Scanner/parser support for DEP 9 (null-aware operators).

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.
 
 // 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.testing.ast_factory;
 
 import 'package:analyzer/src/generated/ast.dart';
@@ skipping 678 matching lines @@
       new PostfixExpression(expression, TokenFactory.tokenFromType(operator));
 
   static PrefixExpression prefixExpression(
           TokenType operator, Expression expression) =>
       new PrefixExpression(TokenFactory.tokenFromType(operator), expression);
 
   static PropertyAccess propertyAccess(
       Expression target, SimpleIdentifier propertyName) => new PropertyAccess(
       target, TokenFactory.tokenFromType(TokenType.PERIOD), propertyName);
 
-  static PropertyAccess propertyAccess2(
-      Expression target, String propertyName) => new PropertyAccess(target,
-      TokenFactory.tokenFromType(TokenType.PERIOD), identifier3(propertyName));
+  static PropertyAccess propertyAccess2(Expression target, String propertyName,
+      [TokenType operator = TokenType.PERIOD]) => new PropertyAccess(
+      target, TokenFactory.tokenFromType(operator), identifier3(propertyName));
 
   static RedirectingConstructorInvocation redirectingConstructorInvocation(
           [List<Expression> arguments]) =>
       redirectingConstructorInvocation2(null, arguments);
 
   static RedirectingConstructorInvocation redirectingConstructorInvocation2(
           String constructorName, [List<Expression> arguments]) =>
       new RedirectingConstructorInvocation(
           TokenFactory.tokenFromKeyword(Keyword.THIS), constructorName == null
               ? null
@@ skipping 231 matching lines @@
       new YieldStatement(
           TokenFactory.tokenFromTypeAndString(TokenType.IDENTIFIER, "yield"),
           TokenFactory.tokenFromType(TokenType.STAR), expression,
           TokenFactory.tokenFromType(TokenType.SEMICOLON));
 
   static YieldStatement yieldStatement(
       Expression expression) => new YieldStatement(
       TokenFactory.tokenFromTypeAndString(TokenType.IDENTIFIER, "yield"), null,
       expression, TokenFactory.tokenFromType(TokenType.SEMICOLON));
 }