anchor.diff:    }
   }
   
  -/// Common configuration for dart2js-based tools, such as dart2js.
  -class Dart2xCompilerConfiguration extends CompilerConfiguration {
  +/// Configuration for dart2js.
  +class Dart2jsCompilerConfiguration extends CompilerConfiguration {
     static final Map<String, List<Uri>> _bootstrapDependenciesCache = {};
   
  -  final String moniker;
  -
  -  Dart2xCompilerConfiguration(this.moniker, TestConfiguration configuration)
  +  Dart2jsCompilerConfiguration(TestConfiguration configuration)
         : super._subclass(configuration);
   
     String computeCompilerPath() {
  
positive.code:     arguments = arguments.toList();
      arguments.add('--out=$outputFileName');
  
      return CompilationCommand(moniker, outputFileName, bootstrapDependencies(),
          computeCompilerPath(), arguments, environmentOverrides,
          alwaysCompile: !_useSdk);
    }
  
  
negative.code:                   .resolve('dart-sdk/bin/snapshots/dart2js.dart.snapshot')
              ]);
    }
  
    List<String> computeCompilerArguments(
        TestFile testFile, List<String> vmOptions, List<String> args) {
  