocumentationComment();
-    List<Annotation> metadata = new List<Annotation>();
-    while (matches5(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.
-   *
-   * <pre>
-   * commentReference ::=
-   *     'new'? prefixedIdentifier
-   * </pre>
-   *
-   * @param referenceSource the source occurring between the square brackets within a documentation
-   *          comment
-   * @param sourceOffset 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 parseCommentReference(String referenceSource, int sourceOffset) {
-    if (referenceSource.length == 0) {
-      return null;
-    }
-    try {
-      List<bool> errorFound = [false];
-      AnalysisErrorListener listener = new AnalysisErrorListener_15(errorFound);
-      Scanner scanner = new Scanner(null, new SubSequenceReader(new CharSequence(referenceSource), sourceOffset), listener);
-      scanner.setSourceStart(1, 1);
-      Token firstToken = scanner.tokenize();
-      if (errorFound[0]) {
-        return null;
-      }
-      Token newKeyword = null;
-      if (matches3(firstToken, Keyword.NEW)) {
-        newKeyword = firstToken;
-        firstToken = firstToken.next;
-      }
-      if (matchesIdentifier2(firstToken)) {
-        Token secondToken = firstToken.next;
-        Token thirdToken = secondToken.next;
-        Token nextToken;
-        Identifier identifier;
-        if (matches4(secondToken, TokenType.PERIOD) && matchesIdentifier2(thirdToken)) {
-          identifier = new PrefixedIdentifier.full(new SimpleIdentifier.full(firstToken), secondToken, new SimpleIdentifier.full(thirdToken));
-          nextToken = thirdToken.next;
-        } else {
-          identifier = new SimpleIdentifier.full(firstToken);
-          nextToken = firstToken.next;
-        }
-        if (nextToken.type != TokenType.EOF) {
-          return null;
-        }
-        return new CommentReference.full(newKeyword, identifier);
-      } else if (matches3(firstToken, Keyword.THIS) || matches3(firstToken, Keyword.NULL) || matches3(firstToken, Keyword.TRUE) || matches3(firstToken, Keyword.FALSE)) {
-        return null;
-      }
-    } on JavaException catch (exception) {
-    }
-    return null;
-  }
-
-  /**
-   * Parse all of the comment references occurring in the given array of documentation comments.
-   *
-   * <pre>
-   * commentReference ::=
-   *     '[' 'new'? qualified ']' libraryReference?
-   *
-   * libraryReference ::=
-   *      '(' stringLiteral ')'
-   * </pre>
-   *
-   * @param tokens the comment tokens representing the documentation comments to be parsed
-   * @return the comment references that were parsed
-   */
-  List<CommentReference> parseCommentReferences(List<Token> tokens) {
-    List<CommentReference> references = new List<CommentReference>();
-    for (Token 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 rightIndex = JavaString.indexOf(comment, ']', leftIndex);
-          if (rightIndex >= 0) {
-            int firstChar = comment.codeUnitAt(leftIndex + 1);
-            if (firstChar != 0x27 && firstChar != 0x22) {
-              if (isLinkText(comment, rightIndex)) {
-              } else {
-                CommentReference reference = parseCommentReference(comment.substring(leftIndex + 1, rightIndex), token.offset + leftIndex + 1);
-                if (reference != null) {
-                  references.add(reference);
-                }
-              }
-            }
-          } else {
-            rightIndex = leftIndex + 1;
-          }
-          leftIndex = JavaString.indexOf(comment, '[', rightIndex);
-        } else {
-          leftIndex = JavaString.indexOf(comment, '[', range[1] + 1);
-        }
-      }
-    }
-    return references;
-  }
-
-  /**
-   * Parse a compilation unit.
-   *
-   * Specified:
-   *
-   * <pre>
-   * compilationUnit ::=
-   *     scriptTag? directive* topLevelDeclaration*
-   * </pre>
-   * Actual:
-   *
-   * <pre>
-   * compilationUnit ::=
-   *     scriptTag? topLevelElement*
-   *
-   * topLevelElement ::=
-   *     directive
-   *   | topLevelDeclaration
-   * </pre>
-   *
-   * @return the compilation unit that was parsed
-   */
-  CompilationUnit parseCompilationUnit2() {
-    Token firstToken = _currentToken;
-    ScriptTag scriptTag = null;
-    if (matches5(TokenType.SCRIPT_TAG)) {
-      scriptTag = new ScriptTag.full(andAdvance);
-    }
-    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 (!matches5(TokenType.EOF)) {
-      CommentAndMetadata commentAndMetadata = parseCommentAndMetadata();
-      if ((matches(Keyword.IMPORT) || matches(Keyword.EXPORT) || matches(Keyword.LIBRARY) || matches(Keyword.PART)) && !matches4(peek(), TokenType.PERIOD) && !matches4(peek(), TokenType.LT)) {
-        Directive directive = parseDirective(commentAndMetadata);
-        if (declarations.length > 0 && !directiveFoundAfterDeclaration) {
-          reportError8(ParserErrorCode.DIRECTIVE_AFTER_DECLARATION, []);
-          directiveFoundAfterDeclaration = true;
-        }
-        if (directive is LibraryDirective) {
-          if (libraryDirectiveFound) {
-            reportError8(ParserErrorCode.MULTIPLE_LIBRARY_DIRECTIVES, []);
-          } else {
-            if (directives.length > 0) {
-              reportError8(ParserErrorCode.LIBRARY_DIRECTIVE_NOT_FIRST, []);
-            }
-            libraryDirectiveFound = true;
-          }
-        } else if (directive is PartDirective) {
-          partDirectiveFound = true;
-        } else if (partDirectiveFound) {
-          if (directive is ExportDirective) {
-            reportError9(ParserErrorCode.EXPORT_DIRECTIVE_AFTER_PART_DIRECTIVE, ((directive as NamespaceDirective)).keyword, []);
-          } else if (directive is ImportDirective) {
-            reportError9(ParserErrorCode.IMPORT_DIRECTIVE_AFTER_PART_DIRECTIVE, ((directive as NamespaceDirective)).keyword, []);
-          }
-        }
-        if (directive is PartOfDirective) {
-          if (partOfDirectiveFound) {
-            reportError8(ParserErrorCode.MULTIPLE_PART_OF_DIRECTIVES, []);
-          } else {
-            for (Directive precedingDirective in directives) {
-              reportError9(ParserErrorCode.NON_PART_OF_DIRECTIVE_IN_PART, precedingDirective.keyword, []);
-            }
-            partOfDirectiveFound = true;
-          }
-        } else {
-          if (partOfDirectiveFound) {
-            reportError9(ParserErrorCode.NON_PART_OF_DIRECTIVE_IN_PART, directive.keyword, []);
-          }
-        }
-        directives.add(directive);
-      } else if (matches5(TokenType.SEMICOLON)) {
-        reportError9(ParserErrorCode.UNEXPECTED_TOKEN, _currentToken, [_currentToken.lexeme]);
-        advance();
-      } else {
-        CompilationUnitMember member = parseCompilationUnitMember(commentAndMetadata);
-        if (member != null) {
-          declarations.add(member);
-        }
-      }
-      if (identical(_currentToken, memberStart)) {
-        reportError9(ParserErrorCode.UNEXPECTED_TOKEN, _currentToken, [_currentToken.lexeme]);
-        advance();
-        while (!matches5(TokenType.EOF) && !couldBeStartOfCompilationUnitMember()) {
-          advance();
-        }
-      }
-      memberStart = _currentToken;
-    }
-    return new CompilationUnit.full(firstToken, scriptTag, directives, declarations, _currentToken);
-  }
-
-  /**
-   * Parse a compilation unit member.
-   *
-   * <pre>
-   * compilationUnitMember ::=
-   *     classDefinition
-   *   | functionTypeAlias
-   *   | external functionSignature
-   *   | external getterSignature
-   *   | external setterSignature
-   *   | functionSignature functionBody
-   *   | returnType? getOrSet identifier formalParameterList functionBody
-   *   | (final | const) type? staticFinalDeclarationList ';'
-   *   | variableDeclaration ';'
-   * </pre>
-   *
-   * @param commentAndMetadata 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 parseCompilationUnitMember(CommentAndMetadata commentAndMetadata) {
-    Modifiers modifiers = parseModifiers();
-    if (matches(Keyword.CLASS)) {
-      return parseClassDeclaration(commentAndMetadata, validateModifiersForClass(modifiers));
-    } else if (matches(Keyword.TYPEDEF) && !matches4(peek(), TokenType.PERIOD) && !matches4(peek(), TokenType.LT)) {
-      validateModifiersForTypedef(modifiers);
-      return parseTypeAlias(commentAndMetadata);
-    }
-    if (matches(Keyword.VOID)) {
-      TypeName returnType = parseReturnType();
-      if ((matches(Keyword.GET) || matches(Keyword.SET)) && matchesIdentifier2(peek())) {
-        validateModifiersForTopLevelFunction(modifiers);
-        return parseFunctionDeclaration(commentAndMetadata, modifiers.externalKeyword, null);
-      } else if (matches(Keyword.OPERATOR) && isOperator(peek())) {
-        reportError9(ParserErrorCode.TOP_LEVEL_OPERATOR, _currentToken, []);
-        return convertToFunctionDeclaration(parseOperator(commentAndMetadata, modifiers.externalKeyword, returnType));
-      } else if (matchesIdentifier() && matchesAny(peek(), [
-          TokenType.OPEN_PAREN,
-          TokenType.OPEN_CURLY_BRACKET,
-          TokenType.FUNCTION])) {
-        validateModifiersForTopLevelFunction(modifiers);
-        return parseFunctionDeclaration(commentAndMetadata, modifiers.externalKeyword, returnType);
-      } else {
-        if (matchesIdentifier()) {
-          if (matchesAny(peek(), [TokenType.EQ, TokenType.COMMA, TokenType.SEMICOLON])) {
-            reportError(ParserErrorCode.VOID_VARIABLE, returnType, []);
-            return new TopLevelVariableDeclaration.full(commentAndMetadata.comment, commentAndMetadata.metadata, parseVariableDeclarationList2(null, validateModifiersForTopLevelVariable(modifiers), null), expect2(TokenType.SEMICOLON));
-          }
-        }
-        reportError9(ParserErrorCode.EXPECTED_EXECUTABLE, _currentToken, []);
-        return null;
-      }
-    } else if ((matches(Keyword.GET) || matches(Keyword.SET)) && matchesIdentifier2(peek())) {
-      validateModifiersForTopLevelFunction(modifiers);
-      return parseFunctionDeclaration(commentAndMetadata, modifiers.externalKeyword, null);
-    } else if (matches(Keyword.OPERATOR) && isOperator(peek())) {
-      reportError9(ParserErrorCode.TOP_LEVEL_OPERATOR, _currentToken, []);
-      return convertToFunctionDeclaration(parseOperator(commentAndMetadata, modifiers.externalKeyword, null));
-    } else if (!matchesIdentifier()) {
-      reportError9(ParserErrorCode.EXPECTED_EXECUTABLE, _currentToken, []);
-      return null;
-    } else if (matches4(peek(), TokenType.OPEN_PAREN)) {
-      validateModifiersForTopLevelFunction(modifiers);
-      return parseFunctionDeclaration(commentAndMetadata, modifiers.externalKeyword, null);
-    } else if (matchesAny(peek(), [TokenType.EQ, TokenType.COMMA, TokenType.SEMICOLON])) {
-      if (modifiers.constKeyword == null && modifiers.finalKeyword == null && modifiers.varKeyword == null) {
-        reportError8(ParserErrorCode.MISSING_CONST_FINAL_VAR_OR_TYPE, []);
-      }
-      return new TopLevelVariableDeclaration.full(commentAndMetadata.comment, commentAndMetadata.metadata, parseVariableDeclarationList2(null, validateModifiersForTopLevelVariable(modifiers), null), expect2(TokenType.SEMICOLON));
-    }
-    TypeName returnType = parseReturnType();
-    if ((matches(Keyword.GET) || matches(Keyword.SET)) && matchesIdentifier2(peek())) {
-      validateModifiersForTopLevelFunction(modifiers);
-      return parseFunctionDeclaration(commentAndMetadata, modifiers.externalKeyword, returnType);
-    } else if (matches(Keyword.OPERATOR) && isOperator(peek())) {
-      reportError9(ParserErrorCode.TOP_LEVEL_OPERATOR, _currentToken, []);
-      return convertToFunctionDeclaration(parseOperator(commentAndMetadata, modifiers.externalKeyword, returnType));
-    } else if (matches5(TokenType.AT)) {
-      return new TopLevelVariableDeclaration.full(commentAndMetadata.comment, commentAndMetadata.metadata, parseVariableDeclarationList2(null, validateModifiersForTopLevelVariable(modifiers), returnType), expect2(TokenType.SEMICOLON));
-    } else if (!matchesIdentifier()) {
-      reportError9(ParserErrorCode.EXPECTED_EXECUTABLE, _currentToken, []);
-      Token semicolon;
-      if (matches5(TokenType.SEMICOLON)) {
-        semicolon = andAdvance;
-      } else {
-        semicolon = createSyntheticToken2(TokenType.SEMICOLON);
-      }
-      List<VariableDeclaration> variables = new List<VariableDeclaration>();
-      variables.add(new VariableDeclaration.full(null, null, createSyntheticIdentifier(), null, null));
-      return new TopLevelVariableDeclaration.full(commentAndMetadata.comment, commentAndMetadata.metadata, new VariableDeclarationList.full(null, null, null, returnType, variables), semicolon);
-    }
-    if (matchesAny(peek(), [
-        TokenType.OPEN_PAREN,
-        TokenType.FUNCTION,
-        TokenType.OPEN_CURLY_BRACKET])) {
-      validateModifiersForTopLevelFunction(modifiers);
-      return parseFunctionDeclaration(commentAndMetadata, modifiers.externalKeyword, returnType);
-    }
-    return new TopLevelVariableDeclaration.full(commentAndMetadata.comment, commentAndMetadata.metadata, parseVariableDeclarationList2(null, validateModifiersForTopLevelVariable(modifiers), returnType), expect2(TokenType.SEMICOLON));
-  }
-
-  /**
-   * Parse a conditional expression.
-   *
-   * <pre>
-   * conditionalExpression ::=
-   *     logicalOrExpression ('?' expressionWithoutCascade ':' expressionWithoutCascade)?
-   * </pre>
-   *
-   * @return the conditional expression that was parsed
-   */
-  Expression parseConditionalExpression() {
-    Expression condition = parseLogicalOrExpression();
-    if (!matches5(TokenType.QUESTION)) {
-      return condition;
-    }
-    Token question = andAdvance;
-    Expression thenExpression = parseExpressionWithoutCascade();
-    Token colon = expect2(TokenType.COLON);
-    Expression elseExpression = parseExpressionWithoutCascade();
-    return new ConditionalExpression.full(condition, question, thenExpression, colon, elseExpression);
-  }
-
-  /**
-   * Parse a const expression.
-   *
-   * <pre>
-   * constExpression ::=
-   *     instanceCreationExpression
-   *   | listLiteral
-   *   | mapLiteral
-   * </pre>
-   *
-   * @return the const expression that was parsed
-   */
-  Expression parseConstExpression() {
-    Token keyword = expect(Keyword.CONST);
-    if (matches5(TokenType.OPEN_SQUARE_BRACKET) || matches5(TokenType.INDEX)) {
-      return parseListLiteral(keyword, null);
-    } else if (matches5(TokenType.OPEN_CURLY_BRACKET)) {
-      return parseMapLiteral(keyword, null);
-    } else if (matches5(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 (matches5(TokenType.COLON)) {
-      separator = andAdvance;
-      initializers = new List<ConstructorInitializer>();
-      do {
-        if (matches(Keyword.THIS)) {
-          if (matches4(peek(), TokenType.OPEN_PAREN)) {
-            bodyAllowed = false;
-            initializers.add(parseRedirectingConstructorInvocation());
-          } else if (matches4(peek(), TokenType.PERIOD) && matches4(peek2(3), TokenType.OPEN_PAREN)) {
-            bodyAllowed = false;
-            initializers.add(parseRedirectingConstructorInvocation());
-          } else {
-            initializers.add(parseConstructorFieldInitializer());
-          }
-        } else if (matches(Keyword.SUPER)) {
-          initializers.add(parseSuperConstructorInvocation());
-        } else {
-          initializers.add(parseConstructorFieldInitializer());
-        }
-      } while (optional(TokenType.COMMA));
-    }
-    ConstructorName redirectedConstructor = null;
-    FunctionBody body;
-    if (matches5(TokenType.EQ)) {
-      separator = andAdvance;
-      redirectedConstructor = parseConstructorName();
-      body = new EmptyFunctionBody.full(expect2(TokenType.SEMICOLON));
-      if (factoryKeyword == null) {
-        reportError(ParserErrorCode.REDIRECTION_IN_NON_FACTORY_CONSTRUCTOR, redirectedConstructor, []);
-      }
-    } else {
-      body = parseFunctionBody(true, ParserErrorCode.MISSING_FUNCTION_BODY, false);
-      if (constKeyword != null && factoryKeyword != null) {
-        reportError9(ParserErrorCode.CONST_FACTORY, factoryKeyword, []);
-      } else if (body is EmptyFunctionBody) {
-        if (factoryKeyword != null && externalKeyword == null) {
-          reportError9(ParserErrorCode.FACTORY_WITHOUT_BODY, factoryKeyword, []);
-        }
-      } else {
-        if (constKeyword != null) {
-          reportError(ParserErrorCode.CONST_CONSTRUCTOR_WITH_BODY, body, []);
-        } else if (!bodyAllowed) {
-          reportError(ParserErrorCode.EXTERNAL_CONSTRUCTOR_WITH_BODY, body, []);
-        }
-      }
-    }
-    return new ConstructorDeclaration.full(commentAndMetadata.comment, commentAndMetadata.metadata, externalKeyword, constKeyword, factoryKeyword, returnType, period, name, parameters, separator, initializers, redirectedConstructor, body);
-  }
-
-  /**
-   * Parse a field initializer within a constructor.
-   *
-   * <pre>
-   * fieldInitializer:
-   *     ('this' '.')? identifier '=' conditionalExpression cascadeSection*
-   * </pre>
-   *
-   * @return the field initializer that was parsed
-   */
-  ConstructorFieldInitializer parseConstructorFieldInitializer() {
-    Token keyword = null;
-    Token period = null;
-    if (matches(Keyword.THIS)) {
-      keyword = andAdvance;
-      period = expect2(TokenType.PERIOD);
-    }
-    SimpleIdentifier fieldName = parseSimpleIdentifier();
-    Token equals = expect2(TokenType.EQ);
-    Expression expression = parseConditionalExpression();
-    TokenType tokenType = _currentToken.type;
-    if (identical(tokenType, TokenType.PERIOD_PERIOD)) {
-      List<Expression> cascadeSections = new List<Expression>();
-      while (identical(tokenType, TokenType.PERIOD_PERIOD)) {
-        Expression section = parseCascadeSection();
-        if (section != null) {
-          cascadeSections.add(section);
-        }
-        tokenType = _currentToken.type;
-      }
-      expression = new CascadeExpression.full(expression, cascadeSections);
-    }
-    return new ConstructorFieldInitializer.full(keyword, period, fieldName, equals, expression);
-  }
-
-  /**
-   * Parse the name of a constructor.
-   *
-   * <pre>
-   * constructorName:
-   *     type ('.' identifier)?
-   * </pre>
-   *
-   * @return the constructor name that was parsed
-   */
-  ConstructorName parseConstructorName() {
-    TypeName type = parseTypeName();
-    Token period = null;
-    SimpleIdentifier name = null;
-    if (matches5(TokenType.PERIOD)) {
-      period = andAdvance;
-      name = parseSimpleIdentifier();
-    }
-    return new ConstructorName.full(type, period, name);
-  }
-
-  /**
-   * Parse a continue statement.
-   *
-   * <pre>
-   * continueStatement ::=
-   *     'continue' identifier? ';'
-   * </pre>
-   *
-   * @return the continue statement that was parsed
-   */
-  Statement parseContinueStatement() {
-    Token continueKeyword = expect(Keyword.CONTINUE);
-    if (!_inLoop && !_inSwitch) {
-      reportError9(ParserErrorCode.CONTINUE_OUTSIDE_OF_LOOP, continueKeyword, []);
-    }
-    SimpleIdentifier label = null;
-    if (matchesIdentifier()) {
-      label = parseSimpleIdentifier();
-    }
-    if (_inSwitch && !_inLoop && label == null) {
-      reportError9(ParserErrorCode.CONTINUE_WITHOUT_LABEL_IN_CASE, continueKeyword, []);
-    }
-    Token semicolon = expect2(TokenType.SEMICOLON);
-    return new ContinueStatement.full(continueKeyword, label, semicolon);
-  }
-
-  /**
-   * Parse a directive.
-   *
-   * <pre>
-   * directive ::=
-   *     exportDirective
-   *   | libraryDirective
-   *   | importDirective
-   *   | partDirective
-   * </pre>
-   *
-   * @param commentAndMetadata the metadata to be associated with the directive
-   * @return the directive that was parsed
-   */
-  Directive parseDirective(CommentAndMetadata commentAndMetadata) {
-    if (matches(Keyword.IMPORT)) {
-      return parseImportDirective(commentAndMetadata);
-    } else if (matches(Keyword.EXPORT)) {
-      return parseExportDirective(commentAndMetadata);
-    } else if (matches(Keyword.LIBRARY)) {
-      return parseLibraryDirective(commentAndMetadata);
-    } else if (matches(Keyword.PART)) {
-      return parsePartDirective(commentAndMetadata);
-    } else {
-      throw new IllegalStateException("parseDirective invoked in an invalid state; currentToken = ${_currentToken}");
-    }
-  }
-
-  /**
-   * Parse a documentation comment.
-   *
-   * <pre>
-   * documentationComment ::=
-   *     multiLineComment?
-   *   | singleLineComment*
-   * </pre>
-   *
-   * @return the documentation comment that was parsed, or `null` if there was no comment
-   */
-  Comment parseDocumentationComment() {
-    List<Token> commentTokens = new List<Token>();
-    Token commentToken = _currentToken.precedingComments;
-    while (commentToken != null) {
-      if (identical(commentToken.type, TokenType.SINGLE_LINE_COMMENT)) {
-        if (commentToken.lexeme.startsWith("///")) {
-          if (commentTokens.length == 1 && commentTokens[0].lexeme.startsWith("/**")) {
-            commentTokens.clear();
-          }
-          commentTokens.add(commentToken);
-        }
-      } else {
-        if (commentToken.lexeme.startsWith("/**")) {
-          commentTokens.clear();
-          commentTokens.add(commentToken);
-        }
-      }
-      commentToken = commentToken.next;
-    }
-    if (commentTokens.isEmpty) {
-      return null;
-    }
-    List<Token> tokens = new List.from(commentTokens);
-    List<CommentReference> references = parseCommentReferences(tokens);
-    return Comment.createDocumentationComment2(tokens, references);
-  }
-
-  /**
-   * Parse a do statement.
-   *
-   * <pre>
-   * doStatement ::=
-   *     'do' statement 'while' '(' expression ')' ';'
-   * </pre>
-   *
-   * @return the do statement that was parsed
-   */
-  Statement parseDoStatement() {
-    bool wasInLoop = _inLoop;
-    _inLoop = true;
-    try {
-      Token doKeyword = expect(Keyword.DO);
-      Statement body = parseStatement2();
-      Token whileKeyword = expect(Keyword.WHILE);
-      Token leftParenthesis = expect2(TokenType.OPEN_PAREN);
-      Expression condition = parseExpression2();
-      Token rightParenthesis = expect2(TokenType.CLOSE_PAREN);
-      Token semicolon = expect2(TokenType.SEMICOLON);
-      return new DoStatement.full(doKeyword, body, whileKeyword, leftParenthesis, condition, rightParenthesis, semicolon);
-    } finally {
-      _inLoop = wasInLoop;
-    }
-  }
-
-  /**
-   * Parse an empty statement.
-   *
-   * <pre>
-   * emptyStatement ::=
-   *     ';'
-   * </pre>
-   *
-   * @return the empty statement that was parsed
-   */
-  Statement parseEmptyStatement() => new EmptyStatement.full(andAdvance);
-
-  /**
-   * Parse an equality expression.
-   *
-   * <pre>
-   * equalityExpression ::=
-   *     relationalExpression (equalityOperator relationalExpression)?
-   *   | 'super' equalityOperator relationalExpression
-   * </pre>
-   *
-   * @return the equality expression that was parsed
-   */
-  Expression parseEqualityExpression() {
-    Expression expression;
-    if (matches(Keyword.SUPER) && _currentToken.next.type.isEqualityOperator) {
-      expression = new SuperExpression.full(andAdvance);
-    } else {
-      expression = parseRelationalExpression();
-    }
-    bool leftEqualityExpression = false;
-    while (_currentToken.type.isEqualityOperator) {
-      Token operator = andAdvance;
-      if (leftEqualityExpression) {
-        reportError(ParserErrorCode.EQUALITY_CANNOT_BE_EQUALITY_OPERAND, expression, []);
-      }
-      expression = new BinaryExpression.full(expression, operator, parseRelationalExpression());
-      leftEqualityExpression = true;
-    }
-    return expression;
-  }
-
-  /**
-   * Parse an export directive.
-   *
-   * <pre>
-   * exportDirective ::=
-   *     metadata 'export' stringLiteral combinator*';'
-   * </pre>
-   *
-   * @param commentAndMetadata the metadata to be associated with the directive
-   * @return the export directive that was parsed
-   */
-  ExportDirective parseExportDirective(CommentAndMetadata commentAndMetadata) {
-    Token exportKeyword = expect(Keyword.EXPORT);
-    StringLiteral libraryUri = parseStringLiteral();
-    List<Combinator> combinators = parseCombinators();
-    Token semicolon = expect2(TokenType.SEMICOLON);
-    return new ExportDirective.full(commentAndMetadata.comment, commentAndMetadata.metadata, exportKeyword, libraryUri, combinators, semicolon);
-  }
-
-  /**
-   * Parse an expression that does not contain any cascades.
-   *
-   * <pre>
-   * expression ::=
-   *     assignableExpression assignmentOperator expression
-   *   | conditionalExpression cascadeSection*
-   *   | throwExpression
-   * </pre>
-   *
-   * @return the expression that was parsed
-   */
-  Expression parseExpression2() {
-    if (matches(Keyword.THROW)) {
-      return parseThrowExpression();
-    } else if (matches(Keyword.RETHROW)) {
-      return parseRethrowExpression();
-    }
-    Expression expression = parseConditionalExpression();
-    TokenType tokenType = _currentToken.type;
-    if (identical(tokenType, TokenType.PERIOD_PERIOD)) {
-      List<Expression> cascadeSections = new List<Expression>();
-      while (identical(tokenType, TokenType.PERIOD_PERIOD)) {
-        Expression section = parseCascadeSection();
-        if (section != null) {
-          cascadeSections.add(section);
-        }
-        tokenType = _currentToken.type;
-      }
-      return new CascadeExpression.full(expression, cascadeSections);
-    } else if (tokenType.isAssignmentOperator) {
-      Token operator = andAdvance;
-      ensureAssignable(expression);
-      return new AssignmentExpression.full(expression, operator, parseExpression2());
-    }
-    return expression;
-  }
-
-  /**
-   * Parse a list of expressions.
