Switch on null-aware operators by default in analyzer.

pkg/analyzer/test/generated/engine_test.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.engine_test;
 
 import 'dart:async';
@@ skipping 2223 matching lines @@
 
 @reflectiveTest
 class AnalysisOptionsImplTest extends EngineTestCase {
   void test_AnalysisOptionsImpl_copy() {
     bool booleanValue = true;
     for (int i = 0; i < 2; i++, booleanValue = !booleanValue) {
       AnalysisOptionsImpl options = new AnalysisOptionsImpl();
       options.analyzeFunctionBodies = booleanValue;
       options.cacheSize = i;
       options.dart2jsHint = booleanValue;
-      options.enableNullAwareOperators = booleanValue;
       options.enableStrictCallChecks = booleanValue;
       options.generateImplicitErrors = booleanValue;
       options.generateSdkErrors = booleanValue;
       options.hint = booleanValue;
       options.incremental = booleanValue;
       options.preserveComments = booleanValue;
       AnalysisOptionsImpl copy = new AnalysisOptionsImpl.from(options);
       expect(copy.analyzeFunctionBodies, options.analyzeFunctionBodies);
       expect(copy.cacheSize, options.cacheSize);
       expect(copy.dart2jsHint, options.dart2jsHint);
-      expect(copy.enableNullAwareOperators, options.enableNullAwareOperators);
       expect(copy.enableStrictCallChecks, options.enableStrictCallChecks);
       expect(copy.generateImplicitErrors, options.generateImplicitErrors);
       expect(copy.generateSdkErrors, options.generateSdkErrors);
       expect(copy.hint, options.hint);
       expect(copy.incremental, options.incremental);
       expect(copy.preserveComments, options.preserveComments);
     }
   }
 
   void test_analyzeFunctionBodies() {
@@ skipping 4399 matching lines @@
   @override
   bool exists() => true;
 }
 
 class _UniversalCachePartitionTest_test_setMaxCacheSize
     implements CacheRetentionPolicy {
   @override
   RetentionPriority getAstPriority(Source source, SourceEntry sourceEntry) =>
       RetentionPriority.LOW;
 }