anchor.diff:    @failingTest
     void test_constructors_inferFromArguments_redirectingFactory() {
       super.test_constructors_inferFromArguments_redirectingFactory();
  -  }
  -
  -  @override
  -  @failingTest
  -  void test_futureThen() {
  -    super.test_futureThen();
  -  }
  -
  -  @override
  -  @failingTest
  -  void test_futureThen_conditional() {
  -    super.test_futureThen_conditional();
  -  }
  -
  -  @override
  -  @failingTest
  -  void test_futureThen_upwards() {
  -    super.test_futureThen_upwards();
  -  }
  -
  -  @override
  -  @failingTest
  -  void test_futureUnion_asyncConditional() {
  -    super.test_futureUnion_asyncConditional();
  -  }
  -
  -  @override
  -  @failingTest
  -  void test_futureUnion_downwards() {
  -    super.test_futureUnion_downwards();
     }
   
     @override
  
positive.code: abstract class _AstResynthesizeTestMixin
      implements _AstResynthesizeTestMixinInterface {
    final Set<Source> serializedSources = new Set<Source>();
    final PackageBundleAssembler bundleAssembler = new PackageBundleAssembler();
    final Map<String, UnlinkedUnitBuilder> uriToUnit =
        <String, UnlinkedUnitBuilder>{};
  
  
negative.code:     for (Source otherSource in otherLibrarySources) {
        _checkSource(resynthesizer, otherSource);
      }
      _reset();
      return resynthesized.definingCompilationUnit;
    }
  
  