-   *
-   * <pre>
-   * expressionList ::=
-   *     expression (',' expression)*
-   * </pre>
-   *
-   * @return the expression that was parsed
-   */
-  List<Expression> parseExpressionList() {
-    List<Expression> expressions = new List<Expression>();
-    expressions.add(parseExpression2());
-    while (optional(TokenType.COMMA)) {
-      expressions.add(parseExpression2());
-    }
-    return expressions;
-  }
-
-  /**
-   * Parse an expression that does not contain any cascades.
-   *
-   * <pre>
-   * expressionWithoutCascade ::=
-   *     assignableExpression assignmentOperator expressionWithoutCascade
-   *   | conditionalExpression
-   *   | throwExpressionWithoutCascade
-   * </pre>
-   *
-   * @return the expression that was parsed
-   */
-  Expression parseExpressionWithoutCascade() {
-    if (matches(Keyword.THROW)) {
-      return parseThrowExpressionWithoutCascade();
-    } else if (matches(Keyword.RETHROW)) {
-      return parseRethrowExpression();
-    }
-    Expression expression = parseConditionalExpression();
-    if (_currentToken.type.isAssignmentOperator) {
-      Token operator = andAdvance;
-      ensureAssignable(expression);
-      expression = new AssignmentExpression.full(expression, operator, parseExpressionWithoutCascade());
-    }
-    return expression;
-  }
-
-  /**
-   * Parse a class extends clause.
-   *
-   * <pre>
-   * classExtendsClause ::=
-   *     'extends' type
-   * </pre>
-   *
-   * @return the class extends clause that was parsed
-   */
-  ExtendsClause parseExtendsClause() {
-    Token keyword = expect(Keyword.EXTENDS);
-    TypeName superclass = parseTypeName();
-    return new ExtendsClause.full(keyword, superclass);
-  }
-
-  /**
-   * Parse the 'final', 'const', 'var' or type preceding a variable declaration.
-   *
-   * <pre>
-   * finalConstVarOrType ::=
-   *   | 'final' type?
-   *   | 'const' type?
-   *   | 'var'
-   *   | type
-   * </pre>
-   *
-   * @param optional `true` if the keyword and type are optional
-   * @return the 'final', 'const', 'var' or type that was parsed
-   */
-  FinalConstVarOrType parseFinalConstVarOrType(bool optional) {
-    Token keyword = null;
-    TypeName type = null;
-    if (matches(Keyword.FINAL) || matches(Keyword.CONST)) {
-      keyword = andAdvance;
-      if (isTypedIdentifier(_currentToken)) {
-        type = parseTypeName();
-      }
-    } else if (matches(Keyword.VAR)) {
-      keyword = andAdvance;
-    } else {
-      if (isTypedIdentifier(_currentToken)) {
-        type = parseReturnType();
-      } else if (!optional) {
-        reportError8(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`.
-   *
-   * <pre>
-   * defaultFormalParameter ::=
-   *     normalFormalParameter ('=' expression)?
-   *
-   * defaultNamedParameter ::=
-   *     normalFormalParameter (':' expression)?
-   * </pre>
-   *
-   * @param kind the kind of parameter being expected based on the presence or absence of group
-   *          delimiters
-   * @return the formal parameter that was parsed
-   */
-  FormalParameter parseFormalParameter(ParameterKind kind) {
-    NormalFormalParameter parameter = parseNormalFormalParameter();
-    if (matches5(TokenType.EQ)) {
-      Token seperator = andAdvance;
-      Expression defaultValue = parseExpression2();
-      if (identical(kind, ParameterKind.NAMED)) {
-        reportError9(ParserErrorCode.WRONG_SEPARATOR_FOR_NAMED_PARAMETER, seperator, []);
-      } else if (identical(kind, ParameterKind.REQUIRED)) {
-        reportError(ParserErrorCode.POSITIONAL_PARAMETER_OUTSIDE_GROUP, parameter, []);
-      }
-      return new DefaultFormalParameter.full(parameter, kind, seperator, defaultValue);
-    } else if (matches5(TokenType.COLON)) {
-      Token seperator = andAdvance;
-      Expression defaultValue = parseExpression2();
-      if (identical(kind, ParameterKind.POSITIONAL)) {
-        reportError9(ParserErrorCode.WRONG_SEPARATOR_FOR_POSITIONAL_PARAMETER, seperator, []);
-      } else if (identical(kind, ParameterKind.REQUIRED)) {
-        reportError(ParserErrorCode.NAMED_PARAMETER_OUTSIDE_GROUP, parameter, []);
-      }
-      return new DefaultFormalParameter.full(parameter, kind, seperator, defaultValue);
-    } else if (kind != ParameterKind.REQUIRED) {
-      return new DefaultFormalParameter.full(parameter, kind, null, null);
-    }
-    return parameter;
-  }
-
-  /**
-   * Parse a list of formal parameters.
-   *
-   * <pre>
-   * formalParameterList ::=
-   *     '(' ')'
-   *   | '(' normalFormalParameters (',' optionalFormalParameters)? ')'
-   *   | '(' optionalFormalParameters ')'
-   *
-   * normalFormalParameters ::=
-   *     normalFormalParameter (',' normalFormalParameter)*
-   *
-   * optionalFormalParameters ::=
-   *     optionalPositionalFormalParameters
-   *   | namedFormalParameters
-   *
-   * optionalPositionalFormalParameters ::=
-   *     '[' defaultFormalParameter (',' defaultFormalParameter)* ']'
-   *
-   * namedFormalParameters ::=
-   *     '{' defaultNamedParameter (',' defaultNamedParameter)* '}'
-   * </pre>
-   *
-   * @return the formal parameters that were parsed
-   */
-  FormalParameterList parseFormalParameterList() {
-    Token leftParenthesis = expect2(TokenType.OPEN_PAREN);
-    if (matches5(TokenType.CLOSE_PAREN)) {
-      return new FormalParameterList.full(leftParenthesis, null, null, null, andAdvance);
-    }
-    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)) {
-        if (getEndToken(leftParenthesis) != null) {
-          reportError8(ParserErrorCode.EXPECTED_TOKEN, [TokenType.COMMA.lexeme]);
-        } else {
-          reportError9(ParserErrorCode.MISSING_CLOSING_PARENTHESIS, _currentToken.previous, []);
-          break;
-        }
-      }
-      initialToken = _currentToken;
-      if (matches5(TokenType.OPEN_SQUARE_BRACKET)) {
-        wasOptionalParameter = true;
-        if (leftSquareBracket != null && !reportedMuliplePositionalGroups) {
-          reportError8(ParserErrorCode.MULTIPLE_POSITIONAL_PARAMETER_GROUPS, []);
-          reportedMuliplePositionalGroups = true;
-        }
-        if (leftCurlyBracket != null && !reportedMixedGroups) {
-          reportError8(ParserErrorCode.MIXED_PARAMETER_GROUPS, []);
-          reportedMixedGroups = true;
-        }
-        leftSquareBracket = andAdvance;
-        currentParameters = positionalParameters;
-        kind = ParameterKind.POSITIONAL;
-      } else if (matches5(TokenType.OPEN_CURLY_BRACKET)) {
-        wasOptionalParameter = true;
-        if (leftCurlyBracket != null && !reportedMulipleNamedGroups) {
-          reportError8(ParserErrorCode.MULTIPLE_NAMED_PARAMETER_GROUPS, []);
-          reportedMulipleNamedGroups = true;
-        }
-        if (leftSquareBracket != null && !reportedMixedGroups) {
-          reportError8(ParserErrorCode.MIXED_PARAMETER_GROUPS, []);
-          reportedMixedGroups = true;
-        }
-        leftCurlyBracket = andAdvance;
-        currentParameters = namedParameters;
-        kind = ParameterKind.NAMED;
-      }
-      FormalParameter parameter = parseFormalParameter(kind);
-      parameters.add(parameter);
-      currentParameters.add(parameter);
-      if (identical(kind, ParameterKind.REQUIRED) && wasOptionalParameter) {
-        reportError(ParserErrorCode.NORMAL_BEFORE_OPTIONAL_PARAMETERS, parameter, []);
-      }
-      if (matches5(TokenType.CLOSE_SQUARE_BRACKET)) {
-        rightSquareBracket = andAdvance;
-        currentParameters = normalParameters;
-        if (leftSquareBracket == null) {
-          if (leftCurlyBracket != null) {
-            reportError8(ParserErrorCode.WRONG_TERMINATOR_FOR_PARAMETER_GROUP, ["}"]);
-            rightCurlyBracket = rightSquareBracket;
-            rightSquareBracket = null;
-          } else {
-            reportError8(ParserErrorCode.UNEXPECTED_TERMINATOR_FOR_PARAMETER_GROUP, ["["]);
-          }
-        }
-        kind = ParameterKind.REQUIRED;
-      } else if (matches5(TokenType.CLOSE_CURLY_BRACKET)) {
-        rightCurlyBracket = andAdvance;
-        currentParameters = normalParameters;
-        if (leftCurlyBracket == null) {
-          if (leftSquareBracket != null) {
-            reportError8(ParserErrorCode.WRONG_TERMINATOR_FOR_PARAMETER_GROUP, ["]"]);
-            rightSquareBracket = rightCurlyBracket;
-            rightCurlyBracket = null;
-          } else {
-            reportError8(ParserErrorCode.UNEXPECTED_TERMINATOR_FOR_PARAMETER_GROUP, ["{"]);
-          }
-        }
-        kind = ParameterKind.REQUIRED;
-      }
-    } while (!matches5(TokenType.CLOSE_PAREN) && initialToken != _currentToken);
-    Token rightParenthesis = expect2(TokenType.CLOSE_PAREN);
-    if (leftSquareBracket != null && rightSquareBracket == null) {
-      reportError8(ParserErrorCode.MISSING_TERMINATOR_FOR_PARAMETER_GROUP, ["]"]);
-    }
-    if (leftCurlyBracket != null && rightCurlyBracket == null) {
-      reportError8(ParserErrorCode.MISSING_TERMINATOR_FOR_PARAMETER_GROUP, ["}"]);
-    }
-    if (leftSquareBracket == null) {
-      leftSquareBracket = leftCurlyBracket;
-    }
-    if (rightSquareBracket == null) {
-      rightSquareBracket = rightCurlyBracket;
-    }
-    return new FormalParameterList.full(leftParenthesis, parameters, leftSquareBracket, rightSquareBracket, rightParenthesis);
-  }
-
-  /**
-   * Parse a for statement.
-   *
-   * <pre>
-   * forStatement ::=
-   *     'for' '(' forLoopParts ')' statement
-   *
-   * forLoopParts ::=
-   *     forInitializerStatement expression? ';' expressionList?
-   *   | declaredIdentifier 'in' expression
-   *   | identifier 'in' expression
-   *
-   * forInitializerStatement ::=
-   *     localVariableDeclaration ';'
-   *   | expression? ';'
-   * </pre>
-   *
-   * @return the for statement that was parsed
-   */
-  Statement parseForStatement() {
-    bool wasInLoop = _inLoop;
-    _inLoop = true;
-    try {
-      Token forKeyword = expect(Keyword.FOR);
-      Token leftParenthesis = expect2(TokenType.OPEN_PAREN);
-      VariableDeclarationList variableList = null;
-      Expression initialization = null;
-      if (!matches5(TokenType.SEMICOLON)) {
-        CommentAndMetadata commentAndMetadata = parseCommentAndMetadata();
-        if (matchesIdentifier() && matches3(peek(), Keyword.IN)) {
-          List<VariableDeclaration> variables = new List<VariableDeclaration>();
-          SimpleIdentifier variableName = parseSimpleIdentifier();
-          variables.add(new VariableDeclaration.full(null, null, variableName, null, null));
-          variableList = new VariableDeclarationList.full(commentAndMetadata.comment, commentAndMetadata.metadata, null, null, variables);
-        } else if (isInitializedVariableDeclaration()) {
-          variableList = parseVariableDeclarationList(commentAndMetadata);
-        } else {
-          initialization = parseExpression2();
-        }
-        if (matches(Keyword.IN)) {
-          DeclaredIdentifier loopVariable = null;
-          SimpleIdentifier identifier = null;
-          if (variableList == null) {
-            reportError8(ParserErrorCode.MISSING_VARIABLE_IN_FOR_EACH, []);
-          } else {
-            NodeList<VariableDeclaration> variables = variableList.variables;
-            if (variables.length > 1) {
-              reportError8(ParserErrorCode.MULTIPLE_VARIABLES_IN_FOR_EACH, [variables.length.toString()]);
-            }
-            VariableDeclaration variable = variables[0];
-            if (variable.initializer != null) {
-              reportError8(ParserErrorCode.INITIALIZED_VARIABLE_IN_FOR_EACH, []);
-            }
-            Token keyword = variableList.keyword;
-            TypeName type = variableList.type;
-            if (keyword != null || type != null) {
-              loopVariable = new DeclaredIdentifier.full(commentAndMetadata.comment, commentAndMetadata.metadata, keyword, type, variable.name);
-            } else {
-              if (!commentAndMetadata.metadata.isEmpty) {
-              }
-              identifier = variable.name;
-            }
-          }
-          Token inKeyword = expect(Keyword.IN);
-          Expression iterator = parseExpression2();
-          Token rightParenthesis = expect2(TokenType.CLOSE_PAREN);
-          Statement body = parseStatement2();
-          if (loopVariable == null) {
-            return new ForEachStatement.con2_full(forKeyword, leftParenthesis, identifier, inKeyword, iterator, rightParenthesis, body);
-          }
-          return new ForEachStatement.con1_full(forKeyword, leftParenthesis, loopVariable, inKeyword, iterator, rightParenthesis, body);
-        }
-      }
-      Token leftSeparator = expect2(TokenType.SEMICOLON);
-      Expression condition = null;
-      if (!matches5(TokenType.SEMICOLON)) {
-        condition = parseExpression2();
-      }
-      Token rightSeparator = expect2(TokenType.SEMICOLON);
-      List<Expression> updaters = null;
-      if (!matches5(TokenType.CLOSE_PAREN)) {
-        updaters = parseExpressionList();
-      }
-      Token rightParenthesis = expect2(TokenType.CLOSE_PAREN);
-      Statement body = parseStatement2();
-      return new ForStatement.full(forKeyword, leftParenthesis, variableList, initialization, leftSeparator, condition, rightSeparator, updaters, rightParenthesis, body);
-    } finally {
-      _inLoop = wasInLoop;
-    }
-  }
-
-  /**
-   * Parse a function body.
-   *
-   * <pre>
-   * functionBody ::=
-   *     '=>' expression ';'
-   *   | block
-   *
-   * functionExpressionBody ::=
-   *     '=>' expression
-   *   | block
-   * </pre>
-   *
-   * @param mayBeEmpty `true` if the function body is allowed to be empty
-   * @param emptyErrorCode the error code to report if function body expecte, but not found
-   * @param inExpression `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 parseFunctionBody(bool mayBeEmpty, ParserErrorCode emptyErrorCode, bool inExpression) {
-    bool wasInLoop = _inLoop;
-    bool wasInSwitch = _inSwitch;
-    _inLoop = false;
-    _inSwitch = false;
-    try {
-      if (matches5(TokenType.SEMICOLON)) {
-        if (!mayBeEmpty) {
-          reportError8(emptyErrorCode, []);
-        }
-        return new EmptyFunctionBody.full(andAdvance);
-      } else if (matches5(TokenType.FUNCTION)) {
-        Token functionDefinition = andAdvance;
-        Expression expression = parseExpression2();
-        Token semicolon = null;
-        if (!inExpression) {
-          semicolon = expect2(TokenType.SEMICOLON);
-        }
-        return new ExpressionFunctionBody.full(functionDefinition, expression, semicolon);
-      } else if (matches5(TokenType.OPEN_CURLY_BRACKET)) {
-        return new BlockFunctionBody.full(parseBlock());
-      } else if (matches2(_NATIVE)) {
-        Token nativeToken = andAdvance;
-        StringLiteral stringLiteral = null;
-        if (matches5(TokenType.STRING)) {
-          stringLiteral = parseStringLiteral();
-        }
-        return new NativeFunctionBody.full(nativeToken, stringLiteral, expect2(TokenType.SEMICOLON));
-      } else {
-        reportError8(emptyErrorCode, []);
-        return new EmptyFunctionBody.full(createSyntheticToken2(TokenType.SEMICOLON));
-      }
-    } finally {
-      _inLoop = wasInLoop;
-      _inSwitch = wasInSwitch;
-    }
-  }
-
-  /**
-   * Parse a function declaration.
-   *
-   * <pre>
-   * functionDeclaration ::=
-   *     functionSignature functionBody
-   *   | returnType? getOrSet identifier formalParameterList functionBody
-   * </pre>
-   *
-   * @param commentAndMetadata the documentation comment and metadata to be associated with the
-   *          declaration
-   * @param externalKeyword the 'external' keyword, or `null` if the function is not external
-   * @param returnType the return type, or `null` if there is no return type
-   * @param isStatement `true` if the function declaration is being parsed as a statement
-   * @return the function declaration that was parsed
-   */
-  FunctionDeclaration parseFunctionDeclaration(CommentAndMetadata commentAndMetadata, Token externalKeyword, TypeName returnType) {
-    Token keyword = null;
-    bool isGetter = false;
-    if (matches(Keyword.GET) && !matches4(peek(), TokenType.OPEN_PAREN)) {
-      keyword = andAdvance;
-      isGetter = true;
-    } else if (matches(Keyword.SET) && !matches4(peek(), TokenType.OPEN_PAREN)) {
-      keyword = andAdvance;
-    }
-    SimpleIdentifier name = parseSimpleIdentifier();
-    FormalParameterList parameters = null;
-    if (!isGetter) {
-      if (matches5(TokenType.OPEN_PAREN)) {
-        parameters = parseFormalParameterList();
-        validateFormalParameterList(parameters);
-      } else {
-        reportError8(ParserErrorCode.MISSING_FUNCTION_PARAMETERS, []);
-      }
-    } else if (matches5(TokenType.OPEN_PAREN)) {
-      reportError8(ParserErrorCode.GETTER_WITH_PARAMETERS, []);
-      parseFormalParameterList();
-    }
-    FunctionBody body;
-    if (externalKeyword == null) {
-      body = parseFunctionBody(false, ParserErrorCode.MISSING_FUNCTION_BODY, false);
-    } else {
-      body = new EmptyFunctionBody.full(expect2(TokenType.SEMICOLON));
-    }
-    return new FunctionDeclaration.full(commentAndMetadata.comment, commentAndMetadata.metadata, externalKeyword, returnType, keyword, name, new FunctionExpression.full(parameters, body));
-  }
-
-  /**
-   * Parse a function declaration statement.
-   *
-   * <pre>
-   * functionDeclarationStatement ::=
-   *     functionSignature functionBody
-   * </pre>
-   *
-   * @return the function declaration statement that was parsed
-   */
-  Statement parseFunctionDeclarationStatement() {
-    Modifiers modifiers = parseModifiers();
-    validateModifiersForFunctionDeclarationStatement(modifiers);
-    return parseFunctionDeclarationStatement2(parseCommentAndMetadata(), parseOptionalReturnType());
-  }
-
-  /**
-   * Parse a function declaration statement.
-   *
-   * <pre>
-   * functionDeclarationStatement ::=
-   *     functionSignature functionBody
-   * </pre>
-   *
-   * @param commentAndMetadata the documentation comment and metadata to be associated with the
-   *          declaration
-   * @param returnType the return type, or `null` if there is no return type
-   * @return the function declaration statement that was parsed
-   */
-  Statement parseFunctionDeclarationStatement2(CommentAndMetadata commentAndMetadata, TypeName returnType) {
-    FunctionDeclaration declaration = parseFunctionDeclaration(commentAndMetadata, null, returnType);
-    Token propertyKeyword = declaration.propertyKeyword;
-    if (propertyKeyword != null) {
-      if (identical(((propertyKeyword as KeywordToken)).keyword, Keyword.GET)) {
-        reportError9(ParserErrorCode.GETTER_IN_FUNCTION, propertyKeyword, []);
-      } else {
-        reportError9(ParserErrorCode.SETTER_IN_FUNCTION, propertyKeyword, []);
-      }
-    }
-    return new FunctionDeclarationStatement.full(declaration);
-  }
-
-  /**
-   * Parse a function expression.
-   *
-   * <pre>
-   * functionExpression ::=
-   *     formalParameterList functionExpressionBody
-   * </pre>
-   *
-   * @return the function expression that was parsed
-   */
-  FunctionExpression parseFunctionExpression() {
-    FormalParameterList parameters = parseFormalParameterList();
-    validateFormalParameterList(parameters);
-    FunctionBody body = parseFunctionBody(false, ParserErrorCode.MISSING_FUNCTION_BODY, true);
-    return new FunctionExpression.full(parameters, body);
-  }
-
-  /**
-   * Parse a function type alias.
-   *
-   * <pre>
-   * functionTypeAlias ::=
-   *     functionPrefix typeParameterList? formalParameterList ';'
-   *
-   * functionPrefix ::=
-   *     returnType? name
-   * </pre>
-   *
-   * @param commentAndMetadata the metadata to be associated with the member
-   * @param keyword the token representing the 'typedef' keyword
-   * @return the function type alias that was parsed
-   */
-  FunctionTypeAlias parseFunctionTypeAlias(CommentAndMetadata commentAndMetadata, Token keyword) {
-    TypeName returnType = null;
-    if (hasReturnTypeInTypeAlias()) {
-      returnType = parseReturnType();
-    }
-    SimpleIdentifier name = parseSimpleIdentifier();
-    TypeParameterList typeParameters = null;
-    if (matches5(TokenType.LT)) {
-      typeParameters = parseTypeParameterList();
-    }
-    if (matches5(TokenType.SEMICOLON) || matches5(TokenType.EOF)) {
-      reportError8(ParserErrorCode.MISSING_TYPEDEF_PARAMETERS, []);
-      FormalParameterList parameters = new FormalParameterList.full(createSyntheticToken2(TokenType.OPEN_PAREN), null, null, null, createSyntheticToken2(TokenType.CLOSE_PAREN));
-      Token semicolon = expect2(TokenType.SEMICOLON);
-      return new FunctionTypeAlias.full(commentAndMetadata.comment, commentAndMetadata.metadata, keyword, returnType, name, typeParameters, parameters, semicolon);
-    } else if (!matches5(TokenType.OPEN_PAREN)) {
-      reportError8(ParserErrorCode.MISSING_TYPEDEF_PARAMETERS, []);
-      return new FunctionTypeAlias.full(commentAndMetadata.comment, commentAndMetadata.metadata, keyword, returnType, name, typeParameters, new FormalParameterList.full(createSyntheticToken2(TokenType.OPEN_PAREN), null, null, null, createSyntheticToken2(TokenType.CLOSE_PAREN)), createSyntheticToken2(TokenType.SEMICOLON));
-    }
-    FormalParameterList parameters = parseFormalParameterList();
-    validateFormalParameterList(parameters);
-    Token semicolon = expect2(TokenType.SEMICOLON);
-    return new FunctionTypeAlias.full(commentAndMetadata.comment, commentAndMetadata.metadata, keyword, returnType, name, typeParameters, parameters, semicolon);
-  }
-
-  /**
-   * Parse a getter.
-   *
-   * <pre>
-   * getter ::=
-   *     getterSignature functionBody?
-   *
-   * getterSignature ::=
-   *     'external'? 'static'? returnType? 'get' identifier
-   * </pre>
-   *
-   * @param commentAndMetadata the documentation comment and metadata to be associated with the
-   *          declaration
-   * @param externalKeyword the 'external' token
-   * @param staticKeyword the static keyword, or `null` if the getter is not static
-   * @param the return type that has already been parsed, or `null` if there was no return
-   *          type
-   * @return the getter that was parsed
-   */
-  MethodDeclaration parseGetter(CommentAndMetadata commentAndMetadata, Token externalKeyword, Token staticKeyword, TypeName returnType) {
-    Token propertyKeyword = expect(Keyword.GET);
-    SimpleIdentifier name = parseSimpleIdentifier();
-    if (matches5(TokenType.OPEN_PAREN) && matches4(peek(), TokenType.CLOSE_PAREN)) {
-      reportError8(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) {
-      reportError8(ParserErrorCode.EXTERNAL_GETTER_WITH_BODY, []);
-    }
-    return new MethodDeclaration.full(commentAndMetadata.comment, commentAndMetadata.metadata, externalKeyword, staticKeyword, returnType, propertyKeyword, null, name, null, body);
-  }
-
-  /**
-   * Parse a list of identifiers.
-   *
-   * <pre>
-   * identifierList ::=
-   *     identifier (',' identifier)*
-   * </pre>
-   *
-   * @return the list of identifiers that were parsed
-   */
-  List<SimpleIdentifier> parseIdentifierList() {
-    List<SimpleIdentifier> identifiers = new List<SimpleIdentifier>();
-    identifiers.add(parseSimpleIdentifier());
-    while (matches5(TokenType.COMMA)) {
-      advance();
-      identifiers.add(parseSimpleIdentifier());
-    }
-    return identifiers;
-  }
-
-  /**
-   * Parse an if statement.
-   *
-   * <pre>
-   * ifStatement ::=
-   *     'if' '(' expression ')' statement ('else' statement)?
-   * </pre>
-   *
-   * @return the if statement that was parsed
-   */
-  Statement parseIfStatement() {
-    Token ifKeyword = expect(Keyword.IF);
-    Token leftParenthesis = expect2(TokenType.OPEN_PAREN);
-    Expression condition = parseExpression2();
-    Token rightParenthesis = expect2(TokenType.CLOSE_PAREN);
-    Statement thenStatement = parseStatement2();
-    Token elseKeyword = null;
-    Statement elseStatement = null;
-    if (matches(Keyword.ELSE)) {
-      elseKeyword = andAdvance;
-      elseStatement = parseStatement2();
-    }
-    return new IfStatement.full(ifKeyword, leftParenthesis, condition, rightParenthesis, thenStatement, elseKeyword, elseStatement);
-  }
-
-  /**
-   * Parse an implements clause.
-   *
-   * <pre>
-   * implementsClause ::=
-   *     'implements' type (',' type)*
-   * </pre>
-   *
-   * @return the implements clause that was parsed
-   */
-  ImplementsClause parseImplementsClause() {
-    Token keyword = expect(Keyword.IMPLEMENTS);
-    List<TypeName> interfaces = new List<TypeName>();
-    interfaces.add(parseTypeName());
-    while (optional(TokenType.COMMA)) {
-      interfaces.add(parseTypeName());
-    }
-    return new ImplementsClause.full(keyword, interfaces);
-  }
-
-  /**
-   * Parse an import directive.
