Resynthesize untyped List / Map.

pkg/analyzer/lib/src/generated/testing/ast_factory.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library analyzer.src.generated.testing.ast_factory;
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/src/dart/ast/ast.dart';
 import 'package:analyzer/src/generated/scanner.dart';
@@ skipping 782 matching lines @@
           entries,
           TokenFactory.tokenFromType(TokenType.CLOSE_CURLY_BRACKET));
 
   static MapLiteral mapLiteral2([List<MapLiteralEntry> entries]) =>
       mapLiteral(null, null, entries);
 
   static MapLiteralEntry mapLiteralEntry(String key, Expression value) =>
       new MapLiteralEntry(
           string2(key), TokenFactory.tokenFromType(TokenType.COLON), value);
 
+  static MapLiteralEntry mapLiteralEntry2(Expression key, Expression value) =>
+      new MapLiteralEntry(
+          key, TokenFactory.tokenFromType(TokenType.COLON), value);
+
   static MethodDeclaration methodDeclaration(
           Keyword modifier,
           TypeName returnType,
           Keyword property,
           Keyword operator,
           SimpleIdentifier name,
           FormalParameterList parameters) =>
       new MethodDeclaration(
           null,
           null,
@@ skipping 444 matching lines @@
           expression,
           TokenFactory.tokenFromType(TokenType.SEMICOLON));
 
   static YieldStatement yieldStatement(Expression expression) =>
       new YieldStatement(
           TokenFactory.tokenFromTypeAndString(TokenType.IDENTIFIER, "yield"),
           null,
           expression,
           TokenFactory.tokenFromType(TokenType.SEMICOLON));
 }