-   *
-   * <pre>
-   * importDirective ::=
-   *     metadata 'import' stringLiteral ('as' identifier)? combinator*';'
-   * </pre>
-   *
-   * @param commentAndMetadata the metadata to be associated with the directive
-   * @return the import directive that was parsed
-   */
-  ImportDirective parseImportDirective(CommentAndMetadata commentAndMetadata) {
-    Token importKeyword = expect(Keyword.IMPORT);
-    StringLiteral libraryUri = parseStringLiteral();
-    Token asToken = null;
-    SimpleIdentifier prefix = null;
-    if (matches(Keyword.AS)) {
-      asToken = andAdvance;
-      prefix = parseSimpleIdentifier();
-    }
-    List<Combinator> combinators = parseCombinators();
-    Token semicolon = expect2(TokenType.SEMICOLON);
-    return new ImportDirective.full(commentAndMetadata.comment, commentAndMetadata.metadata, importKeyword, libraryUri, asToken, prefix, combinators, semicolon);
-  }
-
-  /**
-   * Parse a list of initialized identifiers.
-   *
-   * <pre>
-   * ?? ::=
-   *     'static'? ('var' | type) initializedIdentifierList ';'
-   *   | 'final' type? initializedIdentifierList ';'
-   *
-   * initializedIdentifierList ::=
-   *     initializedIdentifier (',' initializedIdentifier)*
-   *
-   * initializedIdentifier ::=
-   *     identifier ('=' expression)?
-   * </pre>
-   *
-   * @param commentAndMetadata the documentation comment and metadata to be associated with the
-   *          declaration
-   * @param staticKeyword the static keyword, or `null` if the getter is not static
-   * @param keyword the token representing the 'final', 'const' or 'var' keyword, or `null` if
-   *          there is no keyword
-   * @param type the type that has already been parsed, or `null` if 'var' was provided
-   * @return the getter that was parsed
-   */
-  FieldDeclaration parseInitializedIdentifierList(CommentAndMetadata commentAndMetadata, Token staticKeyword, Token keyword, TypeName type) {
-    VariableDeclarationList fieldList = parseVariableDeclarationList2(null, keyword, type);
-    return new FieldDeclaration.full(commentAndMetadata.comment, commentAndMetadata.metadata, staticKeyword, fieldList, expect2(TokenType.SEMICOLON));
-  }
-
-  /**
-   * Parse an instance creation expression.
-   *
-   * <pre>
-   * instanceCreationExpression ::=
-   *     ('new' | 'const') type ('.' identifier)? argumentList
-   * </pre>
-   *
-   * @param keyword the 'new' or 'const' keyword that introduces the expression
-   * @return the instance creation expression that was parsed
-   */
-  InstanceCreationExpression parseInstanceCreationExpression(Token keyword) {
-    ConstructorName constructorName = parseConstructorName();
-    ArgumentList argumentList = parseArgumentList();
-    return new InstanceCreationExpression.full(keyword, constructorName, argumentList);
-  }
-
-  /**
-   * Parse a library directive.
-   *
-   * <pre>
-   * libraryDirective ::=
-   *     metadata 'library' identifier ';'
-   * </pre>
-   *
-   * @param commentAndMetadata the metadata to be associated with the directive
-   * @return the library directive that was parsed
-   */
-  LibraryDirective parseLibraryDirective(CommentAndMetadata commentAndMetadata) {
-    Token keyword = expect(Keyword.LIBRARY);
-    LibraryIdentifier libraryName = parseLibraryName(ParserErrorCode.MISSING_NAME_IN_LIBRARY_DIRECTIVE, keyword);
-    Token semicolon = expect2(TokenType.SEMICOLON);
-    return new LibraryDirective.full(commentAndMetadata.comment, commentAndMetadata.metadata, keyword, libraryName, semicolon);
-  }
-
-  /**
-   * Parse a library identifier.
-   *
-   * <pre>
-   * libraryIdentifier ::=
-   *     identifier ('.' identifier)*
-   * </pre>
-   *
-   * @return the library identifier that was parsed
-   */
-  LibraryIdentifier parseLibraryIdentifier() {
-    List<SimpleIdentifier> components = new List<SimpleIdentifier>();
-    components.add(parseSimpleIdentifier());
-    while (matches5(TokenType.PERIOD)) {
-      advance();
-      components.add(parseSimpleIdentifier());
-    }
-    return new LibraryIdentifier.full(components);
-  }
-
-  /**
-   * Parse a library name.
-   *
-   * <pre>
-   * libraryName ::=
-   *     libraryIdentifier
-   * </pre>
-   *
-   * @param missingNameError the error code to be used if the library name is missing
-   * @param missingNameToken the token associated with the error produced if the library name is
-   *          missing
-   * @return the library name that was parsed
-   */
-  LibraryIdentifier parseLibraryName(ParserErrorCode missingNameError, Token missingNameToken) {
-    if (matchesIdentifier()) {
-      return parseLibraryIdentifier();
-    } else if (matches5(TokenType.STRING)) {
-      StringLiteral string = parseStringLiteral();
-      reportError(ParserErrorCode.NON_IDENTIFIER_LIBRARY_NAME, string, []);
-    } else {
-      reportError9(missingNameError, missingNameToken, []);
-    }
-    List<SimpleIdentifier> components = new List<SimpleIdentifier>();
-    components.add(createSyntheticIdentifier());
-    return new LibraryIdentifier.full(components);
-  }
-
-  /**
-   * Parse a list literal.
-   *
-   * <pre>
-   * listLiteral ::=
-   *     'const'? typeArguments? '[' (expressionList ','?)? ']'
-   * </pre>
-   *
-   * @param modifier the 'const' modifier appearing before the literal, or `null` if there is
-   *          no modifier
-   * @param typeArguments the type arguments appearing before the literal, or `null` if there
-   *          are no type arguments
-   * @return the list literal that was parsed
-   */
-  ListLiteral parseListLiteral(Token modifier, TypeArgumentList typeArguments) {
-    if (matches5(TokenType.INDEX)) {
-      BeginToken leftBracket = new BeginToken(TokenType.OPEN_SQUARE_BRACKET, _currentToken.offset);
-      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.full(modifier, typeArguments, leftBracket, null, rightBracket);
-    }
-    Token leftBracket = expect2(TokenType.OPEN_SQUARE_BRACKET);
-    if (matches5(TokenType.CLOSE_SQUARE_BRACKET)) {
-      return new ListLiteral.full(modifier, typeArguments, leftBracket, null, andAdvance);
-    }
-    List<Expression> elements = new List<Expression>();
-    elements.add(parseExpression2());
-    while (optional(TokenType.COMMA)) {
-      if (matches5(TokenType.CLOSE_SQUARE_BRACKET)) {
-        return new ListLiteral.full(modifier, typeArguments, leftBracket, elements, andAdvance);
-      }
-      elements.add(parseExpression2());
-    }
-    Token rightBracket = expect2(TokenType.CLOSE_SQUARE_BRACKET);
-    return new ListLiteral.full(modifier, typeArguments, leftBracket, elements, rightBracket);
-  }
-
-  /**
-   * Parse a list or map literal.
-   *
-   * <pre>
-   * listOrMapLiteral ::=
-   *     listLiteral
-   *   | mapLiteral
-   * </pre>
-   *
-   * @param modifier the 'const' modifier appearing before the literal, or `null` if there is
-   *          no modifier
-   * @return the list or map literal that was parsed
-   */
-  TypedLiteral parseListOrMapLiteral(Token modifier) {
-    TypeArgumentList typeArguments = null;
-    if (matches5(TokenType.LT)) {
-      typeArguments = parseTypeArgumentList();
-    }
-    if (matches5(TokenType.OPEN_CURLY_BRACKET)) {
-      return parseMapLiteral(modifier, typeArguments);
-    } else if (matches5(TokenType.OPEN_SQUARE_BRACKET) || matches5(TokenType.INDEX)) {
-      return parseListLiteral(modifier, typeArguments);
-    }
-    reportError8(ParserErrorCode.EXPECTED_LIST_OR_MAP_LITERAL, []);
-    return new ListLiteral.full(modifier, typeArguments, createSyntheticToken2(TokenType.OPEN_SQUARE_BRACKET), null, createSyntheticToken2(TokenType.CLOSE_SQUARE_BRACKET));
-  }
-
-  /**
-   * Parse a logical and expression.
-   *
-   * <pre>
-   * logicalAndExpression ::=
-   *     equalityExpression ('&&' equalityExpression)*
-   * </pre>
-   *
-   * @return the logical and expression that was parsed
-   */
-  Expression parseLogicalAndExpression() {
-    Expression expression = parseEqualityExpression();
-    while (matches5(TokenType.AMPERSAND_AMPERSAND)) {
-      Token operator = andAdvance;
-      expression = new BinaryExpression.full(expression, operator, parseEqualityExpression());
-    }
-    return expression;
-  }
-
-  /**
-   * Parse a logical or expression.
-   *
-   * <pre>
-   * logicalOrExpression ::=
-   *     logicalAndExpression ('||' logicalAndExpression)*
-   * </pre>
-   *
-   * @return the logical or expression that was parsed
-   */
-  Expression parseLogicalOrExpression() {
-    Expression expression = parseLogicalAndExpression();
-    while (matches5(TokenType.BAR_BAR)) {
-      Token operator = andAdvance;
-      expression = new BinaryExpression.full(expression, operator, parseLogicalAndExpression());
-    }
-    return expression;
-  }
-
-  /**
-   * Parse a map literal.
-   *
-   * <pre>
-   * mapLiteral ::=
-   *     'const'? typeArguments? '{' (mapLiteralEntry (',' mapLiteralEntry)* ','?)? '}'
-   * </pre>
-   *
-   * @param modifier the 'const' modifier appearing before the literal, or `null` if there is
-   *          no modifier
-   * @param typeArguments the type arguments that were declared, or `null` if there are no
-   *          type arguments
-   * @return the map literal that was parsed
-   */
-  MapLiteral parseMapLiteral(Token modifier, TypeArgumentList typeArguments) {
-    Token leftBracket = expect2(TokenType.OPEN_CURLY_BRACKET);
-    List<MapLiteralEntry> entries = new List<MapLiteralEntry>();
-    if (matches5(TokenType.CLOSE_CURLY_BRACKET)) {
-      return new MapLiteral.full(modifier, typeArguments, leftBracket, entries, andAdvance);
-    }
-    entries.add(parseMapLiteralEntry());
-    while (optional(TokenType.COMMA)) {
-      if (matches5(TokenType.CLOSE_CURLY_BRACKET)) {
-        return new MapLiteral.full(modifier, typeArguments, leftBracket, entries, andAdvance);
-      }
-      entries.add(parseMapLiteralEntry());
-    }
-    Token rightBracket = expect2(TokenType.CLOSE_CURLY_BRACKET);
-    return new MapLiteral.full(modifier, typeArguments, leftBracket, entries, rightBracket);
-  }
-
-  /**
-   * Parse a map literal entry.
-   *
-   * <pre>
-   * mapLiteralEntry ::=
-   *     expression ':' expression
-   * </pre>
-   *
-   * @return the map literal entry that was parsed
-   */
-  MapLiteralEntry parseMapLiteralEntry() {
-    Expression key = parseExpression2();
-    Token separator = expect2(TokenType.COLON);
-    Expression value = parseExpression2();
-    return new MapLiteralEntry.full(key, separator, value);
-  }
-
-  /**
-   * Parse a method declaration.
-   *
-   * <pre>
-   * functionDeclaration ::=
-   *     'external'? 'static'? functionSignature functionBody
-   *   | 'external'? functionSignature ';'
-   * </pre>
-   *
-   * @param commentAndMetadata the documentation comment and metadata to be associated with the
-   *          declaration
-   * @param externalKeyword the 'external' token
-   * @param staticKeyword the static keyword, or `null` if the getter is not static
-   * @param returnType the return type of the method
-   * @return the method declaration that was parsed
-   */
-  MethodDeclaration parseMethodDeclaration(CommentAndMetadata commentAndMetadata, Token externalKeyword, Token staticKeyword, TypeName returnType) {
-    SimpleIdentifier methodName = parseSimpleIdentifier();
-    FormalParameterList parameters = parseFormalParameterList();
-    validateFormalParameterList(parameters);
-    return parseMethodDeclaration2(commentAndMetadata, externalKeyword, staticKeyword, returnType, methodName, parameters);
-  }
-
-  /**
-   * Parse a method declaration.
-   *
-   * <pre>
-   * functionDeclaration ::=
-   *     ('external' 'static'?)? functionSignature functionBody
-   *   | 'external'? functionSignature ';'
-   * </pre>
-   *
-   * @param commentAndMetadata the documentation comment and metadata to be associated with the
-   *          declaration
-   * @param externalKeyword the 'external' token
-   * @param staticKeyword the static keyword, or `null` if the getter is not static
-   * @param returnType the return type of the method
-   * @param name the name of the method
-   * @param parameters the parameters to the method
-   * @return the method declaration that was parsed
-   */
-  MethodDeclaration parseMethodDeclaration2(CommentAndMetadata commentAndMetadata, Token externalKeyword, Token staticKeyword, TypeName returnType, SimpleIdentifier name, FormalParameterList parameters) {
-    FunctionBody body = parseFunctionBody(externalKeyword != null || staticKeyword == null, ParserErrorCode.MISSING_FUNCTION_BODY, false);
-    if (externalKeyword != null) {
-      if (body is! EmptyFunctionBody) {
-        reportError(ParserErrorCode.EXTERNAL_METHOD_WITH_BODY, body, []);
-      }
-    } else if (staticKeyword != null) {
-      if (body is EmptyFunctionBody) {
-        reportError(ParserErrorCode.ABSTRACT_STATIC_METHOD, body, []);
-      }
-    }
-    return new MethodDeclaration.full(commentAndMetadata.comment, commentAndMetadata.metadata, externalKeyword, staticKeyword, returnType, null, null, name, parameters, body);
-  }
-
-  /**
-   * 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`.
-   *
-   * <pre>
-   * modifiers ::=
-   *     ('abstract' | 'const' | 'external' | 'factory' | 'final' | 'static' | 'var')*
-   * </pre>
-   *
-   * @return the modifiers that were parsed
-   */
-  Modifiers parseModifiers() {
-    Modifiers modifiers = new Modifiers();
-    bool progress = true;
-    while (progress) {
-      if (matches(Keyword.ABSTRACT) && !matches4(peek(), TokenType.PERIOD) && !matches4(peek(), TokenType.LT)) {
-        if (modifiers.abstractKeyword != null) {
-          reportError8(ParserErrorCode.DUPLICATED_MODIFIER, [_currentToken.lexeme]);
-          advance();
-        } else {
-          modifiers.abstractKeyword = andAdvance;
-        }
-      } else if (matches(Keyword.CONST)) {
-        if (modifiers.constKeyword != null) {
-          reportError8(ParserErrorCode.DUPLICATED_MODIFIER, [_currentToken.lexeme]);
-          advance();
-        } else {
-          modifiers.constKeyword = andAdvance;
-        }
-      } else if (matches(Keyword.EXTERNAL) && !matches4(peek(), TokenType.PERIOD) && !matches4(peek(), TokenType.LT)) {
-        if (modifiers.externalKeyword != null) {
-          reportError8(ParserErrorCode.DUPLICATED_MODIFIER, [_currentToken.lexeme]);
-          advance();
-        } else {
-          modifiers.externalKeyword = andAdvance;
-        }
-      } else if (matches(Keyword.FACTORY) && !matches4(peek(), TokenType.PERIOD) && !matches4(peek(), TokenType.LT)) {
-        if (modifiers.factoryKeyword != null) {
-          reportError8(ParserErrorCode.DUPLICATED_MODIFIER, [_currentToken.lexeme]);
-          advance();
-        } else {
-          modifiers.factoryKeyword = andAdvance;
-        }
-      } else if (matches(Keyword.FINAL)) {
-        if (modifiers.finalKeyword != null) {
-          reportError8(ParserErrorCode.DUPLICATED_MODIFIER, [_currentToken.lexeme]);
-          advance();
-        } else {
-          modifiers.finalKeyword = andAdvance;
-        }
-      } else if (matches(Keyword.STATIC) && !matches4(peek(), TokenType.PERIOD) && !matches4(peek(), TokenType.LT)) {
-        if (modifiers.staticKeyword != null) {
-          reportError8(ParserErrorCode.DUPLICATED_MODIFIER, [_currentToken.lexeme]);
-          advance();
-        } else {
-          modifiers.staticKeyword = andAdvance;
-        }
-      } else if (matches(Keyword.VAR)) {
-        if (modifiers.varKeyword != null) {
-          reportError8(ParserErrorCode.DUPLICATED_MODIFIER, [_currentToken.lexeme]);
-          advance();
-        } else {
-          modifiers.varKeyword = andAdvance;
-        }
-      } else {
-        progress = false;
-      }
-    }
-    return modifiers;
-  }
-
-  /**
-   * Parse a multiplicative expression.
-   *
-   * <pre>
-   * multiplicativeExpression ::=
-   *     unaryExpression (multiplicativeOperator unaryExpression)*
-   *   | 'super' (multiplicativeOperator unaryExpression)+
-   * </pre>
-   *
-   * @return the multiplicative expression that was parsed
-   */
-  Expression parseMultiplicativeExpression() {
-    Expression expression;
-    if (matches(Keyword.SUPER) && _currentToken.next.type.isMultiplicativeOperator) {
-      expression = new SuperExpression.full(andAdvance);
-    } else {
-      expression = parseUnaryExpression();
-    }
-    while (_currentToken.type.isMultiplicativeOperator) {
-      Token operator = andAdvance;
-      expression = new BinaryExpression.full(expression, operator, parseUnaryExpression());
-    }
-    return expression;
-  }
-
-  /**
-   * Parse a class native clause.
-   *
-   * <pre>
-   * classNativeClause ::=
-   *     'native' name
-   * </pre>
-   *
-   * @return the class native clause that was parsed
-   */
-  NativeClause parseNativeClause() {
-    Token keyword = andAdvance;
-    StringLiteral name = parseStringLiteral();
-    return new NativeClause.full(keyword, name);
-  }
-
-  /**
-   * Parse a new expression.
-   *
-   * <pre>
-   * newExpression ::=
-   *     instanceCreationExpression
-   * </pre>
-   *
-   * @return the new expression that was parsed
-   */
-  InstanceCreationExpression parseNewExpression() => parseInstanceCreationExpression(expect(Keyword.NEW));
-
-  /**
-   * Parse a non-labeled statement.
-   *
-   * <pre>
-   * nonLabeledStatement ::=
-   *     block
-   *   | assertStatement
-   *   | breakStatement
-   *   | continueStatement
-   *   | doStatement
-   *   | forStatement
-   *   | ifStatement
-   *   | returnStatement
-   *   | switchStatement
-   *   | tryStatement
-   *   | whileStatement
-   *   | variableDeclarationList ';'
-   *   | expressionStatement
-   *   | functionSignature functionBody
-   * </pre>
-   *
-   * @return the non-labeled statement that was parsed
-   */
-  Statement parseNonLabeledStatement() {
-    CommentAndMetadata commentAndMetadata = parseCommentAndMetadata();
-    if (matches5(TokenType.OPEN_CURLY_BRACKET)) {
-      if (matches4(peek(), TokenType.STRING)) {
-        Token afterString = skipStringLiteral(_currentToken.next);
-        if (afterString != null && identical(afterString.type, TokenType.COLON)) {
-          return new ExpressionStatement.full(parseExpression2(), expect2(TokenType.SEMICOLON));
-        }
-      }
-      return parseBlock();
-    } else if (matches5(TokenType.KEYWORD) && !((_currentToken as KeywordToken)).keyword.isPseudoKeyword) {
-      Keyword keyword = ((_currentToken as KeywordToken)).keyword;
-      if (identical(keyword, Keyword.ASSERT)) {
-        return parseAssertStatement();
-      } else if (identical(keyword, Keyword.BREAK)) {
-        return parseBreakStatement();
-      } else if (identical(keyword, Keyword.CONTINUE)) {
-        return parseContinueStatement();
-      } else if (identical(keyword, Keyword.DO)) {
-        return parseDoStatement();
-      } else if (identical(keyword, Keyword.FOR)) {
-        return parseForStatement();
-      } else if (identical(keyword, Keyword.IF)) {
-        return parseIfStatement();
-      } else if (identical(keyword, Keyword.RETHROW)) {
-        return new ExpressionStatement.full(parseRethrowExpression(), expect2(TokenType.SEMICOLON));
-      } else if (identical(keyword, Keyword.RETURN)) {
-        return parseReturnStatement();
-      } else if (identical(keyword, Keyword.SWITCH)) {
-        return parseSwitchStatement();
-      } else if (identical(keyword, Keyword.THROW)) {
-        return new ExpressionStatement.full(parseThrowExpression(), expect2(TokenType.SEMICOLON));
-      } else if (identical(keyword, Keyword.TRY)) {
-        return parseTryStatement();
-      } else if (identical(keyword, Keyword.WHILE)) {
-        return parseWhileStatement();
-      } else if (identical(keyword, Keyword.VAR) || identical(keyword, Keyword.FINAL)) {
-        return parseVariableDeclarationStatement(commentAndMetadata);
-      } else if (identical(keyword, Keyword.VOID)) {
-        TypeName returnType = parseReturnType();
-        if (matchesIdentifier() && matchesAny(peek(), [
-            TokenType.OPEN_PAREN,
-            TokenType.OPEN_CURLY_BRACKET,
-            TokenType.FUNCTION])) {
-          return parseFunctionDeclarationStatement2(commentAndMetadata, returnType);
-        } else {
-          if (matchesIdentifier()) {
-            if (matchesAny(peek(), [TokenType.EQ, TokenType.COMMA, TokenType.SEMICOLON])) {
-              reportError(ParserErrorCode.VOID_VARIABLE, returnType, []);
-              return parseVariableDeclarationStatement(commentAndMetadata);
-            }
-          } else if (matches5(TokenType.CLOSE_CURLY_BRACKET)) {
-            return parseVariableDeclarationStatement2(commentAndMetadata, null, returnType);
-          }
-          reportError8(ParserErrorCode.MISSING_STATEMENT, []);
-          return new EmptyStatement.full(createSyntheticToken2(TokenType.SEMICOLON));
-        }
-      } else if (identical(keyword, Keyword.CONST)) {
-        if (matchesAny(peek(), [
-            TokenType.LT,
-            TokenType.OPEN_CURLY_BRACKET,
-            TokenType.OPEN_SQUARE_BRACKET,
-            TokenType.INDEX])) {
-          return new ExpressionStatement.full(parseExpression2(), expect2(TokenType.SEMICOLON));
-        } else if (matches4(peek(), TokenType.IDENTIFIER)) {
-          Token afterType = skipTypeName(peek());
-          if (afterType != null) {
-            if (matches4(afterType, TokenType.OPEN_PAREN) || (matches4(afterType, TokenType.PERIOD) && matches4(afterType.next, TokenType.IDENTIFIER) && matches4(afterType.next.next, TokenType.OPEN_PAREN))) {
-              return new ExpressionStatement.full(parseExpression2(), expect2(TokenType.SEMICOLON));
-            }
-          }
-        }
-        return parseVariableDeclarationStatement(commentAndMetadata);
-      } else if (identical(keyword, Keyword.NEW) || identical(keyword, Keyword.TRUE) || identical(keyword, Keyword.FALSE) || identical(keyword, Keyword.NULL) || identical(keyword, Keyword.SUPER) || identical(keyword, Keyword.THIS)) {
-        return new ExpressionStatement.full(parseExpression2(), expect2(TokenType.SEMICOLON));
-      } else {
-        reportError8(ParserErrorCode.MISSING_STATEMENT, []);
-        return new EmptyStatement.full(createSyntheticToken2(TokenType.SEMICOLON));
-      }
-    } else if (matches5(TokenType.SEMICOLON)) {
-      return parseEmptyStatement();
-    } else if (isInitializedVariableDeclaration()) {
-      return parseVariableDeclarationStatement(commentAndMetadata);
-    } else if (isFunctionDeclaration()) {
-      return parseFunctionDeclarationStatement();
-    } else if (matches5(TokenType.CLOSE_CURLY_BRACKET)) {
-      reportError8(ParserErrorCode.MISSING_STATEMENT, []);
-      return new EmptyStatement.full(createSyntheticToken2(TokenType.SEMICOLON));
-    } else {
-      return new ExpressionStatement.full(parseExpression2(), expect2(TokenType.SEMICOLON));
-    }
-  }
-
-  /**
-   * Parse a normal formal parameter.
-   *
-   * <pre>
-   * normalFormalParameter ::=
-   *     functionSignature
-   *   | fieldFormalParameter
-   *   | simpleFormalParameter
-   *
-   * functionSignature:
-   *     metadata returnType? identifier formalParameterList
-   *
-   * fieldFormalParameter ::=
-   *     metadata finalConstVarOrType? 'this' '.' identifier
-   *
-   * simpleFormalParameter ::=
-   *     declaredIdentifier
-   *   | metadata identifier
-   * </pre>
-   *
-   * @return the normal formal parameter that was parsed
-   */
-  NormalFormalParameter parseNormalFormalParameter() {
-    CommentAndMetadata commentAndMetadata = parseCommentAndMetadata();
-    FinalConstVarOrType holder = parseFinalConstVarOrType(true);
-    Token thisKeyword = null;
-    Token period = null;
-    if (matches(Keyword.THIS)) {
-      thisKeyword = andAdvance;
-      period = expect2(TokenType.PERIOD);
-    }
-    SimpleIdentifier identifier = parseSimpleIdentifier();
-    if (matches5(TokenType.OPEN_PAREN)) {
-      FormalParameterList parameters = parseFormalParameterList();
-      if (thisKeyword == null) {
-        if (holder.keyword != null) {
-          reportError9(ParserErrorCode.FUNCTION_TYPED_PARAMETER_VAR, holder.keyword, []);
-        }
-        return new FunctionTypedFormalParameter.full(commentAndMetadata.comment, commentAndMetadata.metadata, holder.type, identifier, parameters);
-      } else {
-        return new FieldFormalParameter.full(commentAndMetadata.comment, commentAndMetadata.metadata, holder.keyword, holder.type, thisKeyword, period, identifier, parameters);
-      }
-    }
-    TypeName type = holder.type;
-    if (type != null) {
-      if (matches3(type.name.beginToken, Keyword.VOID)) {
-        reportError9(ParserErrorCode.VOID_PARAMETER, type.name.beginToken, []);
-      } else if (holder.keyword != null && matches3(holder.keyword, Keyword.VAR)) {
-        reportError9(ParserErrorCode.VAR_AND_TYPE, holder.keyword, []);
-      }
-    }
-    if (thisKeyword != null) {
-      return new FieldFormalParameter.full(commentAndMetadata.comment, commentAndMetadata.metadata, holder.keyword, holder.type, thisKeyword, period, identifier, null);
-    }
-    return new SimpleFormalParameter.full(commentAndMetadata.comment, commentAndMetadata.metadata, holder.keyword, holder.type, identifier);
-  }
-
-  /**
-   * Parse an operator declaration.
-   *
-   * <pre>
-   * operatorDeclaration ::=
-   *     operatorSignature (';' | functionBody)
-   *
-   * operatorSignature ::=
-   *     'external'? returnType? 'operator' operator formalParameterList
-   * </pre>
-   *
-   * @param commentAndMetadata the documentation comment and metadata to be associated with the
-   *          declaration
-   * @param externalKeyword the 'external' token
-   * @param the return type that has already been parsed, or `null` if there was no return
-   *          type
-   * @return the operator declaration that was parsed
-   */
-  MethodDeclaration parseOperator(CommentAndMetadata commentAndMetadata, Token externalKeyword, TypeName returnType) {
-    Token operatorKeyword;
-    if (matches(Keyword.OPERATOR)) {
-      operatorKeyword = andAdvance;
-    } else {
-      reportError9(ParserErrorCode.MISSING_KEYWORD_OPERATOR, _currentToken, []);
-      operatorKeyword = createSyntheticToken(Keyword.OPERATOR);
-    }
-    if (!_currentToken.isUserDefinableOperator) {
-      reportError8(ParserErrorCode.NON_USER_DEFINABLE_OPERATOR, [_currentToken.lexeme]);
-    }
-    SimpleIdentifier name = new SimpleIdentifier.full(andAdvance);
-    if (matches5(TokenType.EQ)) {
-      Token previous = _currentToken.previous;
-      if ((matches4(previous, TokenType.EQ_EQ) || matches4(previous, TokenType.BANG_EQ)) && _currentToken.offset == previous.offset + 2) {
-        reportError8(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) {
-      reportError8(ParserErrorCode.EXTERNAL_OPERATOR_WITH_BODY, []);
-    }
-    return new MethodDeclaration.full(commentAndMetadata.comment, commentAndMetadata.metadata, externalKeyword, null, returnType, null, operatorKeyword, name, 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 (matches(Keyword.VOID)) {
-      return parseReturnType();
-    } else if (matchesIdentifier() && !matches(Keyword.GET) && !matches(Keyword.SET) && !matches(Keyword.OPERATOR) && (matchesIdentifier2(peek()) || matches4(peek(), TokenType.LT))) {
-      return parseReturnType();
-    } else if (matchesIdentifier() && matches4(peek(), TokenType.PERIOD) && matchesIdentifier2(peek2(2)) && (matchesIdentifier2(peek2(3)) || matches4(peek2(3), TokenType.LT))) {
-      return parseReturnType();
-    }
-    return null;
-  }
-
-  /**
-   * Parse a part or part-of directive.
-   *
-   * <pre>
-   * partDirective ::=
-   *     metadata 'part' stringLiteral ';'
-   *
-   * partOfDirective ::=
-   *     metadata 'part' 'of' identifier ';'
-   * </pre>
-   *
-   * @param commentAndMetadata the metadata to be associated with the directive
-   * @return the part or part-of directive that was parsed
-   */
-  Directive parsePartDirective(CommentAndMetadata commentAndMetadata) {
-    Token partKeyword = expect(Keyword.PART);
-    if (matches2(_OF)) {
-      Token ofKeyword = andAdvance;
-      LibraryIdentifier libraryName = parseLibraryName(ParserErrorCode.MISSING_NAME_IN_PART_OF_DIRECTIVE, ofKeyword);
-      Token semicolon = expect2(TokenType.SEMICOLON);
-      return new PartOfDirective.full(commentAndMetadata.comment, commentAndMetadata.metadata, partKeyword, ofKeyword, libraryName, semicolon);
-    }
-    StringLiteral partUri = parseStringLiteral();
-    Token semicolon = expect2(TokenType.SEMICOLON);
-    return new PartDirective.full(commentAndMetadata.comment, commentAndMetadata.metadata, partKeyword, partUri, semicolon);
-  }
-
-  /**
-   * Parse a postfix expression.
-   *
-   * <pre>
-   * postfixExpression ::=
-   *     assignableExpression postfixOperator
-   *   | primary selector*
-   *
-   * selector ::=
-   *     assignableSelector
-   *   | argumentList
-   * </pre>
-   *
-   * @return the postfix expression that was parsed
-   */
-  Expression parsePostfixExpression() {
-    Expression operand = parseAssignableExpression(true);
-    if (matches5(TokenType.OPEN_SQUARE_BRACKET) || matches5(TokenType.PERIOD) || matches5(TokenType.OPEN_PAREN)) {
-      do {
-        if (matches5(TokenType.OPEN_PAREN)) {
-          ArgumentList argumentList = parseArgumentList();
-          if (operand is PropertyAccess) {
-            PropertyAccess access = operand as PropertyAccess;
-            operand = new MethodInvocation.full(access.target, access.operator, access.propertyName, argumentList);
-          } else {
-            operand = new FunctionExpressionInvocation.full(operand, argumentList);
-          }
-        } else {
-          operand = parseAssignableSelector(operand, true);
-        }
-      } while (matches5(TokenType.OPEN_SQUARE_BRACKET) || matches5(TokenType.PERIOD) || matches5(TokenType.OPEN_PAREN));
-      return operand;
-    }
-    if (!_currentToken.type.isIncrementOperator) {
-      return operand;
-    }
-    if (operand is Literal || operand is FunctionExpressionInvocation) {
-      reportError8(ParserErrorCode.MISSING_ASSIGNABLE_SELECTOR, []);
-    }
-    Token operator = andAdvance;
-    return new PostfixExpression.full(operand, operator);
-  }
-
-  /**
-   * Parse a prefixed identifier.
-   *
-   * <pre>
-   * prefixedIdentifier ::=
-   *     identifier ('.' identifier)?
-   * </pre>
-   *
-   * @return the prefixed identifier that was parsed
-   */
-  Identifier parsePrefixedIdentifier() {
-    SimpleIdentifier qualifier = parseSimpleIdentifier();
-    if (!matches5(TokenType.PERIOD)) {
-      return qualifier;
-    }
-    Token period = andAdvance;
-    SimpleIdentifier qualified = parseSimpleIdentifier();
-    return new PrefixedIdentifier.full(qualifier, period, qualified);
-  }
-
-  /**
-   * Parse a primary expression.
-   *
-   * <pre>
-   * primary ::=
-   *     thisExpression
-   *   | 'super' assignableSelector
-   *   | functionExpression
-   *   | literal
-   *   | identifier
-   *   | newExpression
-   *   | constObjectExpression
-   *   | '(' expression ')'
-   *   | argumentDefinitionTest
-   *
-   * literal ::=
-   *     nullLiteral
-   *   | booleanLiteral
-   *   | numericLiteral
-   *   | stringLiteral
-   *   | symbolLiteral
-   *   | mapLiteral
-   *   | listLiteral
-   * </pre>
-   *
-   * @return the primary expression that was parsed
-   */
-  Expression parsePrimaryExpression() {
-    if (matches(Keyword.THIS)) {
-      return new ThisExpression.full(andAdvance);
-    } else if (matches(Keyword.SUPER)) {
-      return parseAssignableSelector(new SuperExpression.full(andAdvance), false);
-    } else if (matches(Keyword.NULL)) {
-      return new NullLiteral.full(andAdvance);
-    } else if (matches(Keyword.FALSE)) {
-      return new BooleanLiteral.full(andAdvance, false);
-    } else if (matches(Keyword.TRUE)) {
-      return new BooleanLiteral.full(andAdvance, true);
-    } else if (matches5(TokenType.DOUBLE)) {
-      Token token = andAdvance;
-      double value = 0.0;
-      try {
-        value = double.parse(token.lexeme);
-      } on FormatException catch (exception) {
-      }
-      return new DoubleLiteral.full(token, value);
-    } else if (matches5(TokenType.HEXADECIMAL)) {
-      Token token = andAdvance;
-      int value = null;
-      try {
-        value = int.parse(token.lexeme.substring(2), radix: 16);
-      } on FormatException catch (exception) {
-      }
-      return new IntegerLiteral.full(token, value);
-    } else if (matches5(TokenType.INT)) {
-      Token token = andAdvance;
-      int value = null;
-      try {
-        value = int.parse(token.lexeme);
-      } on FormatException catch (exception) {
-      }
-      return new IntegerLiteral.full(token, value);
-    } else if (matches5(TokenType.STRING)) {
-      return parseStringLiteral();
-    } else if (matches5(TokenType.OPEN_CURLY_BRACKET)) {
-      return parseMapLiteral(null, null);
-    } else if (matches5(TokenType.OPEN_SQUARE_BRACKET) || matches5(TokenType.INDEX)) {
-      return parseListLiteral(null, null);
-    } else if (matchesIdentifier()) {
-      return parsePrefixedIdentifier();
-    } else if (matches(Keyword.NEW)) {
-      return parseNewExpression();
-    } else if (matches(Keyword.CONST)) {
-      return parseConstExpression();
-    } else if (matches5(TokenType.OPEN_PAREN)) {
-      if (isFunctionExpression(_currentToken)) {
-        return parseFunctionExpression();
-      }
-      Token leftParenthesis = andAdvance;
-      Expression expression = parseExpression2();
-      Token rightParenthesis = expect2(TokenType.CLOSE_PAREN);
-      return new ParenthesizedExpression.full(leftParenthesis, expression, rightParenthesis);
-    } else if (matches5(TokenType.LT)) {
-      return parseListOrMapLiteral(null);
-    } else if (matches5(TokenType.QUESTION)) {
-      return parseArgumentDefinitionTest();
-    } else if (matches(Keyword.VOID)) {
-      reportError8(ParserErrorCode.UNEXPECTED_TOKEN, [_currentToken.lexeme]);
-      advance();
-      return parsePrimaryExpression();
-    } else if (matches5(TokenType.HASH)) {
-      return parseSymbolLiteral();
-    } else {
-      reportError8(ParserErrorCode.MISSING_IDENTIFIER, []);
-      return createSyntheticIdentifier();
-    }
-  }
-
-  /**
-   * Parse a redirecting constructor invocation.
-   *
-   * <pre>
-   * redirectingConstructorInvocation ::=
-   *     'this' ('.' identifier)? arguments
-   * </pre>
-   *
-   * @return the redirecting constructor invocation that was parsed
-   */
-  RedirectingConstructorInvocation parseRedirectingConstructorInvocation() {
-    Token keyword = expect(Keyword.THIS);
-    Token period = null;
-    SimpleIdentifier constructorName = null;
-    if (matches5(TokenType.PERIOD)) {
-      period = andAdvance;
-      constructorName = parseSimpleIdentifier();
-    }
-    ArgumentList argumentList = parseArgumentList();
-    return new RedirectingConstructorInvocation.full(keyword, period, constructorName, argumentList);
-  }
-
-  /**
-   * Parse a relational expression.
-   *
-   * <pre>
-   * relationalExpression ::=
-   *     bitwiseOrExpression ('is' '!'? type | 'as' type | relationalOperator bitwiseOrExpression)?
-   *   | 'super' relationalOperator bitwiseOrExpression
-   * </pre>
-   *
-   * @return the relational expression that was parsed
-   */
-  Expression parseRelationalExpression() {
-    if (matches(Keyword.SUPER) && _currentToken.next.type.isRelationalOperator) {
-      Expression expression = new SuperExpression.full(andAdvance);
-      Token operator = andAdvance;
-      expression = new BinaryExpression.full(expression, operator, parseBitwiseOrExpression());
-      return expression;
-    }
-    Expression expression = parseBitwiseOrExpression();
-    if (matches(Keyword.AS)) {
-      Token asOperator = andAdvance;
-      expression = new AsExpression.full(expression, asOperator, parseTypeName());
-    } else if (matches(Keyword.IS)) {
-      Token isOperator = andAdvance;
-      Token notOperator = null;
-      if (matches5(TokenType.BANG)) {
-        notOperator = andAdvance;
-      }
-      expression = new IsExpression.full(expression, isOperator, notOperator, parseTypeName());
-    } else if (_currentToken.type.isRelationalOperator) {
-      Token operator = andAdvance;
-      expression = new BinaryExpression.full(expression, operator, parseBitwiseOrExpression());
-    }
-    return expression;
-  }
-
-  /**
-   * Parse a rethrow expression.
-   *
-   * <pre>
-   * rethrowExpression ::=
-   *     'rethrow'
-   * </pre>
-   *
-   * @return the rethrow expression that was parsed
-   */
-  Expression parseRethrowExpression() => new RethrowExpression.full(expect(Keyword.RETHROW));
-
-  /**
-   * Parse a return statement.
-   *
-   * <pre>
-   * returnStatement ::=
-   *     'return' expression? ';'
-   * </pre>
-   *
-   * @return the return statement that was parsed
-   */
-  Statement parseReturnStatement() {
-    Token returnKeyword = expect(Keyword.RETURN);
-    if (matches5(TokenType.SEMICOLON)) {
-      return new ReturnStatement.full(returnKeyword, null, andAdvance);
-    }
-    Expression expression = parseExpression2();
-    Token semicolon = expect2(TokenType.SEMICOLON);
-    return new ReturnStatement.full(returnKeyword, expression, semicolon);
-  }
-
-  /**
-   * Parse a return type.
-   *
-   * <pre>
-   * returnType ::=
-   *     'void'
-   *   | type
-   * </pre>
-   *
-   * @return the return type that was parsed
-   */
-  TypeName parseReturnType() {
-    if (matches(Keyword.VOID)) {
-      return new TypeName.full(new SimpleIdentifier.full(andAdvance), null);
-    } else {
-      return parseTypeName();
-    }
-  }
-
-  /**
-   * Parse a setter.
-   *
-   * <pre>
-   * setter ::=
-   *     setterSignature functionBody?
-   *
-   * setterSignature ::=
-   *     'external'? 'static'? returnType? 'set' identifier formalParameterList
-   * </pre>
-   *
-   * @param commentAndMetadata the documentation comment and metadata to be associated with the
-   *          declaration
-   * @param externalKeyword the 'external' token
-   * @param staticKeyword the static keyword, or `null` if the setter is not static
-   * @param the return type that has already been parsed, or `null` if there was no return
-   *          type
-   * @return the setter that was parsed
-   */
-  MethodDeclaration parseSetter(CommentAndMetadata commentAndMetadata, Token externalKeyword, Token staticKeyword, TypeName returnType) {
-    Token propertyKeyword = expect(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) {
-      reportError8(ParserErrorCode.EXTERNAL_SETTER_WITH_BODY, []);
-    }
-    return new MethodDeclaration.full(commentAndMetadata.comment, commentAndMetadata.metadata, externalKeyword, staticKeyword, returnType, propertyKeyword, null, name, parameters, body);
-  }
-
-  /**
-   * Parse a shift expression.
-   *
-   * <pre>
-   * shiftExpression ::=
-   *     additiveExpression (shiftOperator additiveExpression)*
-   *   | 'super' (shiftOperator additiveExpression)+
-   * </pre>
-   *
-   * @return the shift expression that was parsed
-   */
-  Expression parseShiftExpression() {
-    Expression expression;
-    if (matches(Keyword.SUPER) && _currentToken.next.type.isShiftOperator) {
-      expression = new SuperExpression.full(andAdvance);
-    } else {
-      expression = parseAdditiveExpression();
-    }
-    while (_currentToken.type.isShiftOperator) {
-      Token operator = andAdvance;
-      expression = new BinaryExpression.full(expression, operator, parseAdditiveExpression());
-    }
-    return expression;
-  }
-
-  /**
-   * Parse a simple identifier.
-   *
-   * <pre>
-   * identifier ::=
-   *     IDENTIFIER
-   * </pre>
-   *
-   * @return the simple identifier that was parsed
-   */
-  SimpleIdentifier parseSimpleIdentifier() {
-    if (matchesIdentifier()) {
-      return new SimpleIdentifier.full(andAdvance);
-    }
-    reportError8(ParserErrorCode.MISSING_IDENTIFIER, []);
-    return createSyntheticIdentifier();
-  }
-
-  /**
-   * Parse a statement.
-   *
-   * <pre>
-   * statement ::=
-   *     label* nonLabeledStatement
-   * </pre>
-   *
-   * @return the statement that was parsed
-   */
-  Statement parseStatement2() {
-    List<Label> labels = new List<Label>();
-    while (matchesIdentifier() && matches4(peek(), TokenType.COLON)) {
-      SimpleIdentifier label = parseSimpleIdentifier();
-      Token colon = expect2(TokenType.COLON);
-      labels.add(new Label.full(label, colon));
-    }
-    Statement statement = parseNonLabeledStatement();
-    if (labels.isEmpty) {
-      return statement;
-    }
-    return new LabeledStatement.full(labels, statement);
-  }
-
-  /**
-   * Parse a list of statements within a switch statement.
-   *
-   * <pre>
-   * statements ::=
-   *     statement*
-   * </pre>
-   *
-   * @return the statements that were parsed
-   */
-  List<Statement> parseStatements2() {
-    List<Statement> statements = new List<Statement>();
-    Token statementStart = _currentToken;
-    while (!matches5(TokenType.EOF) && !matches5(TokenType.CLOSE_CURLY_BRACKET) && !isSwitchMember()) {
-      statements.add(parseStatement2());
-      if (identical(_currentToken, statementStart)) {
-        reportError9(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 = matches5(TokenType.STRING_INTERPOLATION_EXPRESSION) || matches5(TokenType.STRING_INTERPOLATION_IDENTIFIER);
-    elements.add(new InterpolationString.full(string, computeStringValue(string.lexeme, true, !hasMore)));
-    while (hasMore) {
-      if (matches5(TokenType.STRING_INTERPOLATION_EXPRESSION)) {
-        Token openToken = andAdvance;
-        Expression expression = parseExpression2();
-        Token rightBracket = expect2(TokenType.CLOSE_CURLY_BRACKET);
-        elements.add(new InterpolationExpression.full(openToken, expression, rightBracket));
-      } else {
-        Token openToken = andAdvance;
-        Expression expression = null;
-        if (matches(Keyword.THIS)) {
-          expression = new ThisExpression.full(andAdvance);
-        } else {
-          expression = parseSimpleIdentifier();
-        }
-        elements.add(new InterpolationExpression.full(openToken, expression, null));
-      }
-      if (matches5(TokenType.STRING)) {
-        string = andAdvance;
-        hasMore = matches5(TokenType.STRING_INTERPOLATION_EXPRESSION) || matches5(TokenType.STRING_INTERPOLATION_IDENTIFIER);
-        elements.add(new InterpolationString.full(string, computeStringValue(string.lexeme, false, !hasMore)));
-      }
-    }
-    return new StringInterpolation.full(elements);
-  }
-
-  /**
-   * Parse a string literal.
-   *
-   * <pre>
-   * stringLiteral ::=
-   *     MULTI_LINE_STRING+
-   *   | SINGLE_LINE_STRING+
-   * </pre>
-   *
-   * @return the string literal that was parsed
-   */
-  StringLiteral parseStringLiteral() {
-    List<StringLiteral> strings = new List<StringLiteral>();
-    while (matches5(TokenType.STRING)) {
-      Token string = andAdvance;
-      if (matches5(TokenType.STRING_INTERPOLATION_EXPRESSION) || matches5(TokenType.STRING_INTERPOLATION_IDENTIFIER)) {
-        strings.add(parseStringInterpolation(string));
-      } else {
-        strings.add(new SimpleStringLiteral.full(string, computeStringValue(string.lexeme, true, true)));
-      }
-    }
-    if (strings.length < 1) {
-      reportError8(ParserErrorCode.EXPECTED_STRING_LITERAL, []);
-      return createSyntheticStringLiteral();
-    } else if (strings.length == 1) {
-      return strings[0];
-    } else {
-      return new AdjacentStrings.full(strings);
-    }
-  }
-
-  /**
-   * Parse a super constructor invocation.
-   *
-   * <pre>
-   * superConstructorInvocation ::=
-   *     'super' ('.' identifier)? arguments
-   * </pre>
-   *
-   * @return the super constructor invocation that was parsed
-   */
-  SuperConstructorInvocation parseSuperConstructorInvocation() {
-    Token keyword = expect(Keyword.SUPER);
-    Token period = null;
-    SimpleIdentifier constructorName = null;
-    if (matches5(TokenType.PERIOD)) {
-      period = andAdvance;
-      constructorName = parseSimpleIdentifier();
-    }
-    ArgumentList argumentList = parseArgumentList();
-    return new SuperConstructorInvocation.full(keyword, period, constructorName, argumentList);
-  }
-
-  /**
-   * Parse a switch statement.
-   *
-   * <pre>
-   * switchStatement ::=
-   *     'switch' '(' expression ')' '{' switchCase* defaultCase? '}'
-   *
-   * switchCase ::=
-   *     label* ('case' expression ':') statements
-   *
-   * defaultCase ::=
-   *     label* 'default' ':' statements
-   * </pre>
-   *
-   * @return the switch statement that was parsed
-   */
-  SwitchStatement parseSwitchStatement() {
-    bool wasInSwitch = _inSwitch;
-    _inSwitch = true;
-    try {
-      Set<String> definedLabels = new Set<String>();
-      Token keyword = expect(Keyword.SWITCH);
-      Token leftParenthesis = expect2(TokenType.OPEN_PAREN);
-      Expression expression = parseExpression2();
-      Token rightParenthesis = expect2(TokenType.CLOSE_PAREN);
-      Token leftBracket = expect2(TokenType.OPEN_CURLY_BRACKET);
-      Token defaultKeyword = null;
-      List<SwitchMember> members = new List<SwitchMember>();
-      while (!matches5(TokenType.EOF) && !matches5(TokenType.CLOSE_CURLY_BRACKET)) {
-        List<Label> labels = new List<Label>();
-        while (matchesIdentifier() && matches4(peek(), TokenType.COLON)) {
-          SimpleIdentifier identifier = parseSimpleIdentifier();
-          String label = identifier.token.lexeme;
-          if (definedLabels.contains(label)) {
-            reportError9(ParserErrorCode.DUPLICATE_LABEL_IN_SWITCH_STATEMENT, identifier.token, [label]);
-          } else {
-            javaSetAdd(definedLabels, label);
-          }
-          Token colon = expect2(TokenType.COLON);
-          labels.add(new Label.full(identifier, colon));
-        }
-        if (matches(Keyword.CASE)) {
-          Token caseKeyword = andAdvance;
-          Expression caseExpression = parseExpression2();
-          Token colon = expect2(TokenType.COLON);
-          members.add(new SwitchCase.full(labels, caseKeyword, caseExpression, colon, parseStatements2()));
-          if (defaultKeyword != null) {
-            reportError9(ParserErrorCode.SWITCH_HAS_CASE_AFTER_DEFAULT_CASE, caseKeyword, []);
-          }
-        } else if (matches(Keyword.DEFAULT)) {
-          if (defaultKeyword != null) {
-            reportError9(ParserErrorCode.SWITCH_HAS_MULTIPLE_DEFAULT_CASES, peek(), []);
-          }
-          defaultKeyword = andAdvance;
-          Token colon = expect2(TokenType.COLON);
-          members.add(new SwitchDefault.full(labels, defaultKeyword, colon, parseStatements2()));
-        } else {
-          reportError8(ParserErrorCode.EXPECTED_CASE_OR_DEFAULT, []);
-          while (!matches5(TokenType.EOF) && !matches5(TokenType.CLOSE_CURLY_BRACKET) && !matches(Keyword.CASE) && !matches(Keyword.DEFAULT)) {
-            advance();
-          }
-        }
-      }
-      Token rightBracket = expect2(TokenType.CLOSE_CURLY_BRACKET);
-      return new SwitchStatement.full(keyword, leftParenthesis, expression, rightParenthesis, leftBracket, members, rightBracket);
-    } finally {
-      _inSwitch = wasInSwitch;
-    }
-  }
-
-  /**
-   * Parse a symbol literal.
-   *
-   * <pre>
-   * symbolLiteral ::=
-   *     '#' identifier ('.' identifier)*
-   * </pre>
-   *
-   * @return the symbol literal that was parsed
-   */
-  SymbolLiteral parseSymbolLiteral() {
-    Token poundSign = andAdvance;
-    List<Token> components = new List<Token>();
-    if (matchesIdentifier()) {
-      components.add(andAdvance);
-      while (matches5(TokenType.PERIOD)) {
-        advance();
-        if (matchesIdentifier()) {
-          components.add(andAdvance);
-        } else {
-          reportError8(ParserErrorCode.MISSING_IDENTIFIER, []);
-          components.add(createSyntheticToken2(TokenType.IDENTIFIER));
-          break;
-        }
-      }
-    } else if (_currentToken.isOperator) {
-      components.add(andAdvance);
-    } else {
-      reportError8(ParserErrorCode.MISSING_IDENTIFIER, []);
-      components.add(createSyntheticToken2(TokenType.IDENTIFIER));
-    }
-    return new SymbolLiteral.full(poundSign, new List.from(components));
-  }
-
-  /**
-   * Parse a throw expression.
-   *
-   * <pre>
-   * throwExpression ::=
-   *     'throw' expression
-   * </pre>
-   *
-   * @return the throw expression that was parsed
-   */
-  Expression parseThrowExpression() {
-    Token keyword = expect(Keyword.THROW);
-    if (matches5(TokenType.SEMICOLON) || matches5(TokenType.CLOSE_PAREN)) {
-      reportError9(ParserErrorCode.MISSING_EXPRESSION_IN_THROW, _currentToken, []);
-      return new ThrowExpression.full(keyword, createSyntheticIdentifier());
-    }
-    Expression expression = parseExpression2();
-    return new ThrowExpression.full(keyword, expression);
-  }
-
-  /**
-   * Parse a throw expression.
-   *
-   * <pre>
-   * throwExpressionWithoutCascade ::=
-   *     'throw' expressionWithoutCascade
-   * </pre>
-   *
-   * @return the throw expression that was parsed
-   */
-  Expression parseThrowExpressionWithoutCascade() {
-    Token keyword = expect(Keyword.THROW);
-    if (matches5(TokenType.SEMICOLON) || matches5(TokenType.CLOSE_PAREN)) {
-      reportError9(ParserErrorCode.MISSING_EXPRESSION_IN_THROW, _currentToken, []);
-      return new ThrowExpression.full(keyword, createSyntheticIdentifier());
-    }
-    Expression expression = parseExpressionWithoutCascade();
-    return new ThrowExpression.full(keyword, expression);
-  }
-
-  /**
-   * Parse a try statement.
-   *
-   * <pre>
-   * tryStatement ::=
-   *     'try' block (onPart+ finallyPart? | finallyPart)
-   *
-   * onPart ::=
-   *     catchPart block
-   *   | 'on' type catchPart? block
-   *
-   * catchPart ::=
-   *     'catch' '(' identifier (',' identifier)? ')'
-   *
-   * finallyPart ::=
-   *     'finally' block
-   * </pre>
-   *
-   * @return the try statement that was parsed
-   */
-  Statement parseTryStatement() {
-    Token tryKeyword = expect(Keyword.TRY);
-    Block body = parseBlock();
-    List<CatchClause> catchClauses = new List<CatchClause>();
-    Block finallyClause = null;
-    while (matches2(_ON) || matches(Keyword.CATCH)) {
-      Token onKeyword = null;
-      TypeName exceptionType = null;
-      if (matches2(_ON)) {
-        onKeyword = andAdvance;
-        exceptionType = parseTypeName();
-      }
-      Token catchKeyword = null;
-      Token leftParenthesis = null;
-      SimpleIdentifier exceptionParameter = null;
-      Token comma = null;
-      SimpleIdentifier stackTraceParameter = null;
-      Token rightParenthesis = null;
-      if (matches(Keyword.CATCH)) {
-        catchKeyword = andAdvance;
-        leftParenthesis = expect2(TokenType.OPEN_PAREN);
-        exceptionParameter = parseSimpleIdentifier();
-        if (matches5(TokenType.COMMA)) {
-          comma = andAdvance;
-          stackTraceParameter = parseSimpleIdentifier();
-        }
-        rightParenthesis = expect2(TokenType.CLOSE_PAREN);
-      }
-      Block catchBody = parseBlock();
-      catchClauses.add(new CatchClause.full(onKeyword, exceptionType, catchKeyword, leftParenthesis, exceptionParameter, comma, stackTraceParameter, rightParenthesis, catchBody));
-    }
-    Token finallyKeyword = null;
-    if (matches(Keyword.FINALLY)) {
-      finallyKeyword = andAdvance;
-      finallyClause = parseBlock();
-    } else {
-      if (catchClauses.isEmpty) {
-        reportError8(ParserErrorCode.MISSING_CATCH_OR_FINALLY, []);
-      }
-    }
-    return new TryStatement.full(tryKeyword, body, catchClauses, finallyKeyword, finallyClause);
-  }
-
-  /**
-   * Parse a type alias.
-   *
-   * <pre>
-   * typeAlias ::=
-   *     'typedef' typeAliasBody
-   *
-   * typeAliasBody ::=
-   *     classTypeAlias
-   *   | functionTypeAlias
-   *
-   * classTypeAlias ::=
-   *     identifier typeParameters? '=' 'abstract'? mixinApplication
-   *
-   * mixinApplication ::=
-   *     qualified withClause implementsClause? ';'
-   *
-   * functionTypeAlias ::=
-   *     functionPrefix typeParameterList? formalParameterList ';'
-   *
-   * functionPrefix ::=
-   *     returnType? name
-   * </pre>
-   *
-   * @param commentAndMetadata the metadata to be associated with the member
-   * @return the type alias that was parsed
-   */
-  TypeAlias parseTypeAlias(CommentAndMetadata commentAndMetadata) {
-    Token keyword = expect(Keyword.TYPEDEF);
-    if (matchesIdentifier()) {
-      Token next = peek();
-      if (matches4(next, TokenType.LT)) {
-        next = skipTypeParameterList(next);
-        if (next != null && matches4(next, TokenType.EQ)) {
-          TypeAlias typeAlias = parseClassTypeAlias(commentAndMetadata, keyword);
-          reportError9(ParserErrorCode.DEPRECATED_CLASS_TYPE_ALIAS, keyword, []);
-          return typeAlias;
-        }
-      } else if (matches4(next, TokenType.EQ)) {
-        TypeAlias typeAlias = parseClassTypeAlias(commentAndMetadata, keyword);
-        reportError9(ParserErrorCode.DEPRECATED_CLASS_TYPE_ALIAS, keyword, []);
-        return typeAlias;
-      }
-    }
-    return parseFunctionTypeAlias(commentAndMetadata, keyword);
-  }
-
-  /**
-   * Parse a list of type arguments.
-   *
-   * <pre>
-   * typeArguments ::=
-   *     '<' typeList '>'
-   *
-   * typeList ::=
-   *     type (',' type)*
-   * </pre>
-   *
-   * @return the type argument list that was parsed
-   */
-  TypeArgumentList parseTypeArgumentList() {
-    Token leftBracket = expect2(TokenType.LT);
-    List<TypeName> arguments = new List<TypeName>();
-    arguments.add(parseTypeName());
-    while (optional(TokenType.COMMA)) {
-      arguments.add(parseTypeName());
-    }
-    Token rightBracket = expect2(TokenType.GT);
-    return new TypeArgumentList.full(leftBracket, arguments, rightBracket);
-  }
-
-  /**
-   * Parse a type name.
-   *
-   * <pre>
-   * type ::=
-   *     qualified typeArguments?
-   * </pre>
-   *
-   * @return the type name that was parsed
-   */
-  TypeName parseTypeName() {
-    Identifier typeName;
-    if (matches(Keyword.VAR)) {
-      reportError8(ParserErrorCode.VAR_AS_TYPE_NAME, []);
-      typeName = new SimpleIdentifier.full(andAdvance);
-    } else if (matchesIdentifier()) {
-      typeName = parsePrefixedIdentifier();
-    } else {
-      typeName = createSyntheticIdentifier();
-      reportError8(ParserErrorCode.EXPECTED_TYPE_NAME, []);
-    }
-    TypeArgumentList typeArguments = null;
-    if (matches5(TokenType.LT)) {
-      typeArguments = parseTypeArgumentList();
-    }
-    return new TypeName.full(typeName, typeArguments);
-  }
-
-  /**
-   * Parse a type parameter.
-   *
-   * <pre>
-   * typeParameter ::=
-   *     metadata name ('extends' bound)?
-   * </pre>
-   *
-   * @return the type parameter that was parsed
-   */
-  TypeParameter parseTypeParameter() {
-    CommentAndMetadata commentAndMetadata = parseCommentAndMetadata();
-    SimpleIdentifier name = parseSimpleIdentifier();
-    if (matches(Keyword.EXTENDS)) {
-      Token keyword = andAdvance;
-      TypeName bound = parseTypeName();
-      return new TypeParameter.full(commentAndMetadata.comment, commentAndMetadata.metadata, name, keyword, bound);
-    }
-    return new TypeParameter.full(commentAndMetadata.comment, commentAndMetadata.metadata, name, null, null);
-  }
-
-  /**
-   * Parse a list of type parameters.
-   *
-   * <pre>
-   * typeParameterList ::=
-   *     '<' typeParameter (',' typeParameter)* '>'
-   * </pre>
-   *
-   * @return the list of type parameters that were parsed
-   */
-  TypeParameterList parseTypeParameterList() {
-    Token leftBracket = expect2(TokenType.LT);
-    List<TypeParameter> typeParameters = new List<TypeParameter>();
-    typeParameters.add(parseTypeParameter());
-    while (optional(TokenType.COMMA)) {
-      typeParameters.add(parseTypeParameter());
-    }
-    Token rightBracket = expect2(TokenType.GT);
-    return new TypeParameterList.full(leftBracket, typeParameters, rightBracket);
-  }
-
-  /**
-   * Parse a unary expression.
-   *
-   * <pre>
-   * unaryExpression ::=
-   *     prefixOperator unaryExpression
-   *   | postfixExpression
-   *   | unaryOperator 'super'
-   *   | '-' 'super'
-   *   | incrementOperator assignableExpression
-   * </pre>
-   *
-   * @return the unary expression that was parsed
-   */
-  Expression parseUnaryExpression() {
-    if (matches5(TokenType.MINUS) || matches5(TokenType.BANG) || matches5(TokenType.TILDE)) {
-      Token operator = andAdvance;
-      if (matches(Keyword.SUPER)) {
-        if (matches4(peek(), TokenType.OPEN_SQUARE_BRACKET) || matches4(peek(), TokenType.PERIOD)) {
-          return new PrefixExpression.full(operator, parseUnaryExpression());
-        }
-        return new PrefixExpression.full(operator, new SuperExpression.full(andAdvance));
-      }
-      return new PrefixExpression.full(operator, parseUnaryExpression());
-    } else if (_currentToken.type.isIncrementOperator) {
-      Token operator = andAdvance;
-      if (matches(Keyword.SUPER)) {
-        if (matches4(peek(), TokenType.OPEN_SQUARE_BRACKET) || matches4(peek(), TokenType.PERIOD)) {
-          return new PrefixExpression.full(operator, parseUnaryExpression());
-        }
-        if (identical(operator.type, TokenType.MINUS_MINUS)) {
-          int offset = operator.offset;
-          Token firstOperator = new Token(TokenType.MINUS, offset);
-          Token secondOperator = new Token(TokenType.MINUS, offset + 1);
-          secondOperator.setNext(_currentToken);
-          firstOperator.setNext(secondOperator);
-          operator.previous.setNext(firstOperator);
-          return new PrefixExpression.full(firstOperator, new PrefixExpression.full(secondOperator, new SuperExpression.full(andAdvance)));
-        } else {
-          reportError8(ParserErrorCode.INVALID_OPERATOR_FOR_SUPER, [operator.lexeme]);
-          return new PrefixExpression.full(operator, new SuperExpression.full(andAdvance));
-        }
-      }
-      return new PrefixExpression.full(operator, parseAssignableExpression(false));
-    } else if (matches5(TokenType.PLUS)) {
-      reportError8(ParserErrorCode.MISSING_IDENTIFIER, []);
-      return createSyntheticIdentifier();
-    }
-    return parsePostfixExpression();
-  }
-
-  /**
-   * Parse a variable declaration.
-   *
-   * <pre>
-   * variableDeclaration ::=
-   *     identifier ('=' expression)?
-   * </pre>
-   *
-   * @return the variable declaration that was parsed
-   */
-  VariableDeclaration parseVariableDeclaration() {
-    CommentAndMetadata commentAndMetadata = parseCommentAndMetadata();
-    SimpleIdentifier name = parseSimpleIdentifier();
-    Token equals = null;
-    Expression initializer = null;
-    if (matches5(TokenType.EQ)) {
-      equals = andAdvance;
-      initializer = parseExpression2();
-    }
-    return new VariableDeclaration.full(commentAndMetadata.comment, commentAndMetadata.metadata, name, equals, initializer);
-  }
-
-  /**
-   * Parse a variable declaration list.
-   *
-   * <pre>
-   * variableDeclarationList ::=
-   *     finalConstVarOrType variableDeclaration (',' variableDeclaration)*
-   * </pre>
-   *
-   * @param commentAndMetadata the metadata to be associated with the variable declaration list
-   * @return the variable declaration list that was parsed
-   */
-  VariableDeclarationList parseVariableDeclarationList(CommentAndMetadata commentAndMetadata) {
-    FinalConstVarOrType holder = parseFinalConstVarOrType(false);
-    return parseVariableDeclarationList2(commentAndMetadata, holder.keyword, holder.type);
-  }
-
-  /**
-   * Parse a variable declaration list.
-   *
-   * <pre>
-   * variableDeclarationList ::=
-   *     finalConstVarOrType variableDeclaration (',' variableDeclaration)*
-   * </pre>
-   *
-   * @param commentAndMetadata the metadata to be associated with the variable declaration list, or
-   *          `null` if there is no attempt at parsing the comment and metadata
-   * @param keyword the token representing the 'final', 'const' or 'var' keyword, or `null` if
-   *          there is no keyword
-   * @param type the type of the variables in the list
-   * @return the variable declaration list that was parsed
-   */
-  VariableDeclarationList parseVariableDeclarationList2(CommentAndMetadata commentAndMetadata, Token keyword, TypeName type) {
-    if (type != null && keyword != null && matches3(keyword, Keyword.VAR)) {
-      reportError9(ParserErrorCode.VAR_AND_TYPE, keyword, []);
-    }
-    List<VariableDeclaration> variables = new List<VariableDeclaration>();
-    variables.add(parseVariableDeclaration());
-    while (matches5(TokenType.COMMA)) {
-      advance();
-      variables.add(parseVariableDeclaration());
-    }
-    return new VariableDeclarationList.full(commentAndMetadata != null ? commentAndMetadata.comment : null, commentAndMetadata != null ? commentAndMetadata.metadata : null, keyword, type, variables);
-  }
-
-  /**
-   * Parse a variable declaration statement.
-   *
-   * <pre>
-   * variableDeclarationStatement ::=
-   *     variableDeclarationList ';'
-   * </pre>
-   *
-   * @param commentAndMetadata 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 parseVariableDeclarationStatement(CommentAndMetadata commentAndMetadata) {
-    VariableDeclarationList variableList = parseVariableDeclarationList(commentAndMetadata);
-    Token semicolon = expect2(TokenType.SEMICOLON);
-    return new VariableDeclarationStatement.full(variableList, semicolon);
-  }
-
-  /**
-   * Parse a variable declaration statement.
-   *
-   * <pre>
-   * variableDeclarationStatement ::=
-   *     variableDeclarationList ';'
-   * </pre>
-   *
-   * @param commentAndMetadata the metadata to be associated with the variable declaration
-   *          statement, or `null` if there is no attempt at parsing the comment and metadata
-   * @param keyword the token representing the 'final', 'const' or 'var' keyword, or `null` if
-   *          there is no keyword
-   * @param type the type of the variables in the list
-   * @return the variable declaration statement that was parsed
-   */
-  VariableDeclarationStatement parseVariableDeclarationStatement2(CommentAndMetadata commentAndMetadata, Token keyword, TypeName type) {
-    VariableDeclarationList variableList = parseVariableDeclarationList2(commentAndMetadata, keyword, type);
-    Token semicolon = expect2(TokenType.SEMICOLON);
-    return new VariableDeclarationStatement.full(variableList, semicolon);
-  }
-
-  /**
-   * Parse a while statement.
-   *
-   * <pre>
-   * whileStatement ::=
-   *     'while' '(' expression ')' statement
-   * </pre>
-   *
-   * @return the while statement that was parsed
-   */
-  Statement parseWhileStatement() {
-    bool wasInLoop = _inLoop;
-    _inLoop = true;
-    try {
-      Token keyword = expect(Keyword.WHILE);
-      Token leftParenthesis = expect2(TokenType.OPEN_PAREN);
-      Expression condition = parseExpression2();
-      Token rightParenthesis = expect2(TokenType.CLOSE_PAREN);
-      Statement body = parseStatement2();
-      return new WhileStatement.full(keyword, leftParenthesis, condition, rightParenthesis, body);
-    } finally {
-      _inLoop = wasInLoop;
-    }
-  }
-
-  /**
-   * Parse a with clause.
-   *
-   * <pre>
-   * withClause ::=
-   *     'with' typeName (',' typeName)*
-   * </pre>
-   *
-   * @return the with clause that was parsed
-   */
-  WithClause parseWithClause() {
-    Token with2 = expect(Keyword.WITH);
-    List<TypeName> types = new List<TypeName>();
-    types.add(parseTypeName());
-    while (optional(TokenType.COMMA)) {
-      types.add(parseTypeName());
-    }
-    return new WithClause.full(with2, types);
-  }
-
-  /**
-   * Return the token that is immediately after the current token. This is equivalent to
-   * [peek].
-   *
-   * @return the token that is immediately after the current token
-   */
-  Token peek() => _currentToken.next;
-
-  /**
-   * Return the token that is the given distance after the current token.
-   *
-   * @param distance the number of tokens to look ahead, where `0` is the current token,
-   *          `1` is the next token, etc.
-   * @return the token that is the given distance after the current token
-   */
-  Token peek2(int distance) {
-    Token token = _currentToken;
-    for (int i = 0; i < distance; i++) {
-      token = token.next;
-    }
-    return token;
-  }
-
-  /**
-   * Report an error with the given error code and arguments.
-   *
-   * @param errorCode the error code of the error to be reported
-   * @param node the node specifying the location of the error
-   * @param arguments the arguments to the error, used to compose the error message
-   */
-  void reportError(ParserErrorCode errorCode, ASTNode node, List<Object> arguments) {
-    _errorListener.onError(new AnalysisError.con2(_source, node.offset, node.length, errorCode, arguments));
-  }
-
-  /**
-   * Report an error with the given error code and arguments.
-   *
-   * @param errorCode the error code of the error to be reported
-   * @param arguments the arguments to the error, used to compose the error message
-   */
-  void reportError8(ParserErrorCode errorCode, List<Object> arguments) {
-    reportError9(errorCode, _currentToken, arguments);
-  }
-
-  /**
-   * Report an error with the given error code and arguments.
-   *
-   * @param errorCode the error code of the error to be reported
-   * @param token the token specifying the location of the error
-   * @param arguments the arguments to the error, used to compose the error message
-   */
-  void reportError9(ParserErrorCode errorCode, Token token, List<Object> arguments) {
-    _errorListener.onError(new AnalysisError.con2(_source, token.offset, token.length, errorCode, arguments));
-  }
-
-  /**
-   * Look for user defined tasks in comments and convert them into info level analysis issues.
-   *
-   * @param commentToken the comment token to analyze
-   */
-  void scrapeTodoComment(Token commentToken) {
-    JavaPatternMatcher matcher = new JavaPatternMatcher(TodoCode.TODO_REGEX, commentToken.lexeme);
-    if (matcher.find()) {
-      int offset = commentToken.offset + matcher.start() + matcher.group(1).length;
-      int length = matcher.group(2).length;
-      // _errorListener.onError(new AnalysisError.con2(_source, offset, length, TodoCode.TODO, [matcher.group(2)]));
-    }
-  }
-
-  /**
-   * 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.
-   *
-   * <pre>
-   * finalConstVarOrType ::=
-   *   | 'final' type?
-   *   | 'const' type?
-   *   | 'var'
-   *   | type
-   * </pre>
-   *
-   * @param startToken the token at which parsing is to begin
-   * @return the token following the type that was parsed
-   */
-  Token skipFinalConstVarOrType(Token startToken) {
-    if (matches3(startToken, Keyword.FINAL) || matches3(startToken, Keyword.CONST)) {
-      Token next = startToken.next;
-      if (matchesIdentifier2(next.next) || matches4(next.next, TokenType.LT) || matches3(next.next, Keyword.THIS)) {
-        return skipTypeName(next);
-      }
-    } else if (matches3(startToken, Keyword.VAR)) {
-      return startToken.next;
-    } else if (matchesIdentifier2(startToken)) {
-      Token next = startToken.next;
-      if (matchesIdentifier2(next) || matches4(next, TokenType.LT) || matches3(next, Keyword.THIS) || (matches4(next, TokenType.PERIOD) && matchesIdentifier2(next.next) && (matchesIdentifier2(next.next.next) || matches4(next.next.next, TokenType.LT) || matches3(next.next.next, Keyword.THIS)))) {
-        return skipReturnType(startToken);
-      }
-    }
-    return null;
-  }
-
-  /**
-   * Parse a list of formal parameters, starting at the given token, 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].
-   *
-   * <pre>
-   * formalParameterList ::=
-   *     '(' ')'
-   *   | '(' normalFormalParameters (',' optionalFormalParameters)? ')'
-   *   | '(' optionalFormalParameters ')'
-   *
-   * normalFormalParameters ::=
-   *     normalFormalParameter (',' normalFormalParameter)*
-   *
-   * optionalFormalParameters ::=
-   *     optionalPositionalFormalParameters
-   *   | namedFormalParameters
-   *
-   * optionalPositionalFormalParameters ::=
-   *     '[' defaultFormalParameter (',' defaultFormalParameter)* ']'
-   *
-   * namedFormalParameters ::=
-   *     '{' defaultNamedParameter (',' defaultNamedParameter)* '}'
-   * </pre>
-   *
-   * @param startToken the token at which parsing is to begin
-   * @return the token following the formal parameter list that was parsed
-   */
-  Token skipFormalParameterList(Token startToken) {
-    if (!matches4(startToken, TokenType.OPEN_PAREN)) {
-      return null;
-    }
-    Token next = startToken.next;
-    if (matches4(next, TokenType.CLOSE_PAREN)) {
-      return next.next;
-    }
-    if (matchesAny(next, [
-        TokenType.AT,
-        TokenType.OPEN_SQUARE_BRACKET,
-        TokenType.OPEN_CURLY_BRACKET]) || matches3(next, Keyword.VOID) || (matchesIdentifier2(next) && (matchesAny(next.next, [TokenType.COMMA, TokenType.CLOSE_PAREN])))) {
-      return skipPastMatchingToken(startToken);
-    }
-    if (matchesIdentifier2(next) && matches4(next.next, TokenType.OPEN_PAREN)) {
-      Token afterParameters = skipFormalParameterList(next.next);
-      if (afterParameters != null && (matchesAny(afterParameters, [TokenType.COMMA, TokenType.CLOSE_PAREN]))) {
-        return skipPastMatchingToken(startToken);
-      }
-    }
-    Token afterType = skipFinalConstVarOrType(next);
-    if (afterType == null) {
-      return null;
-    }
-    if (skipSimpleIdentifier(afterType) == null) {
-      return null;
-    }
-    return skipPastMatchingToken(startToken);
-  }
-
-  /**
-   * If the given token is a begin token with an associated end token, then return the token
-   * following the end token. Otherwise, return `null`.
-   *
-   * @param startToken the token that is assumed to be a being token
-   * @return the token following the matching end token
-   */
-  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 given token, 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].
-   *
-   * <pre>
-   * prefixedIdentifier ::=
-   *     identifier ('.' identifier)?
-   * </pre>
-   *
-   * @param startToken the token at which parsing is to begin
-   * @return the token following the prefixed identifier that was parsed
-   */
-  Token skipPrefixedIdentifier(Token startToken) {
-    Token token = skipSimpleIdentifier(startToken);
-    if (token == null) {
-      return null;
-    } else if (!matches4(token, TokenType.PERIOD)) {
-      return token;
-    }
-    return skipSimpleIdentifier(token.next);
-  }
-
-  /**
-   * Parse a return type, starting at the given token, 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].
-   *
-   * <pre>
-   * returnType ::=
-   *     'void'
-   *   | type
-   * </pre>
-   *
-   * @param startToken the token at which parsing is to begin
-   * @return the token following the return type that was parsed
-   */
-  Token skipReturnType(Token startToken) {
-    if (matches3(startToken, Keyword.VOID)) {
-      return startToken.next;
-    } else {
-      return skipTypeName(startToken);
-    }
-  }
-
-  /**
-   * Parse a simple identifier, starting at the given token, 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].
-   *
-   * <pre>
-   * identifier ::=
-   *     IDENTIFIER
-   * </pre>
-   *
-   * @param startToken the token at which parsing is to begin
-   * @return the token following the simple identifier that was parsed
-   */
-  Token skipSimpleIdentifier(Token startToken) {
-    if (matches4(startToken, TokenType.IDENTIFIER) || (matches4(startToken, TokenType.KEYWORD) && ((startToken as KeywordToken)).keyword.isPseudoKeyword)) {
-      return startToken.next;
-    }
-    return null;
-  }
-
-  /**
-   * Parse a string literal that contains interpolations, starting at the given token, 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].
-   *
-   * @param startToken the token at which parsing is to begin
-   * @return the string literal that was parsed
-   */
-  Token skipStringInterpolation(Token startToken) {
-    Token token = startToken;
-    TokenType type = token.type;
-    while (identical(type, TokenType.STRING_INTERPOLATION_EXPRESSION) || identical(type, TokenType.STRING_INTERPOLATION_IDENTIFIER)) {
-      if (identical(type, TokenType.STRING_INTERPOLATION_EXPRESSION)) {
-        token = token.next;
-        type = token.type;
-        int bracketNestingLevel = 1;
-        while (bracketNestingLevel > 0) {
-          if (identical(type, TokenType.EOF)) {
-            return null;
-          } else if (identical(type, TokenType.OPEN_CURLY_BRACKET)) {
-            bracketNestingLevel++;
-          } else if (identical(type, TokenType.CLOSE_CURLY_BRACKET)) {
-            bracketNestingLevel--;
-          } else if (identical(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 (identical(type, TokenType.STRING)) {
-        token = token.next;
-        type = token.type;
-      }
-    }
-    return token;
-  }
-
-  /**
-   * Parse a string literal, starting at the given token, 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].
-   *
-   * <pre>
-   * stringLiteral ::=
-   *     MULTI_LINE_STRING+
-   *   | SINGLE_LINE_STRING+
-   * </pre>
-   *
-   * @param startToken the token at which parsing is to begin
-   * @return the token following the string literal that was parsed
-   */
-  Token skipStringLiteral(Token startToken) {
-    Token token = startToken;
-    while (token != null && matches4(token, TokenType.STRING)) {
-      token = token.next;
-      TokenType type = token.type;
-      if (identical(type, TokenType.STRING_INTERPOLATION_EXPRESSION) || identical(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 given token, 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].
-   *
-   * <pre>
-   * typeArguments ::=
-   *     '<' typeList '>'
-   *
-   * typeList ::=
-   *     type (',' type)*
-   * </pre>
-   *
-   * @param startToken the token at which parsing is to begin
-   * @return the token following the type argument list that was parsed
-   */
-  Token skipTypeArgumentList(Token startToken) {
-    Token token = startToken;
-    if (!matches4(token, TokenType.LT)) {
-      return null;
-    }
-    token = skipTypeName(token.next);
-    if (token == null) {
-      return null;
-    }
-    while (matches4(token, TokenType.COMMA)) {
-      token = skipTypeName(token.next);
-      if (token == null) {
-        return null;
-      }
-    }
-    if (identical(token.type, TokenType.GT)) {
-      return token.next;
-    } else if (identical(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 given token, 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].
-   *
-   * <pre>
-   * type ::=
-   *     qualified typeArguments?
-   * </pre>
-   *
-   * @param startToken the token at which parsing is to begin
-   * @return the token following the type name that was parsed
-   */
-  Token skipTypeName(Token startToken) {
-    Token token = skipPrefixedIdentifier(startToken);
-    if (token == null) {
-      return null;
-    }
-    if (matches4(token, TokenType.LT)) {
-      token = skipTypeArgumentList(token);
-    }
-    return token;
-  }
-
-  /**
-   * Parse a list of type parameters, starting at the given token, 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].
-   *
-   * <pre>
-   * typeParameterList ::=
-   *     '<' typeParameter (',' typeParameter)* '>'
-   * </pre>
-   *
-   * @param startToken the token at which parsing is to begin
-   * @return the token following the type parameter list that was parsed
-   */
-  Token skipTypeParameterList(Token startToken) {
-    if (!matches4(startToken, TokenType.LT)) {
-      return null;
-    }
-    int depth = 1;
-    Token next = startToken.next;
-    while (depth > 0) {
-      if (matches4(next, TokenType.EOF)) {
-        return null;
-      } else if (matches4(next, TokenType.LT)) {
-        depth++;
-      } else if (matches4(next, TokenType.GT)) {
-        depth--;
-      } else if (matches4(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 (matches4(next, TokenType.GT_GT)) {
-        depth -= 2;
-      } else if (matches4(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;
-  }
-
-  /**
-   * Translate the characters at the given index in the given string, appending the translated
-   * character to the given builder. The index is assumed to be valid.
-   *
-   * @param builder the builder to which the translated character is to be appended
-   * @param lexeme the string containing the character(s) to be translated
-   * @param index the index of the character to be translated
-   * @return the index of the next character to be translated
-   */
-  int translateCharacter(JavaStringBuilder builder, String lexeme, int index) {
-    int currentChar = lexeme.codeUnitAt(index);
-    if (currentChar != 0x5C) {
-      builder.appendChar(currentChar);
-      return index + 1;
-    }
-    int length = lexeme.length;
-    int currentIndex = index + 1;
-    if (currentIndex >= length) {
-      return length;
-    }
-    currentChar = lexeme.codeUnitAt(currentIndex);
-    if (currentChar == 0x6E) {
-      builder.appendChar(0xA);
-    } else if (currentChar == 0x72) {
-      builder.appendChar(0xD);
-    } else if (currentChar == 0x66) {
-      builder.appendChar(0xC);
-    } else if (currentChar == 0x62) {
-      builder.appendChar(0x8);
-    } else if (currentChar == 0x74) {
-      builder.appendChar(0x9);
-    } else if (currentChar == 0x76) {
-      builder.appendChar(0xB);
-    } else if (currentChar == 0x78) {
-      if (currentIndex + 2 >= length) {
-        reportError8(ParserErrorCode.INVALID_HEX_ESCAPE, []);
-        return length;
-      }
-      int firstDigit = lexeme.codeUnitAt(currentIndex + 1);
-      int secondDigit = lexeme.codeUnitAt(currentIndex + 2);
-      if (!isHexDigit(firstDigit) || !isHexDigit(secondDigit)) {
-        reportError8(ParserErrorCode.INVALID_HEX_ESCAPE, []);
-      } else {
-        builder.appendChar(((Character.digit(firstDigit, 16) << 4) + Character.digit(secondDigit, 16)) as int);
-      }
-      return currentIndex + 3;
-    } else if (currentChar == 0x75) {
-      currentIndex++;
-      if (currentIndex >= length) {
-        reportError8(ParserErrorCode.INVALID_UNICODE_ESCAPE, []);
-        return length;
-      }
-      currentChar = lexeme.codeUnitAt(currentIndex);
-      if (currentChar == 0x7B) {
-        currentIndex++;
-        if (currentIndex >= length) {
-          reportError8(ParserErrorCode.INVALID_UNICODE_ESCAPE, []);
-          return length;
-        }
-        currentChar = lexeme.codeUnitAt(currentIndex);
-        int digitCount = 0;
-        int value = 0;
-        while (currentChar != 0x7D) {
-          if (!isHexDigit(currentChar)) {
-            reportError8(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) {
-            reportError8(ParserErrorCode.INVALID_UNICODE_ESCAPE, []);
-            return length;
-          }
-          currentChar = lexeme.codeUnitAt(currentIndex);
-        }
-        if (digitCount < 1 || digitCount > 6) {
-          reportError8(ParserErrorCode.INVALID_UNICODE_ESCAPE, []);
-        }
-        appendScalarValue(builder, lexeme.substring(index, currentIndex + 1), value, index, currentIndex);
-        return currentIndex + 1;
-      } else {
-        if (currentIndex + 3 >= length) {
-          reportError8(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)) {
-          reportError8(ParserErrorCode.INVALID_UNICODE_ESCAPE, []);
-        } else {
-          appendScalarValue(builder, 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 {
-      builder.appendChar(currentChar);
-    }
-    return currentIndex + 1;
-  }
-
-  /**
-   * Validate that the given parameter list does not contain any field initializers.
-   *
-   * @param parameterList the parameter list to be validated
-   */
-  void validateFormalParameterList(FormalParameterList parameterList) {
-    for (FormalParameter parameter in parameterList.parameters) {
-      if (parameter is FieldFormalParameter) {
-        reportError(ParserErrorCode.FIELD_INITIALIZER_OUTSIDE_CONSTRUCTOR, ((parameter as FieldFormalParameter)).identifier, []);
-      }
-    }
-  }
-
-  /**
-   * Validate that the given set of modifiers is appropriate for a class and return the 'abstract'
-   * keyword if there is one.
-   *
-   * @param modifiers the modifiers being validated
-   */
-  Token validateModifiersForClass(Modifiers modifiers) {
-    validateModifiersForTopLevelDeclaration(modifiers);
-    if (modifiers.constKeyword != null) {
-      reportError9(ParserErrorCode.CONST_CLASS, modifiers.constKeyword, []);
-    }
-    if (modifiers.externalKeyword != null) {
-      reportError9(ParserErrorCode.EXTERNAL_CLASS, modifiers.externalKeyword, []);
-    }
-    if (modifiers.finalKeyword != null) {
-      reportError9(ParserErrorCode.FINAL_CLASS, modifiers.finalKeyword, []);
-    }
-    if (modifiers.varKeyword != null) {
-      reportError9(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.
-   *
-   * @param modifiers the modifiers being validated
-   * @return the 'const' or 'final' keyword associated with the constructor
-   */
-  Token validateModifiersForConstructor(Modifiers modifiers) {
-    if (modifiers.abstractKeyword != null) {
-      reportError8(ParserErrorCode.ABSTRACT_CLASS_MEMBER, []);
-    }
-    if (modifiers.finalKeyword != null) {
-      reportError9(ParserErrorCode.FINAL_CONSTRUCTOR, modifiers.finalKeyword, []);
-    }
-    if (modifiers.staticKeyword != null) {
-      reportError9(ParserErrorCode.STATIC_CONSTRUCTOR, modifiers.staticKeyword, []);
-    }
-    if (modifiers.varKeyword != null) {
-      reportError9(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) {
-      reportError9(ParserErrorCode.EXTERNAL_AFTER_CONST, externalKeyword, []);
-    }
-    if (externalKeyword != null && factoryKeyword != null && factoryKeyword.offset < externalKeyword.offset) {
-      reportError9(ParserErrorCode.EXTERNAL_AFTER_FACTORY, externalKeyword, []);
-    }
-    return constKeyword;
-  }
-
-  /**
-   * Validate that the given set of modifiers is appropriate for a field and return the 'final',
-   * 'const' or 'var' keyword if there is one.
-   *
-   * @param modifiers the modifiers being validated
-   * @return the 'final', 'const' or 'var' keyword associated with the field
-   */
-  Token validateModifiersForField(Modifiers modifiers) {
-    if (modifiers.abstractKeyword != null) {
-      reportError8(ParserErrorCode.ABSTRACT_CLASS_MEMBER, []);
-    }
-    if (modifiers.externalKeyword != null) {
-      reportError9(ParserErrorCode.EXTERNAL_FIELD, modifiers.externalKeyword, []);
-    }
-    if (modifiers.factoryKeyword != null) {
-      reportError9(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) {
-        reportError9(ParserErrorCode.CONST_AND_FINAL, finalKeyword, []);
-      }
-      if (varKeyword != null) {
-        reportError9(ParserErrorCode.CONST_AND_VAR, varKeyword, []);
-      }
-      if (staticKeyword != null && constKeyword.offset < staticKeyword.offset) {
-        reportError9(ParserErrorCode.STATIC_AFTER_CONST, staticKeyword, []);
-      }
-    } else if (finalKeyword != null) {
-      if (varKeyword != null) {
-        reportError9(ParserErrorCode.FINAL_AND_VAR, varKeyword, []);
-      }
-      if (staticKeyword != null && finalKeyword.offset < staticKeyword.offset) {
-        reportError9(ParserErrorCode.STATIC_AFTER_FINAL, staticKeyword, []);
-      }
-    } else if (varKeyword != null && staticKeyword != null && varKeyword.offset < staticKeyword.offset) {
-      reportError9(ParserErrorCode.STATIC_AFTER_VAR, staticKeyword, []);
-    }
-    return lexicallyFirst([constKeyword, finalKeyword, varKeyword]);
-  }
-
-  /**
-   * Validate that the given set of modifiers is appropriate for a local function.
-   *
-   * @param modifiers the modifiers being validated
-   */
-  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) {
-      reportError8(ParserErrorCode.LOCAL_FUNCTION_DECLARATION_MODIFIER, []);
-    }
-  }
-
-  /**
-   * Validate that the given set of modifiers is appropriate for a getter, setter, or method.
-   *
-   * @param modifiers the modifiers being validated
-   */
-  void validateModifiersForGetterOrSetterOrMethod(Modifiers modifiers) {
-    if (modifiers.abstractKeyword != null) {
-      reportError8(ParserErrorCode.ABSTRACT_CLASS_MEMBER, []);
-    }
-    if (modifiers.constKeyword != null) {
-      reportError9(ParserErrorCode.CONST_METHOD, modifiers.constKeyword, []);
-    }
-    if (modifiers.factoryKeyword != null) {
-      reportError9(ParserErrorCode.NON_CONSTRUCTOR_FACTORY, modifiers.factoryKeyword, []);
-    }
-    if (modifiers.finalKeyword != null) {
-      reportError9(ParserErrorCode.FINAL_METHOD, modifiers.finalKeyword, []);
-    }
-    if (modifiers.varKeyword != null) {
-      reportError9(ParserErrorCode.VAR_RETURN_TYPE, modifiers.varKeyword, []);
-    }
-    Token externalKeyword = modifiers.externalKeyword;
-    Token staticKeyword = modifiers.staticKeyword;
-    if (externalKeyword != null && staticKeyword != null && staticKeyword.offset < externalKeyword.offset) {
-      reportError9(ParserErrorCode.EXTERNAL_AFTER_STATIC, externalKeyword, []);
-    }
-  }
-
-  /**
-   * Validate that the given set of modifiers is appropriate for a getter, setter, or method.
-   *
-   * @param modifiers the modifiers being validated
-   */
-  void validateModifiersForOperator(Modifiers modifiers) {
-    if (modifiers.abstractKeyword != null) {
-      reportError8(ParserErrorCode.ABSTRACT_CLASS_MEMBER, []);
-    }
-    if (modifiers.constKeyword != null) {
-      reportError9(ParserErrorCode.CONST_METHOD, modifiers.constKeyword, []);
-    }
-    if (modifiers.factoryKeyword != null) {
-      reportError9(ParserErrorCode.NON_CONSTRUCTOR_FACTORY, modifiers.factoryKeyword, []);
-    }
-    if (modifiers.finalKeyword != null) {
-      reportError9(ParserErrorCode.FINAL_METHOD, modifiers.finalKeyword, []);
-    }
-    if (modifiers.staticKeyword != null) {
-      reportError9(ParserErrorCode.STATIC_OPERATOR, modifiers.staticKeyword, []);
-    }
-    if (modifiers.varKeyword != null) {
-      reportError9(ParserErrorCode.VAR_RETURN_TYPE, modifiers.varKeyword, []);
-    }
-  }
-
-  /**
-   * Validate that the given set of modifiers is appropriate for a top-level declaration.
-   *
-   * @param modifiers the modifiers being validated
-   */
-  void validateModifiersForTopLevelDeclaration(Modifiers modifiers) {
-    if (modifiers.factoryKeyword != null) {
-      reportError9(ParserErrorCode.FACTORY_TOP_LEVEL_DECLARATION, modifiers.factoryKeyword, []);
-    }
-    if (modifiers.staticKeyword != null) {
-      reportError9(ParserErrorCode.STATIC_TOP_LEVEL_DECLARATION, modifiers.staticKeyword, []);
-    }
-  }
-
-  /**
-   * Validate that the given set of modifiers is appropriate for a top-level function.
-   *
-   * @param modifiers the modifiers being validated
-   */
-  void validateModifiersForTopLevelFunction(Modifiers modifiers) {
-    validateModifiersForTopLevelDeclaration(modifiers);
-    if (modifiers.abstractKeyword != null) {
-      reportError8(ParserErrorCode.ABSTRACT_TOP_LEVEL_FUNCTION, []);
-    }
-    if (modifiers.constKeyword != null) {
-      reportError9(ParserErrorCode.CONST_CLASS, modifiers.constKeyword, []);
-    }
-    if (modifiers.finalKeyword != null) {
-      reportError9(ParserErrorCode.FINAL_CLASS, modifiers.finalKeyword, []);
-    }
-    if (modifiers.varKeyword != null) {
-      reportError9(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.
-   *
-   * @param modifiers the modifiers being validated
-   * @return the 'final', 'const' or 'var' keyword associated with the field
-   */
-  Token validateModifiersForTopLevelVariable(Modifiers modifiers) {
-    validateModifiersForTopLevelDeclaration(modifiers);
-    if (modifiers.abstractKeyword != null) {
-      reportError8(ParserErrorCode.ABSTRACT_TOP_LEVEL_VARIABLE, []);
-    }
-    if (modifiers.externalKeyword != null) {
-      reportError9(ParserErrorCode.EXTERNAL_FIELD, modifiers.externalKeyword, []);
-    }
-    Token constKeyword = modifiers.constKeyword;
-    Token finalKeyword = modifiers.finalKeyword;
-    Token varKeyword = modifiers.varKeyword;
-    if (constKeyword != null) {
-      if (finalKeyword != null) {
-        reportError9(ParserErrorCode.CONST_AND_FINAL, finalKeyword, []);
-      }
-      if (varKeyword != null) {
-        reportError9(ParserErrorCode.CONST_AND_VAR, varKeyword, []);
-      }
-    } else if (finalKeyword != null) {
-      if (varKeyword != null) {
-        reportError9(ParserErrorCode.FINAL_AND_VAR, varKeyword, []);
-      }
-    }
-    return 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.
-   *
-   * @param modifiers the modifiers being validated
-   */
-  void validateModifiersForTypedef(Modifiers modifiers) {
-    validateModifiersForTopLevelDeclaration(modifiers);
-    if (modifiers.abstractKeyword != null) {
-      reportError9(ParserErrorCode.ABSTRACT_TYPEDEF, modifiers.abstractKeyword, []);
-    }
-    if (modifiers.constKeyword != null) {
-      reportError9(ParserErrorCode.CONST_TYPEDEF, modifiers.constKeyword, []);
-    }
-    if (modifiers.externalKeyword != null) {
-      reportError9(ParserErrorCode.EXTERNAL_TYPEDEF, modifiers.externalKeyword, []);
-    }
-    if (modifiers.finalKeyword != null) {
-      reportError9(ParserErrorCode.FINAL_TYPEDEF, modifiers.finalKeyword, []);
-    }
-    if (modifiers.varKeyword != null) {
-      reportError9(ParserErrorCode.VAR_TYPEDEF, modifiers.varKeyword, []);
-    }
-  }
-}
-/**
- * Instances of the class `SyntheticKeywordToken` implement a synthetic keyword token.
- */
-class Parser_SyntheticKeywordToken extends KeywordToken {
-
-  /**
-   * Initialize a newly created token to represent the given keyword.
-   *
-   * @param keyword the keyword being represented by this token
-   * @param offset the offset from the beginning of the file to the first character in the token
-   */
-  Parser_SyntheticKeywordToken(Keyword keyword, int offset) : super(keyword, offset);
-  Token copy() => new Parser_SyntheticKeywordToken(keyword, offset);
-  int get length => 0;
-}
-class AnalysisErrorListener_15 implements AnalysisErrorListener {
-  List<bool> errorFound;
-  AnalysisErrorListener_15(this.errorFound);
-  void onError(AnalysisError error) {
-    errorFound[0] = true;
-  }
-}
-/**
- * The enumeration `ParserErrorCode` defines 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.
- *
- * @coverage dart.engine.parser
- */
-class ParserErrorCode extends Enum<ParserErrorCode> implements ErrorCode {
-  static final ParserErrorCode ABSTRACT_CLASS_MEMBER = new ParserErrorCode.con3('ABSTRACT_CLASS_MEMBER', 0, "Members of classes cannot be declared to be 'abstract'");
-  static final ParserErrorCode ABSTRACT_STATIC_METHOD = new ParserErrorCode.con3('ABSTRACT_STATIC_METHOD', 1, "Static methods cannot be declared to be 'abstract'");
-  static final ParserErrorCode ABSTRACT_TOP_LEVEL_FUNCTION = new ParserErrorCode.con3('ABSTRACT_TOP_LEVEL_FUNCTION', 2, "Top-level functions cannot be declared to be 'abstract'");
-  static final ParserErrorCode ABSTRACT_TOP_LEVEL_VARIABLE = new ParserErrorCode.con3('ABSTRACT_TOP_LEVEL_VARIABLE', 3, "Top-level variables cannot be declared to be 'abstract'");
-  static final ParserErrorCode ABSTRACT_TYPEDEF = new ParserErrorCode.con3('ABSTRACT_TYPEDEF', 4, "Type aliases cannot be declared to be 'abstract'");
-  static final ParserErrorCode ASSERT_DOES_NOT_TAKE_ASSIGNMENT = new ParserErrorCode.con3('ASSERT_DOES_NOT_TAKE_ASSIGNMENT', 5, "Assert cannot be called on an assignment");
-  static final ParserErrorCode ASSERT_DOES_NOT_TAKE_CASCADE = new ParserErrorCode.con3('ASSERT_DOES_NOT_TAKE_CASCADE', 6, "Assert cannot be called on cascade");
-  static final ParserErrorCode ASSERT_DOES_NOT_TAKE_THROW = new ParserErrorCode.con3('ASSERT_DOES_NOT_TAKE_THROW', 7, "Assert cannot be called on throws");
-  static final ParserErrorCode ASSERT_DOES_NOT_TAKE_RETHROW = new ParserErrorCode.con3('ASSERT_DOES_NOT_TAKE_RETHROW', 8, "Assert cannot be called on rethrows");
-  static final ParserErrorCode BREAK_OUTSIDE_OF_LOOP = new ParserErrorCode.con3('BREAK_OUTSIDE_OF_LOOP', 9, "A break statement cannot be used outside of a loop or switch statement");
-  static final ParserErrorCode CONST_AND_FINAL = new ParserErrorCode.con3('CONST_AND_FINAL', 10, "Members cannot be declared to be both 'const' and 'final'");
-  static final ParserErrorCode CONST_AND_VAR = new ParserErrorCode.con3('CONST_AND_VAR', 11, "Members cannot be declared to be both 'const' and 'var'");
-  static final ParserErrorCode CONST_CLASS = new ParserErrorCode.con3('CONST_CLASS', 12, "Classes cannot be declared to be 'const'");
-  static final ParserErrorCode CONST_CONSTRUCTOR_WITH_BODY = new ParserErrorCode.con3('CONST_CONSTRUCTOR_WITH_BODY', 13, "'const' constructors cannot have a body");
-  static final ParserErrorCode CONST_FACTORY = new ParserErrorCode.con3('CONST_FACTORY', 14, "Only redirecting factory constructors can be declared to be 'const'");
-  static final ParserErrorCode CONST_METHOD = new ParserErrorCode.con3('CONST_METHOD', 15, "Getters, setters and methods cannot be declared to be 'const'");
-  static final ParserErrorCode CONST_TYPEDEF = new ParserErrorCode.con3('CONST_TYPEDEF', 16, "Type aliases cannot be declared to be 'const'");
-  static final ParserErrorCode CONSTRUCTOR_WITH_RETURN_TYPE = new ParserErrorCode.con3('CONSTRUCTOR_WITH_RETURN_TYPE', 17, "Constructors cannot have a return type");
-  static final ParserErrorCode CONTINUE_OUTSIDE_OF_LOOP = new ParserErrorCode.con3('CONTINUE_OUTSIDE_OF_LOOP', 18, "A continue statement cannot be used outside of a loop or switch statement");
-  static final ParserErrorCode CONTINUE_WITHOUT_LABEL_IN_CASE = new ParserErrorCode.con3('CONTINUE_WITHOUT_LABEL_IN_CASE', 19, "A continue statement in a switch statement must have a label as a target");
-  static final ParserErrorCode DEPRECATED_ARGUMENT_DEFINITION_TEST = new ParserErrorCode.con3('DEPRECATED_ARGUMENT_DEFINITION_TEST', 20, "The argument definition test ('?' operator) has been deprecated");
-  static final ParserErrorCode DEPRECATED_CLASS_TYPE_ALIAS = new ParserErrorCode.con3('DEPRECATED_CLASS_TYPE_ALIAS', 21, "The 'typedef' mixin application was replaced with 'class'");
-  static final ParserErrorCode DIRECTIVE_AFTER_DECLARATION = new ParserErrorCode.con3('DIRECTIVE_AFTER_DECLARATION', 22, "Directives must appear before any declarations");
-  static final ParserErrorCode DUPLICATE_LABEL_IN_SWITCH_STATEMENT = new ParserErrorCode.con3('DUPLICATE_LABEL_IN_SWITCH_STATEMENT', 23, "The label %s was already used in this switch statement");
-  static final ParserErrorCode DUPLICATED_MODIFIER = new ParserErrorCode.con3('DUPLICATED_MODIFIER', 24, "The modifier '%s' was already specified.");
-  static final ParserErrorCode EQUALITY_CANNOT_BE_EQUALITY_OPERAND = new ParserErrorCode.con3('EQUALITY_CANNOT_BE_EQUALITY_OPERAND', 25, "Equality expression cannot be operand of another equality expression.");
-  static final ParserErrorCode EXPECTED_CASE_OR_DEFAULT = new ParserErrorCode.con3('EXPECTED_CASE_OR_DEFAULT', 26, "Expected 'case' or 'default'");
-  static final ParserErrorCode EXPECTED_CLASS_MEMBER = new ParserErrorCode.con3('EXPECTED_CLASS_MEMBER', 27, "Expected a class member");
-  static final ParserErrorCode EXPECTED_EXECUTABLE = new ParserErrorCode.con3('EXPECTED_EXECUTABLE', 28, "Expected a method, getter, setter or operator declaration");
-  static final ParserErrorCode EXPECTED_LIST_OR_MAP_LITERAL = new ParserErrorCode.con3('EXPECTED_LIST_OR_MAP_LITERAL', 29, "Expected a list or map literal");
-  static final ParserErrorCode EXPECTED_STRING_LITERAL = new ParserErrorCode.con3('EXPECTED_STRING_LITERAL', 30, "Expected a string literal");
-  static final ParserErrorCode EXPECTED_TOKEN = new ParserErrorCode.con3('EXPECTED_TOKEN', 31, "Expected to find '%s'");
-  static final ParserErrorCode EXPECTED_TYPE_NAME = new ParserErrorCode.con3('EXPECTED_TYPE_NAME', 32, "Expected a type name");
-  static final ParserErrorCode EXPORT_DIRECTIVE_AFTER_PART_DIRECTIVE = new ParserErrorCode.con3('EXPORT_DIRECTIVE_AFTER_PART_DIRECTIVE', 33, "Export directives must preceed part directives");
-  static final ParserErrorCode EXTERNAL_AFTER_CONST = new ParserErrorCode.con3('EXTERNAL_AFTER_CONST', 34, "The modifier 'external' should be before the modifier 'const'");
-  static final ParserErrorCode EXTERNAL_AFTER_FACTORY = new ParserErrorCode.con3('EXTERNAL_AFTER_FACTORY', 35, "The modifier 'external' should be before the modifier 'factory'");
-  static final ParserErrorCode EXTERNAL_AFTER_STATIC = new ParserErrorCode.con3('EXTERNAL_AFTER_STATIC', 36, "The modifier 'external' should be before the modifier 'static'");
-  static final ParserErrorCode EXTERNAL_CLASS = new ParserErrorCode.con3('EXTERNAL_CLASS', 37, "Classes cannot be declared to be 'external'");
-  static final ParserErrorCode EXTERNAL_CONSTRUCTOR_WITH_BODY = new ParserErrorCode.con3('EXTERNAL_CONSTRUCTOR_WITH_BODY', 38, "External constructors cannot have a body");
-  static final ParserErrorCode EXTERNAL_FIELD = new ParserErrorCode.con3('EXTERNAL_FIELD', 39, "Fields cannot be declared to be 'external'");
-  static final ParserErrorCode EXTERNAL_GETTER_WITH_BODY = new ParserErrorCode.con3('EXTERNAL_GETTER_WITH_BODY', 40, "External getters cannot have a body");
-  static final ParserErrorCode EXTERNAL_METHOD_WITH_BODY = new ParserErrorCode.con3('EXTERNAL_METHOD_WITH_BODY', 41, "External methods cannot have a body");
-  static final ParserErrorCode EXTERNAL_OPERATOR_WITH_BODY = new ParserErrorCode.con3('EXTERNAL_OPERATOR_WITH_BODY', 42, "External operators cannot have a body");
-  static final ParserErrorCode EXTERNAL_SETTER_WITH_BODY = new ParserErrorCode.con3('EXTERNAL_SETTER_WITH_BODY', 43, "External setters cannot have a body");
-  static final ParserErrorCode EXTERNAL_TYPEDEF = new ParserErrorCode.con3('EXTERNAL_TYPEDEF', 44, "Type aliases cannot be declared to be 'external'");
-  static final ParserErrorCode FACTORY_TOP_LEVEL_DECLARATION = new ParserErrorCode.con3('FACTORY_TOP_LEVEL_DECLARATION', 45, "Top-level declarations cannot be declared to be 'factory'");
-  static final ParserErrorCode FACTORY_WITHOUT_BODY = new ParserErrorCode.con3('FACTORY_WITHOUT_BODY', 46, "A non-redirecting 'factory' constructor must have a body");
-  static final ParserErrorCode FIELD_INITIALIZER_OUTSIDE_CONSTRUCTOR = new ParserErrorCode.con3('FIELD_INITIALIZER_OUTSIDE_CONSTRUCTOR', 47, "Field initializers can only be used in a constructor");
-  static final ParserErrorCode FINAL_AND_VAR = new ParserErrorCode.con3('FINAL_AND_VAR', 48, "Members cannot be declared to be both 'final' and 'var'");
-  static final ParserErrorCode FINAL_CLASS = new ParserErrorCode.con3('FINAL_CLASS', 49, "Classes cannot be declared to be 'final'");
-  static final ParserErrorCode FINAL_CONSTRUCTOR = new ParserErrorCode.con3('FINAL_CONSTRUCTOR', 50, "A constructor cannot be declared to be 'final'");
-  static final ParserErrorCode FINAL_METHOD = new ParserErrorCode.con3('FINAL_METHOD', 51, "Getters, setters and methods cannot be declared to be 'final'");
-  static final ParserErrorCode FINAL_TYPEDEF = new ParserErrorCode.con3('FINAL_TYPEDEF', 52, "Type aliases cannot be declared to be 'final'");
-  static final ParserErrorCode FUNCTION_TYPED_PARAMETER_VAR = new ParserErrorCode.con3('FUNCTION_TYPED_PARAMETER_VAR', 53, "Function typed parameters cannot specify 'const', 'final' or 'var' instead of return type");
-  static final ParserErrorCode GETTER_IN_FUNCTION = new ParserErrorCode.con3('GETTER_IN_FUNCTION', 54, "Getters cannot be defined within methods or functions");
-  static final ParserErrorCode GETTER_WITH_PARAMETERS = new ParserErrorCode.con3('GETTER_WITH_PARAMETERS', 55, "Getter should be declared without a parameter list");
-  static final ParserErrorCode ILLEGAL_ASSIGNMENT_TO_NON_ASSIGNABLE = new ParserErrorCode.con3('ILLEGAL_ASSIGNMENT_TO_NON_ASSIGNABLE', 56, "Illegal assignment to non-assignable expression");
-  static final ParserErrorCode IMPLEMENTS_BEFORE_EXTENDS = new ParserErrorCode.con3('IMPLEMENTS_BEFORE_EXTENDS', 57, "The extends clause must be before the implements clause");
-  static final ParserErrorCode IMPLEMENTS_BEFORE_WITH = new ParserErrorCode.con3('IMPLEMENTS_BEFORE_WITH', 58, "The with clause must be before the implements clause");
-  static final ParserErrorCode IMPORT_DIRECTIVE_AFTER_PART_DIRECTIVE = new ParserErrorCode.con3('IMPORT_DIRECTIVE_AFTER_PART_DIRECTIVE', 59, "Import directives must preceed part directives");
-  static final ParserErrorCode INITIALIZED_VARIABLE_IN_FOR_EACH = new ParserErrorCode.con3('INITIALIZED_VARIABLE_IN_FOR_EACH', 60, "The loop variable in a for-each loop cannot be initialized");
-  static final ParserErrorCode INVALID_CODE_POINT = new ParserErrorCode.con3('INVALID_CODE_POINT', 61, "The escape sequence '%s' is not a valid code point");
-  static final ParserErrorCode INVALID_COMMENT_REFERENCE = new ParserErrorCode.con3('INVALID_COMMENT_REFERENCE', 62, "Comment references should contain a possibly prefixed identifier and can start with 'new', but should not contain anything else");
-  static final ParserErrorCode INVALID_HEX_ESCAPE = new ParserErrorCode.con3('INVALID_HEX_ESCAPE', 63, "An escape sequence starting with '\\x' must be followed by 2 hexidecimal digits");
-  static final ParserErrorCode INVALID_OPERATOR = new ParserErrorCode.con3('INVALID_OPERATOR', 64, "The string '%s' is not a valid operator");
-  static final ParserErrorCode INVALID_OPERATOR_FOR_SUPER = new ParserErrorCode.con3('INVALID_OPERATOR_FOR_SUPER', 65, "The operator '%s' cannot be used with 'super'");
-  static final ParserErrorCode INVALID_UNICODE_ESCAPE = new ParserErrorCode.con3('INVALID_UNICODE_ESCAPE', 66, "An escape sequence starting with '\\u' must be followed by 4 hexidecimal digits or from 1 to 6 digits between '{' and '}'");
-  static final ParserErrorCode LIBRARY_DIRECTIVE_NOT_FIRST = new ParserErrorCode.con3('LIBRARY_DIRECTIVE_NOT_FIRST', 67, "The library directive must appear before all other directives");
-  static final ParserErrorCode LOCAL_FUNCTION_DECLARATION_MODIFIER = new ParserErrorCode.con3('LOCAL_FUNCTION_DECLARATION_MODIFIER', 68, "Local function declarations cannot specify any modifier");
-  static final ParserErrorCode MISSING_ASSIGNABLE_SELECTOR = new ParserErrorCode.con3('MISSING_ASSIGNABLE_SELECTOR', 69, "Missing selector such as \".<identifier>\" or \"[0]\"");
-  static final ParserErrorCode MISSING_CATCH_OR_FINALLY = new ParserErrorCode.con3('MISSING_CATCH_OR_FINALLY', 70, "A try statement must have either a catch or finally clause");
-  static final ParserErrorCode MISSING_CLASS_BODY = new ParserErrorCode.con3('MISSING_CLASS_BODY', 71, "A class definition must have a body, even if it is empty");
-  static final ParserErrorCode MISSING_CLOSING_PARENTHESIS = new ParserErrorCode.con3('MISSING_CLOSING_PARENTHESIS', 72, "The closing parenthesis is missing");
-  static final ParserErrorCode MISSING_CONST_FINAL_VAR_OR_TYPE = new ParserErrorCode.con3('MISSING_CONST_FINAL_VAR_OR_TYPE', 73, "Variables must be declared using the keywords 'const', 'final', 'var' or a type name");
-  static final ParserErrorCode MISSING_EXPRESSION_IN_THROW = new ParserErrorCode.con3('MISSING_EXPRESSION_IN_THROW', 74, "Throw expressions must compute the object to be thrown");
-  static final ParserErrorCode MISSING_FUNCTION_BODY = new ParserErrorCode.con3('MISSING_FUNCTION_BODY', 75, "A function body must be provided");
-  static final ParserErrorCode MISSING_FUNCTION_PARAMETERS = new ParserErrorCode.con3('MISSING_FUNCTION_PARAMETERS', 76, "Functions must have an explicit list of parameters");
-  static final ParserErrorCode MISSING_IDENTIFIER = new ParserErrorCode.con3('MISSING_IDENTIFIER', 77, "Expected an identifier");
-  static final ParserErrorCode MISSING_KEYWORD_OPERATOR = new ParserErrorCode.con3('MISSING_KEYWORD_OPERATOR', 78, "Operator declarations must be preceeded by the keyword 'operator'");
-  static final ParserErrorCode MISSING_NAME_IN_LIBRARY_DIRECTIVE = new ParserErrorCode.con3('MISSING_NAME_IN_LIBRARY_DIRECTIVE', 79, "Library directives must include a library name");
-  static final ParserErrorCode MISSING_NAME_IN_PART_OF_DIRECTIVE = new ParserErrorCode.con3('MISSING_NAME_IN_PART_OF_DIRECTIVE', 80, "Library directives must include a library name");
-  static final ParserErrorCode MISSING_STATEMENT = new ParserErrorCode.con3('MISSING_STATEMENT', 81, "Expected a statement");
-  static final ParserErrorCode MISSING_TERMINATOR_FOR_PARAMETER_GROUP = new ParserErrorCode.con3('MISSING_TERMINATOR_FOR_PARAMETER_GROUP', 82, "There is no '%s' to close the parameter group");
-  static final ParserErrorCode MISSING_TYPEDEF_PARAMETERS = new ParserErrorCode.con3('MISSING_TYPEDEF_PARAMETERS', 83, "Type aliases for functions must have an explicit list of parameters");
-  static final ParserErrorCode MISSING_VARIABLE_IN_FOR_EACH = new ParserErrorCode.con3('MISSING_VARIABLE_IN_FOR_EACH', 84, "A loop variable must be declared in a for-each loop before the 'in', but none were found");
-  static final ParserErrorCode MIXED_PARAMETER_GROUPS = new ParserErrorCode.con3('MIXED_PARAMETER_GROUPS', 85, "Cannot have both positional and named parameters in a single parameter list");
-  static final ParserErrorCode MULTIPLE_EXTENDS_CLAUSES = new ParserErrorCode.con3('MULTIPLE_EXTENDS_CLAUSES', 86, "Each class definition can have at most one extends clause");
-  static final ParserErrorCode MULTIPLE_IMPLEMENTS_CLAUSES = new ParserErrorCode.con3('MULTIPLE_IMPLEMENTS_CLAUSES', 87, "Each class definition can have at most one implements clause");
-  static final ParserErrorCode MULTIPLE_LIBRARY_DIRECTIVES = new ParserErrorCode.con3('MULTIPLE_LIBRARY_DIRECTIVES', 88, "Only one library directive may be declared in a file");
-  static final ParserErrorCode MULTIPLE_NAMED_PARAMETER_GROUPS = new ParserErrorCode.con3('MULTIPLE_NAMED_PARAMETER_GROUPS', 89, "Cannot have multiple groups of named parameters in a single parameter list");
-  static final ParserErrorCode MULTIPLE_PART_OF_DIRECTIVES = new ParserErrorCode.con3('MULTIPLE_PART_OF_DIRECTIVES', 90, "Only one part-of directive may be declared in a file");
-  static final ParserErrorCode MULTIPLE_POSITIONAL_PARAMETER_GROUPS = new ParserErrorCode.con3('MULTIPLE_POSITIONAL_PARAMETER_GROUPS', 91, "Cannot have multiple groups of positional parameters in a single parameter list");
-  static final ParserErrorCode MULTIPLE_VARIABLES_IN_FOR_EACH = new ParserErrorCode.con3('MULTIPLE_VARIABLES_IN_FOR_EACH', 92, "A single loop variable must be declared in a for-each loop before the 'in', but %s were found");
-  static final ParserErrorCode MULTIPLE_WITH_CLAUSES = new ParserErrorCode.con3('MULTIPLE_WITH_CLAUSES', 93, "Each class definition can have at most one with clause");
-  static final ParserErrorCode NAMED_FUNCTION_EXPRESSION = new ParserErrorCode.con3('NAMED_FUNCTION_EXPRESSION', 94, "Function expressions cannot be named");
-  static final ParserErrorCode NAMED_PARAMETER_OUTSIDE_GROUP = new ParserErrorCode.con3('NAMED_PARAMETER_OUTSIDE_GROUP', 95, "Named parameters must be enclosed in curly braces ('{' and '}')");
-  static final ParserErrorCode NATIVE_CLAUSE_IN_NON_SDK_CODE = new ParserErrorCode.con3('NATIVE_CLAUSE_IN_NON_SDK_CODE', 96, "Native clause can only be used in the SDK and code that is loaded through native extensions");
-  static final ParserErrorCode NATIVE_FUNCTION_BODY_IN_NON_SDK_CODE = new ParserErrorCode.con3('NATIVE_FUNCTION_BODY_IN_NON_SDK_CODE', 97, "Native functions can only be declared in the SDK and code that is loaded through native extensions");
-  static final ParserErrorCode NON_CONSTRUCTOR_FACTORY = new ParserErrorCode.con3('NON_CONSTRUCTOR_FACTORY', 98, "Only constructors can be declared to be a 'factory'");
-  static final ParserErrorCode NON_IDENTIFIER_LIBRARY_NAME = new ParserErrorCode.con3('NON_IDENTIFIER_LIBRARY_NAME', 99, "The name of a library must be an identifier");
-  static final ParserErrorCode NON_PART_OF_DIRECTIVE_IN_PART = new ParserErrorCode.con3('NON_PART_OF_DIRECTIVE_IN_PART', 100, "The part-of directive must be the only directive in a part");
-  static final ParserErrorCode NON_USER_DEFINABLE_OPERATOR = new ParserErrorCode.con3('NON_USER_DEFINABLE_OPERATOR', 101, "The operator '%s' is not user definable");
-  static final ParserErrorCode NORMAL_BEFORE_OPTIONAL_PARAMETERS = new ParserErrorCode.con3('NORMAL_BEFORE_OPTIONAL_PARAMETERS', 102, "Normal parameters must occur before optional parameters");
-  static final ParserErrorCode POSITIONAL_AFTER_NAMED_ARGUMENT = new ParserErrorCode.con3('POSITIONAL_AFTER_NAMED_ARGUMENT', 103, "Positional arguments must occur before named arguments");
-  static final ParserErrorCode POSITIONAL_PARAMETER_OUTSIDE_GROUP = new ParserErrorCode.con3('POSITIONAL_PARAMETER_OUTSIDE_GROUP', 104, "Positional parameters must be enclosed in square brackets ('[' and ']')");
-  static final ParserErrorCode REDIRECTION_IN_NON_FACTORY_CONSTRUCTOR = new ParserErrorCode.con3('REDIRECTION_IN_NON_FACTORY_CONSTRUCTOR', 105, "Only factory constructor can specify '=' redirection.");
-  static final ParserErrorCode SETTER_IN_FUNCTION = new ParserErrorCode.con3('SETTER_IN_FUNCTION', 106, "Setters cannot be defined within methods or functions");
-  static final ParserErrorCode STATIC_AFTER_CONST = new ParserErrorCode.con3('STATIC_AFTER_CONST', 107, "The modifier 'static' should be before the modifier 'const'");
-  static final ParserErrorCode STATIC_AFTER_FINAL = new ParserErrorCode.con3('STATIC_AFTER_FINAL', 108, "The modifier 'static' should be before the modifier 'final'");
-  static final ParserErrorCode STATIC_AFTER_VAR = new ParserErrorCode.con3('STATIC_AFTER_VAR', 109, "The modifier 'static' should be before the modifier 'var'");
-  static final ParserErrorCode STATIC_CONSTRUCTOR = new ParserErrorCode.con3('STATIC_CONSTRUCTOR', 110, "Constructors cannot be static");
-  static final ParserErrorCode STATIC_GETTER_WITHOUT_BODY = new ParserErrorCode.con3('STATIC_GETTER_WITHOUT_BODY', 111, "A 'static' getter must have a body");
-  static final ParserErrorCode STATIC_OPERATOR = new ParserErrorCode.con3('STATIC_OPERATOR', 112, "Operators cannot be static");
-  static final ParserErrorCode STATIC_SETTER_WITHOUT_BODY = new ParserErrorCode.con3('STATIC_SETTER_WITHOUT_BODY', 113, "A 'static' setter must have a body");
-  static final ParserErrorCode STATIC_TOP_LEVEL_DECLARATION = new ParserErrorCode.con3('STATIC_TOP_LEVEL_DECLARATION', 114, "Top-level declarations cannot be declared to be 'static'");
-  static final ParserErrorCode SWITCH_HAS_CASE_AFTER_DEFAULT_CASE = new ParserErrorCode.con3('SWITCH_HAS_CASE_AFTER_DEFAULT_CASE', 115, "The 'default' case should be the last case in a switch statement");
-  static final ParserErrorCode SWITCH_HAS_MULTIPLE_DEFAULT_CASES = new ParserErrorCode.con3('SWITCH_HAS_MULTIPLE_DEFAULT_CASES', 116, "The 'default' case can only be declared once");
-  static final ParserErrorCode TOP_LEVEL_OPERATOR = new ParserErrorCode.con3('TOP_LEVEL_OPERATOR', 117, "Operators must be declared within a class");
-  static final ParserErrorCode UNEXPECTED_TERMINATOR_FOR_PARAMETER_GROUP = new ParserErrorCode.con3('UNEXPECTED_TERMINATOR_FOR_PARAMETER_GROUP', 118, "There is no '%s' to open a parameter group");
-  static final ParserErrorCode UNEXPECTED_TOKEN = new ParserErrorCode.con3('UNEXPECTED_TOKEN', 119, "Unexpected token '%s'");
-  static final ParserErrorCode WITH_BEFORE_EXTENDS = new ParserErrorCode.con3('WITH_BEFORE_EXTENDS', 120, "The extends clause must be before the with clause");
-  static final ParserErrorCode WITH_WITHOUT_EXTENDS = new ParserErrorCode.con3('WITH_WITHOUT_EXTENDS', 121, "The with clause cannot be used without an extends clause");
-  static final ParserErrorCode WRONG_SEPARATOR_FOR_NAMED_PARAMETER = new ParserErrorCode.con3('WRONG_SEPARATOR_FOR_NAMED_PARAMETER', 122, "The default value of a named parameter should be preceeded by ':'");
-  static final ParserErrorCode WRONG_SEPARATOR_FOR_POSITIONAL_PARAMETER = new ParserErrorCode.con3('WRONG_SEPARATOR_FOR_POSITIONAL_PARAMETER', 123, "The default value of a positional parameter should be preceeded by '='");
-  static final ParserErrorCode WRONG_TERMINATOR_FOR_PARAMETER_GROUP = new ParserErrorCode.con3('WRONG_TERMINATOR_FOR_PARAMETER_GROUP', 124, "Expected '%s' to close parameter group");
-  static final ParserErrorCode VAR_AND_TYPE = new ParserErrorCode.con3('VAR_AND_TYPE', 125, "Variables cannot be declared using both 'var' and a type name; remove the 'var'");
-  static final ParserErrorCode VAR_AS_TYPE_NAME = new ParserErrorCode.con3('VAR_AS_TYPE_NAME', 126, "The keyword 'var' cannot be used as a type name");
-  static final ParserErrorCode VAR_CLASS = new ParserErrorCode.con3('VAR_CLASS', 127, "Classes cannot be declared to be 'var'");
-  static final ParserErrorCode VAR_RETURN_TYPE = new ParserErrorCode.con3('VAR_RETURN_TYPE', 128, "The return type cannot be 'var'");
-  static final ParserErrorCode VAR_TYPEDEF = new ParserErrorCode.con3('VAR_TYPEDEF', 129, "Type aliases cannot be declared to be 'var'");
-  static final ParserErrorCode VOID_PARAMETER = new ParserErrorCode.con3('VOID_PARAMETER', 130, "Parameters cannot have a type of 'void'");
-  static final ParserErrorCode VOID_VARIABLE = new ParserErrorCode.con3('VOID_VARIABLE', 131, "Variables cannot have a type of 'void'");
-  static final List<ParserErrorCode> values = [
-      ABSTRACT_CLASS_MEMBER,
-      ABSTRACT_STATIC_METHOD,
-      ABSTRACT_TOP_LEVEL_FUNCTION,
-      ABSTRACT_TOP_LEVEL_VARIABLE,
-      ABSTRACT_TYPEDEF,
-      ASSERT_DOES_NOT_TAKE_ASSIGNMENT,
-      ASSERT_DOES_NOT_TAKE_CASCADE,
-      ASSERT_DOES_NOT_TAKE_THROW,
-      ASSERT_DOES_NOT_TAKE_RETHROW,
-      BREAK_OUTSIDE_OF_LOOP,
-      CONST_AND_FINAL,
-      CONST_AND_VAR,
-      CONST_CLASS,
-      CONST_CONSTRUCTOR_WITH_BODY,
-      CONST_FACTORY,
-      CONST_METHOD,
-      CONST_TYPEDEF,
-      CONSTRUCTOR_WITH_RETURN_TYPE,
-      CONTINUE_OUTSIDE_OF_LOOP,
-      CONTINUE_WITHOUT_LABEL_IN_CASE,
-      DEPRECATED_ARGUMENT_DEFINITION_TEST,
-      DEPRECATED_CLASS_TYPE_ALIAS,
-      DIRECTIVE_AFTER_DECLARATION,
-      DUPLICATE_LABEL_IN_SWITCH_STATEMENT,
-      DUPLICATED_MODIFIER,
-      EQUALITY_CANNOT_BE_EQUALITY_OPERAND,
-      EXPECTED_CASE_OR_DEFAULT,
-      EXPECTED_CLASS_MEMBER,
-      EXPECTED_EXECUTABLE,
-      EXPECTED_LIST_OR_MAP_LITERAL,
-      EXPECTED_STRING_LITERAL,
-      EXPECTED_TOKEN,
-      EXPECTED_TYPE_NAME,
-      EXPORT_DIRECTIVE_AFTER_PART_DIRECTIVE,
-      EXTERNAL_AFTER_CONST,
-      EXTERNAL_AFTER_FACTORY,
-      EXTERNAL_AFTER_STATIC,
-      EXTERNAL_CLASS,
-      EXTERNAL_CONSTRUCTOR_WITH_BODY,
-      EXTERNAL_FIELD,
-      EXTERNAL_GETTER_WITH_BODY,
-      EXTERNAL_METHOD_WITH_BODY,
-      EXTERNAL_OPERATOR_WITH_BODY,
-      EXTERNAL_SETTER_WITH_BODY,
-      EXTERNAL_TYPEDEF,
-      FACTORY_TOP_LEVEL_DECLARATION,
-      FACTORY_WITHOUT_BODY,
-      FIELD_INITIALIZER_OUTSIDE_CONSTRUCTOR,
-      FINAL_AND_VAR,
-      FINAL_CLASS,
-      FINAL_CONSTRUCTOR,
-      FINAL_METHOD,
-      FINAL_TYPEDEF,
-      FUNCTION_TYPED_PARAMETER_VAR,
-      GETTER_IN_FUNCTION,
-      GETTER_WITH_PARAMETERS,
-      ILLEGAL_ASSIGNMENT_TO_NON_ASSIGNABLE,
-      IMPLEMENTS_BEFORE_EXTENDS,
-      IMPLEMENTS_BEFORE_WITH,
-      IMPORT_DIRECTIVE_AFTER_PART_DIRECTIVE,
-      INITIALIZED_VARIABLE_IN_FOR_EACH,
-      INVALID_CODE_POINT,
-      INVALID_COMMENT_REFERENCE,
-      INVALID_HEX_ESCAPE,
-      INVALID_OPERATOR,
-      INVALID_OPERATOR_FOR_SUPER,
-      INVALID_UNICODE_ESCAPE,
-      LIBRARY_DIRECTIVE_NOT_FIRST,
-      LOCAL_FUNCTION_DECLARATION_MODIFIER,
-      MISSING_ASSIGNABLE_SELECTOR,
-      MISSING_CATCH_OR_FINALLY,
-      MISSING_CLASS_BODY,
-      MISSING_CLOSING_PARENTHESIS,
-      MISSING_CONST_FINAL_VAR_OR_TYPE,
-      MISSING_EXPRESSION_IN_THROW,
-      MISSING_FUNCTION_BODY,
-      MISSING_FUNCTION_PARAMETERS,
-      MISSING_IDENTIFIER,
-      MISSING_KEYWORD_OPERATOR,
-      MISSING_NAME_IN_LIBRARY_DIRECTIVE,
-      MISSING_NAME_IN_PART_OF_DIRECTIVE,
-      MISSING_STATEMENT,
-      MISSING_TERMINATOR_FOR_PARAMETER_GROUP,
-      MISSING_TYPEDEF_PARAMETERS,
-      MISSING_VARIABLE_IN_FOR_EACH,
-      MIXED_PARAMETER_GROUPS,
-      MULTIPLE_EXTENDS_CLAUSES,
-      MULTIPLE_IMPLEMENTS_CLAUSES,
-      MULTIPLE_LIBRARY_DIRECTIVES,
-      MULTIPLE_NAMED_PARAMETER_GROUPS,
-      MULTIPLE_PART_OF_DIRECTIVES,
-      MULTIPLE_POSITIONAL_PARAMETER_GROUPS,
-      MULTIPLE_VARIABLES_IN_FOR_EACH,
-      MULTIPLE_WITH_CLAUSES,
-      NAMED_FUNCTION_EXPRESSION,
-      NAMED_PARAMETER_OUTSIDE_GROUP,
-      NATIVE_CLAUSE_IN_NON_SDK_CODE,
-      NATIVE_FUNCTION_BODY_IN_NON_SDK_CODE,
-      NON_CONSTRUCTOR_FACTORY,
-      NON_IDENTIFIER_LIBRARY_NAME,
-      NON_PART_OF_DIRECTIVE_IN_PART,
-      NON_USER_DEFINABLE_OPERATOR,
-      NORMAL_BEFORE_OPTIONAL_PARAMETERS,
-      POSITIONAL_AFTER_NAMED_ARGUMENT,
-      POSITIONAL_PARAMETER_OUTSIDE_GROUP,
-      REDIRECTION_IN_NON_FACTORY_CONSTRUCTOR,
-      SETTER_IN_FUNCTION,
-      STATIC_AFTER_CONST,
-      STATIC_AFTER_FINAL,
-      STATIC_AFTER_VAR,
-      STATIC_CONSTRUCTOR,
-      STATIC_GETTER_WITHOUT_BODY,
-      STATIC_OPERATOR,
-      STATIC_SETTER_WITHOUT_BODY,
-      STATIC_TOP_LEVEL_DECLARATION,
-      SWITCH_HAS_CASE_AFTER_DEFAULT_CASE,
-      SWITCH_HAS_MULTIPLE_DEFAULT_CASES,
-      TOP_LEVEL_OPERATOR,
-      UNEXPECTED_TERMINATOR_FOR_PARAMETER_GROUP,
-      UNEXPECTED_TOKEN,
-      WITH_BEFORE_EXTENDS,
-      WITH_WITHOUT_EXTENDS,
-      WRONG_SEPARATOR_FOR_NAMED_PARAMETER,
-      WRONG_SEPARATOR_FOR_POSITIONAL_PARAMETER,
-      WRONG_TERMINATOR_FOR_PARAMETER_GROUP,
-      VAR_AND_TYPE,
-      VAR_AS_TYPE_NAME,
-      VAR_CLASS,
-      VAR_RETURN_TYPE,
-      VAR_TYPEDEF,
-      VOID_PARAMETER,
-      VOID_VARIABLE];
-
-  /**
-   * The severity of this error.
-   */
-  ErrorSeverity _severity;
-
-  /**
-   * The template used to create the message to be displayed for this error.
-   */
-  String _message;
-
-  /**
-   * The template used to create the correction to be displayed for this error, or `null` if
-   * there is no correction information for this error.
-   */
-  String correction8;
-
-  /**
-   * Initialize a newly created error code to have the given severity and message.
-   *
-   * @param severity the severity of the error
-   * @param message the message template used to create the message to be displayed for the error
-   */
-  ParserErrorCode.con1(String name, int ordinal, ErrorSeverity severity, String message) : super(name, ordinal) {
-    this._severity = severity;
-    this._message = message;
-  }
-
-  /**
-   * Initialize a newly created error code to have the given severity, message and correction.
-   *
-   * @param severity the severity of the error
-   * @param message the template used to create the message to be displayed for the error
-   * @param correction the template used to create the correction to be displayed for the error
-   */
-  ParserErrorCode.con2(String name, int ordinal, ErrorSeverity severity, String message, String correction) : super(name, ordinal) {
-    this._severity = severity;
-    this._message = message;
-    this.correction8 = correction;
-  }
-
-  /**
-   * Initialize a newly created error code to have the given message and a severity of ERROR.
-   *
-   * @param message the message template used to create the message to be displayed for the error
-   */
-  ParserErrorCode.con3(String name, int ordinal, String message) : this.con1(name, ordinal, ErrorSeverity.ERROR, message);
-  String get correction => correction8;
-  ErrorSeverity get errorSeverity => _severity;
-  String get message => _message;
-  ErrorType get type => ErrorType.SYNTACTIC_ERROR;
-}
-/**
- * Instances of the class {link ToFormattedSourceVisitor} write a source representation of a visited
- * AST node (and all of it's children) to a writer.
- */
-class ToFormattedSourceVisitor implements ASTVisitor<Object> {
-
-  /**
-   * The writer to which the source is to be written.
-   */
-  PrintWriter _writer;
-  int _indentLevel = 0;
-  String _indentString = "";
-
-  /**
-   * Initialize a newly created visitor to write source code representing the visited nodes to the
-   * given writer.
-   *
-   * @param writer the writer to which the source is to be written
-   */
-  ToFormattedSourceVisitor(PrintWriter writer) {
-    this._writer = writer;
-  }
-  Object visitAdjacentStrings(AdjacentStrings node) {
-    visitList5(node.strings, " ");
-    return null;
-  }
-  Object visitAnnotation(Annotation node) {
-    _writer.print('@');
-    visit(node.name);
-    visit7(".", node.constructorName);
-    visit(node.arguments);
-    return null;
-  }
-  Object visitArgumentDefinitionTest(ArgumentDefinitionTest node) {
-    _writer.print('?');
-    visit(node.identifier);
-    return null;
-  }
-  Object visitArgumentList(ArgumentList node) {
-    _writer.print('(');
-    visitList5(node.arguments, ", ");
-    _writer.print(')');
-    return null;
-  }
-  Object visitAsExpression(AsExpression node) {
-    visit(node.expression);
-    _writer.print(" as ");
-    visit(node.type);
-    return null;
-  }
-  Object visitAssertStatement(AssertStatement node) {
-    _writer.print("assert(");
-    visit(node.condition);
-    _writer.print(");");
-    return null;
-  }
-  Object visitAssignmentExpression(AssignmentExpression node) {
-    visit(node.leftHandSide);
-    _writer.print(' ');
-    _writer.print(node.operator.lexeme);
-    _writer.print(' ');
-    visit(node.rightHandSide);
-    return null;
-  }
-  Object visitBinaryExpression(BinaryExpression node) {
-    visit(node.leftOperand);
-    _writer.print(' ');
-    _writer.print(node.operator.lexeme);
-    _writer.print(' ');
-    visit(node.rightOperand);
-    return null;
-  }
-  Object visitBlock(Block node) {
-    _writer.print('{');
-    {
-      indentInc();
-      visitList5(node.statements, "\n");
-      indentDec();
-    }
-    nl2();
-    _writer.print('}');
-    return null;
-  }
-  Object visitBlockFunctionBody(BlockFunctionBody node) {
-    visit(node.block);
-    return null;
-  }
-  Object visitBooleanLiteral(BooleanLiteral node) {
-    _writer.print(node.literal.lexeme);
-    return null;
-  }
-  Object visitBreakStatement(BreakStatement node) {
-    _writer.print("break");
-    visit7(" ", node.label);
-    _writer.print(";");
-    return null;
-  }
-  Object visitCascadeExpression(CascadeExpression node) {
-    visit(node.target);
-    visitList(node.cascadeSections);
-    return null;
-  }
-  Object visitCatchClause(CatchClause node) {
-    visit7("on ", node.exceptionType);
-    if (node.catchKeyword != null) {
-      if (node.exceptionType != null) {
-        _writer.print(' ');
-      }
-      _writer.print("catch (");
-      visit(node.exceptionParameter);
-      visit7(", ", node.stackTraceParameter);
-      _writer.print(") ");
-    } else {
-      _writer.print(" ");
-    }
-    visit(node.body);
-    return null;
-  }
-  Object visitClassDeclaration(ClassDeclaration node) {
-    visit(node.documentationComment);
-    visit8(node.abstractKeyword, " ");
-    _writer.print("class ");
-    visit(node.name);
-    visit(node.typeParameters);
-    visit7(" ", node.extendsClause);
-    visit7(" ", node.withClause);
-    visit7(" ", node.implementsClause);
-    _writer.print(" {");
-    {
-      indentInc();
-      visitList5(node.members, "\n");
-      indentDec();
-    }
-    nl2();
-    _writer.print("}");
-    return null;
-  }
-  Object visitClassTypeAlias(ClassTypeAlias node) {
-    _writer.print("typedef ");
-    visit(node.name);
-    visit(node.typeParameters);
-    _writer.print(" = ");
-    if (node.abstractKeyword != null) {
-      _writer.print("abstract ");
-    }
-    visit(node.superclass);
-    visit7(" ", node.withClause);
-    visit7(" ", node.implementsClause);
-    _writer.print(";");
-    return null;
-  }
-  Object visitComment(Comment node) {
-    Token token = node.beginToken;
-    while (token != null) {
-      bool firstLine = true;
-      for (String line in StringUtils.split(token.lexeme, "\n")) {
-        if (firstLine) {
-          firstLine = false;
-          if (node.isDocumentation) {
-            nl2();
-          }
-        } else {
-          line = " ${line.trim()}";
-          line = StringUtils.replace(line, "/*", "/ *");
-        }
-        _writer.print(line);
-        nl2();
-      }
-      if (identical(token, node.endToken)) {
-        break;
-      }
-    }
-    return null;
-  }
-  Object visitCommentReference(CommentReference node) => null;
-  Object visitCompilationUnit(CompilationUnit node) {
-    ScriptTag scriptTag = node.scriptTag;
-    NodeList<Directive> directives = node.directives;
-    visit(scriptTag);
-    String prefix = scriptTag == null ? "" : " ";
-    visitList7(prefix, directives, "\n");
-    prefix = scriptTag == null && directives.isEmpty ? "" : "\n\n";
-    visitList7(prefix, node.declarations, "\n");
-    return null;
-  }
-  Object visitConditionalExpression(ConditionalExpression node) {
-    visit(node.condition);
-    _writer.print(" ? ");
-    visit(node.thenExpression);
-    _writer.print(" : ");
-    visit(node.elseExpression);
-    return null;
-  }
-  Object visitConstructorDeclaration(ConstructorDeclaration node) {
-    visit(node.documentationComment);
-    visit8(node.externalKeyword, " ");
-    visit8(node.constKeyword, " ");
-    visit8(node.factoryKeyword, " ");
-    visit(node.returnType);
-    visit7(".", node.name);
-    visit(node.parameters);
-    visitList7(" : ", node.initializers, ", ");
-    visit7(" = ", node.redirectedConstructor);
-    if (node.body is! EmptyFunctionBody) {
-      _writer.print(' ');
-    }
-    visit(node.body);
-    return null;
-  }
-  Object visitConstructorFieldInitializer(ConstructorFieldInitializer node) {
-    visit8(node.keyword, ".");
-    visit(node.fieldName);
-    _writer.print(" = ");
-    visit(node.expression);
-    return null;
-  }
-  Object visitConstructorName(ConstructorName node) {
-    visit(node.type);
-    visit7(".", node.name);
-    return null;
-  }
-  Object visitContinueStatement(ContinueStatement node) {
-    _writer.print("continue");
-    visit7(" ", node.label);
-    _writer.print(";");
-    return null;
-  }
-  Object visitDeclaredIdentifier(DeclaredIdentifier node) {
-    visit8(node.keyword, " ");
-    visit6(node.type, " ");
-    visit(node.identifier);
-    return null;
-  }
-  Object visitDefaultFormalParameter(DefaultFormalParameter node) {
-    visit(node.parameter);
-    if (node.separator != null) {
-      _writer.print(" ");
-      _writer.print(node.separator.lexeme);
-      visit7(" ", node.defaultValue);
-    }
-    return null;
-  }
-  Object visitDoStatement(DoStatement node) {
-    _writer.print("do ");
-    visit(node.body);
-    _writer.print(" while (");
-    visit(node.condition);
-    _writer.print(");");
-    return null;
-  }
-  Object visitDoubleLiteral(DoubleLiteral node) {
-    _writer.print(node.literal.lexeme);
-    return null;
-  }
-  Object visitEmptyFunctionBody(EmptyFunctionBody node) {
-    _writer.print(';');
-    return null;
-  }
-  Object visitEmptyStatement(EmptyStatement node) {
-    _writer.print(';');
-    return null;
-  }
-  Object visitExportDirective(ExportDirective node) {
-    _writer.print("export ");
-    visit(node.uri);
-    visitList7(" ", node.combinators, " ");
-    _writer.print(';');
-    return null;
-  }
-  Object visitExpressionFunctionBody(ExpressionFunctionBody node) {
-    _writer.print("=> ");
-    visit(node.expression);
-    if (node.semicolon != null) {
-      _writer.print(';');
-    }
-    return null;
-  }
-  Object visitExpressionStatement(ExpressionStatement node) {
-    visit(node.expression);
-    _writer.print(';');
-    return null;
-  }
-  Object visitExtendsClause(ExtendsClause node) {
-    _writer.print("extends ");
-    visit(node.superclass);
-    return null;
-  }
-  Object visitFieldDeclaration(FieldDeclaration node) {
-    visit(node.documentationComment);
-    visit8(node.staticKeyword, " ");
-    visit(node.fields);
-    _writer.print(";");
-    return null;
-  }
-  Object visitFieldFormalParameter(FieldFormalParameter node) {
-    visit8(node.keyword, " ");
-    visit6(node.type, " ");
-    _writer.print("this.");
-    visit(node.identifier);
-    visit(node.parameters);
-    return null;
-  }
-  Object visitForEachStatement(ForEachStatement node) {
-    DeclaredIdentifier loopVariable = node.loopVariable;
-    _writer.print("for (");
-    if (loopVariable == null) {
-      visit(node.identifier);
-    } else {
-      visit(loopVariable);
-    }
-    _writer.print(" in ");
-    visit(node.iterator);
-    _writer.print(") ");
-    visit(node.body);
-    return null;
-  }
-  Object visitFormalParameterList(FormalParameterList node) {
-    String groupEnd = null;
-    _writer.print('(');
-    NodeList<FormalParameter> parameters = node.parameters;
-    int size = parameters.length;
-    for (int i = 0; i < size; i++) {
-      FormalParameter parameter = parameters[i];
-      if (i > 0) {
-        _writer.print(", ");
-      }
-      if (groupEnd == null && parameter is DefaultFormalParameter) {
-        if (identical(parameter.kind, ParameterKind.NAMED)) {
-          groupEnd = "}";
-          _writer.print('{');
-        } else {
-          groupEnd = "]";
-          _writer.print('[');
-        }
-      }
-      parameter.accept(this);
-    }
-    if (groupEnd != null) {
-      _writer.print(groupEnd);
-    }
-    _writer.print(')');
-    return null;
-  }
-  Object visitForStatement(ForStatement node) {
-    Expression initialization = node.initialization;
-    _writer.print("for (");
-    if (initialization != null) {
-      visit(initialization);
-    } else {
-      visit(node.variables);
-    }
-    _writer.print(";");
-    visit7(" ", node.condition);
-    _writer.print(";");
-    visitList7(" ", node.updaters, ", ");
-    _writer.print(") ");
-    visit(node.body);
-    return null;
-  }
-  Object visitFunctionDeclaration(FunctionDeclaration node) {
-    visit6(node.returnType, " ");
-    visit8(node.propertyKeyword, " ");
-    visit(node.name);
-    visit(node.functionExpression);
-    return null;
-  }
-  Object visitFunctionDeclarationStatement(FunctionDeclarationStatement node) {
-    visit(node.functionDeclaration);
-    _writer.print(';');
-    return null;
-  }
-  Object visitFunctionExpression(FunctionExpression node) {
-    visit(node.parameters);
-    _writer.print(' ');
-    visit(node.body);
-    return null;
-  }
-  Object visitFunctionExpressionInvocation(FunctionExpressionInvocation node) {
-    visit(node.function);
-    visit(node.argumentList);
-    return null;
-  }
-  Object visitFunctionTypeAlias(FunctionTypeAlias node) {
-    _writer.print("typedef ");
-    visit6(node.returnType, " ");
-    visit(node.name);
-    visit(node.typeParameters);
-    visit(node.parameters);
-    _writer.print(";");
-    return null;
-  }
-  Object visitFunctionTypedFormalParameter(FunctionTypedFormalParameter node) {
-    visit6(node.returnType, " ");
-    visit(node.identifier);
-    visit(node.parameters);
-    return null;
-  }
-  Object visitHideCombinator(HideCombinator node) {
-    _writer.print("hide ");
-    visitList5(node.hiddenNames, ", ");
-    return null;
-  }
-  Object visitIfStatement(IfStatement node) {
-    _writer.print("if (");
-    visit(node.condition);
-    _writer.print(") ");
-    visit(node.thenStatement);
-    visit7(" else ", node.elseStatement);
-    return null;
-  }
-  Object visitImplementsClause(ImplementsClause node) {
-    _writer.print("implements ");
-    visitList5(node.interfaces, ", ");
-    return null;
-  }
-  Object visitImportDirective(ImportDirective node) {
-    _writer.print("import ");
-    visit(node.uri);
-    visit7(" as ", node.prefix);
-    visitList7(" ", node.combinators, " ");
-    _writer.print(';');
-    return null;
-  }
-  Object visitIndexExpression(IndexExpression node) {
-    if (node.isCascaded) {
-      _writer.print("..");
-    } else {
-      visit(node.target);
-    }
-    _writer.print('[');
-    visit(node.index);
-    _writer.print(']');
-    return null;
-  }
-  Object visitInstanceCreationExpression(InstanceCreationExpression node) {
-    visit8(node.keyword, " ");
-    visit(node.constructorName);
-    visit(node.argumentList);
-    return null;
-  }
-  Object visitIntegerLiteral(IntegerLiteral node) {
-    _writer.print(node.literal.lexeme);
-    return null;
-  }
-  Object visitInterpolationExpression(InterpolationExpression node) {
-    if (node.rightBracket != null) {
-      _writer.print("\${");
-      visit(node.expression);
-      _writer.print("}");
-    } else {
-      _writer.print("\$");
-      visit(node.expression);
-    }
-    return null;
-  }
-  Object visitInterpolationString(InterpolationString node) {
-    _writer.print(node.contents.lexeme);
-    return null;
-  }
-  Object visitIsExpression(IsExpression node) {
-    visit(node.expression);
-    if (node.notOperator == null) {
-      _writer.print(" is ");
-    } else {
-      _writer.print(" is! ");
-    }
-    visit(node.type);
-    return null;
-  }
-  Object visitLabel(Label node) {
-    visit(node.label);
-    _writer.print(":");
-    return null;
-  }
-  Object visitLabeledStatement(LabeledStatement node) {
-    visitList6(node.labels, " ", " ");
-    visit(node.statement);
-    return null;
-  }
-  Object visitLibraryDirective(LibraryDirective node) {
-    _writer.print("library ");
-    visit(node.name);
-    _writer.print(';');
-    nl();
-    return null;
-  }
-  Object visitLibraryIdentifier(LibraryIdentifier node) {
-    _writer.print(node.name);
-    return null;
-  }
-  Object visitListLiteral(ListLiteral node) {
-    if (node.constKeyword != null) {
-      _writer.print(node.constKeyword.lexeme);
-      _writer.print(' ');
-    }
-    visit6(node.typeArguments, " ");
-    _writer.print("[");
-    {
-      NodeList<Expression> elements = node.elements;
-      if (elements.length < 2 || elements.toString().length < 60) {
-        visitList5(elements, ", ");
-      } else {
-        String elementIndent = "${_indentString}    ";
-        _writer.print("\n");
-        _writer.print(elementIndent);
-        visitList5(elements, ",\n${elementIndent}");
-      }
-    }
-    _writer.print("]");
-    return null;
-  }
-  Object visitMapLiteral(MapLiteral node) {
-    if (node.constKeyword != null) {
-      _writer.print(node.constKeyword.lexeme);
-      _writer.print(' ');
-    }
-    visit6(node.typeArguments, " ");
-    _writer.print("{");
-    visitList5(node.entries, ", ");
-    _writer.print("}");
-    return null;
-  }
-  Object visitMapLiteralEntry(MapLiteralEntry node) {
-    visit(node.key);
-    _writer.print(" : ");
-    visit(node.value);
-    return null;
-  }
-  Object visitMethodDeclaration(MethodDeclaration node) {
-    visit(node.documentationComment);
-    visit8(node.externalKeyword, " ");
-    visit8(node.modifierKeyword, " ");
-    visit6(node.returnType, " ");
-    visit8(node.propertyKeyword, " ");
-    visit8(node.operatorKeyword, " ");
-    visit(node.name);
-    if (!node.isGetter) {
-      visit(node.parameters);
-    }
-    if (node.body is! EmptyFunctionBody) {
-      _writer.print(' ');
-    }
-    visit(node.body);
-    return null;
-  }
-  Object visitMethodInvocation(MethodInvocation node) {
-    if (node.isCascaded) {
-      _writer.print("..");
-    } else {
-      visit6(node.target, ".");
-    }
-    visit(node.methodName);
-    visit(node.argumentList);
-    return null;
-  }
-  Object visitNamedExpression(NamedExpression node) {
-    visit(node.name);
-    visit7(" ", node.expression);
-    return null;
-  }
-  Object visitNativeClause(NativeClause node) {
-    _writer.print("native ");
-    visit(node.name);
-    return null;
-  }
-  Object visitNativeFunctionBody(NativeFunctionBody node) {
-    _writer.print("native ");
-    visit(node.stringLiteral);
-    _writer.print(';');
-    return null;
-  }
-  Object visitNullLiteral(NullLiteral node) {
-    _writer.print("null");
-    return null;
-  }
-  Object visitParenthesizedExpression(ParenthesizedExpression node) {
-    _writer.print('(');
-    visit(node.expression);
-    _writer.print(')');
-    return null;
-  }
-  Object visitPartDirective(PartDirective node) {
-    _writer.print("part ");
-    visit(node.uri);
-    _writer.print(';');
-    return null;
-  }
-  Object visitPartOfDirective(PartOfDirective node) {
-    _writer.print("part of ");
-    visit(node.libraryName);
-    _writer.print(';');
-    return null;
-  }
-  Object visitPostfixExpression(PostfixExpression node) {
-    visit(node.operand);
-    _writer.print(node.operator.lexeme);
-    return null;
-  }
-  Object visitPrefixedIdentifier(PrefixedIdentifier node) {
-    visit(node.prefix);
-    _writer.print('.');
-    visit(node.identifier);
-    return null;
-  }
-  Object visitPrefixExpression(PrefixExpression node) {
-    _writer.print(node.operator.lexeme);
-    visit(node.operand);
-    return null;
-  }
-  Object visitPropertyAccess(PropertyAccess node) {
-    if (node.isCascaded) {
-      _writer.print("..");
-    } else {
-      visit6(node.target, ".");
-    }
-    visit(node.propertyName);
-    return null;
-  }
-  Object visitRedirectingConstructorInvocation(RedirectingConstructorInvocation node) {
-    _writer.print("this");
-    visit7(".", node.constructorName);
-    visit(node.argumentList);
-    return null;
-  }
-  Object visitRethrowExpression(RethrowExpression node) {
-    _writer.print("rethrow");
-    return null;
-  }
-  Object visitReturnStatement(ReturnStatement node) {
-    Expression expression = node.expression;
-    if (expression == null) {
-      _writer.print("return;");
-    } else {
-      _writer.print("return ");
-      expression.accept(this);
-      _writer.print(";");
-    }
-    return null;
-  }
-  Object visitScriptTag(ScriptTag node) {
-    _writer.print(node.scriptTag.lexeme);
-    return null;
-  }
-  Object visitShowCombinator(ShowCombinator node) {
-    _writer.print("show ");
-    visitList5(node.shownNames, ", ");
-    return null;
-  }
-  Object visitSimpleFormalParameter(SimpleFormalParameter node) {
-    visit8(node.keyword, " ");
-    visit6(node.type, " ");
-    visit(node.identifier);
-    return null;
-  }
-  Object visitSimpleIdentifier(SimpleIdentifier node) {
-    _writer.print(node.token.lexeme);
-    return null;
-  }
-  Object visitSimpleStringLiteral(SimpleStringLiteral node) {
-    _writer.print(node.literal.lexeme);
-    return null;
-  }
-  Object visitStringInterpolation(StringInterpolation node) {
-    visitList(node.elements);
-    return null;
-  }
-  Object visitSuperConstructorInvocation(SuperConstructorInvocation node) {
-    _writer.print("super");
-    visit7(".", node.constructorName);
-    visit(node.argumentList);
-    return null;
-  }
-  Object visitSuperExpression(SuperExpression node) {
-    _writer.print("super");
-    return null;
-  }
-  Object visitSwitchCase(SwitchCase node) {
-    visitList6(node.labels, " ", " ");
-    _writer.print("case ");
-    visit(node.expression);
-    _writer.print(": ");
-    {
-      indentInc();
-      visitList5(node.statements, "\n");
-      indentDec();
-    }
-    return null;
-  }
-  Object visitSwitchDefault(SwitchDefault node) {
-    visitList6(node.labels, " ", " ");
-    _writer.print("default: ");
-    {
-      indentInc();
-      visitList5(node.statements, "\n");
-      indentDec();
-    }
-    return null;
-  }
-  Object visitSwitchStatement(SwitchStatement node) {
-    _writer.print("switch (");
-    visit(node.expression);
-    _writer.print(") {");
-    {
-      indentInc();
-      visitList5(node.members, "\n");
-      indentDec();
-    }
-    nl2();
-    _writer.print('}');
-    return null;
-  }
-  Object visitSymbolLiteral(SymbolLiteral node) {
-    _writer.print("#");
-    visitList8(node.components, ".");
-    return null;
-  }
-  Object visitThisExpression(ThisExpression node) {
-    _writer.print("this");
-    return null;
-  }
-  Object visitThrowExpression(ThrowExpression node) {
-    _writer.print("throw ");
-    visit(node.expression);
-    return null;
-  }
-  Object visitTopLevelVariableDeclaration(TopLevelVariableDeclaration node) {
-    visit6(node.variables, ";");
-    return null;
-  }
-  Object visitTryStatement(TryStatement node) {
-    _writer.print("try ");
-    visit(node.body);
-    visitList7(" ", node.catchClauses, " ");
-    visit7(" finally ", node.finallyBlock);
-    return null;
-  }
-  Object visitTypeArgumentList(TypeArgumentList node) {
-    _writer.print('<');
-    visitList5(node.arguments, ", ");
-    _writer.print('>');
-    return null;
-  }
-  Object visitTypeName(TypeName node) {
-    visit(node.name);
-    visit(node.typeArguments);
-    return null;
-  }
-  Object visitTypeParameter(TypeParameter node) {
-    visit(node.name);
-    visit7(" extends ", node.bound);
-    return null;
-  }
-  Object visitTypeParameterList(TypeParameterList node) {
-    _writer.print('<');
-    visitList5(node.typeParameters, ", ");
-    _writer.print('>');
-    return null;
-  }
-  Object visitVariableDeclaration(VariableDeclaration node) {
-    visit(node.name);
-    visit7(" = ", node.initializer);
-    return null;
-  }
-  Object visitVariableDeclarationList(VariableDeclarationList node) {
-    visit8(node.keyword, " ");
-    visit6(node.type, " ");
-    visitList5(node.variables, ", ");
-    return null;
-  }
-  Object visitVariableDeclarationStatement(VariableDeclarationStatement node) {
-    visit(node.variables);
-    _writer.print(";");
-    return null;
-  }
-  Object visitWhileStatement(WhileStatement node) {
-    _writer.print("while (");
-    visit(node.condition);
-    _writer.print(") ");
-    visit(node.body);
-    return null;
-  }
-  Object visitWithClause(WithClause node) {
-    _writer.print("with ");
-    visitList5(node.mixinTypes, ", ");
-    return null;
-  }
-  void indent() {
-    _writer.print(_indentString);
-  }
-  void indentDec() {
-    _indentLevel -= 2;
-    _indentString = StringUtils.repeat(" ", _indentLevel);
-  }
-  void indentInc() {
-    _indentLevel += 2;
-    _indentString = StringUtils.repeat(" ", _indentLevel);
-  }
-  void nl() {
-    _writer.print("\n");
-  }
-  void nl2() {
-    nl();
-    indent();
-  }
-
-  /**
-   * Safely visit the given node.
-   *
-   * @param node the node to be visited
-   */
-  void visit(ASTNode node) {
-    if (node != null) {
-      node.accept(this);
-    }
-  }
-
-  /**
-   * Safely visit the given node, printing the suffix after the node if it is non-<code>null</code>.
-   *
-   * @param suffix the suffix to be printed if there is a node to visit
-   * @param node the node to be visited
-   */
-  void visit6(ASTNode node, String suffix) {
-    if (node != null) {
-      node.accept(this);
-      _writer.print(suffix);
-    }
-  }
-
-  /**
-   * Safely visit the given node, printing the prefix before the node if it is non-<code>null</code>
-   * .
-   *
-   * @param prefix the prefix to be printed if there is a node to visit
-   * @param node the node to be visited
-   */
-  void visit7(String prefix, ASTNode node) {
-    if (node != null) {
-      _writer.print(prefix);
-      node.accept(this);
-    }
-  }
-
-  /**
-   * Safely visit the given node, printing the suffix after the node if it is non-<code>null</code>.
-   *
-   * @param suffix the suffix to be printed if there is a node to visit
-   * @param node the node to be visited
-   */
-  void visit8(Token token, String suffix) {
-    if (token != null) {
-      _writer.print(token.lexeme);
-      _writer.print(suffix);
-    }
-  }
-
-  /**
-   * Print a list of nodes without any separation.
-   *
-   * @param nodes the nodes to be printed
-   * @param separator the separator to be printed between adjacent nodes
-   */
-  void visitList(NodeList<ASTNode> nodes) {
-    visitList5(nodes, "");
-  }
-
-  /**
-   * Print a list of nodes, separated by the given separator.
-   *
-   * @param nodes the nodes to be printed
-   * @param separator the separator to be printed between adjacent nodes
-   */
-  void visitList5(NodeList<ASTNode> nodes, String separator) {
-    if (nodes != null) {
-      int size = nodes.length;
-      for (int i = 0; i < size; i++) {
-        if ("\n" == separator) {
-          _writer.print("\n");
-          indent();
-        } else if (i > 0) {
-          _writer.print(separator);
-        }
-        nodes[i].accept(this);
-      }
-    }
-  }
-
-  /**
-   * Print a list of nodes, separated by the given separator.
-   *
-   * @param nodes the nodes to be printed
-   * @param separator the separator to be printed between adjacent nodes
-   * @param suffix the suffix to be printed if the list is not empty
-   */
-  void visitList6(NodeList<ASTNode> nodes, String separator, String suffix) {
-    if (nodes != null) {
-      int size = nodes.length;
-      if (size > 0) {
-        for (int i = 0; i < size; i++) {
-          if (i > 0) {
-            _writer.print(separator);
-          }
-          nodes[i].accept(this);
-        }
-        _writer.print(suffix);
-      }
-    }
-  }
-
-  /**
-   * Print a list of nodes, separated by the given separator.
-   *
-   * @param prefix the prefix to be printed if the list is not empty
-   * @param nodes the nodes to be printed
-   * @param separator the separator to be printed between adjacent nodes
-   */
-  void visitList7(String prefix, NodeList<ASTNode> nodes, String separator) {
-    if (nodes != null) {
-      int size = nodes.length;
-      if (size > 0) {
-        _writer.print(prefix);
-        for (int i = 0; i < size; i++) {
-          if (i > 0) {
-            _writer.print(separator);
-          }
-          nodes[i].accept(this);
-        }
-      }
-    }
-  }
-
-  /**
-   * Print a list of tokens, separated by the given separator.
-   *
-   * @param tokens the tokens to be printed
-   * @param separator the separator to be printed between adjacent tokens
-   */
-  void visitList8(List<Token> tokens, String separator) {
-    int size = tokens.length;
-    for (int i = 0; i < size; i++) {
-      if ("\n" == separator) {
-        _writer.print("\n");
-        indent();
-      } else if (i > 0) {
-        _writer.print(separator);
-      }
-      _writer.print(tokens[i].lexeme);
-    }
-  }
-}