anchor.diff:          new DartKCompilerConfiguration(isHostChecked: isHostChecked,
               useSdk: useSdk)));
   
  -    return new ComposedCompilerConfiguration(nested);
  +    return new ComposedCompilerConfiguration(nested, isPrecompiler: false);
     }
   }
   
  
positive.code:       List<String> sharedOptions,
        List<String> originalArguments,
        CommandArtifact artifact) {
      return <String>[artifact.filename];
    }
  
    static ComposedCompilerConfiguration createDartKPConfiguration(
  
negative.code:         new PrecompilerCompilerConfiguration(
            arch: arch, useBlobs: useBlobs, isAndroid: isAndroid)));
  
      return new ComposedCompilerConfiguration(nested, isPrecompiler: true);
    }
  
    static ComposedCompilerConfiguration createDartKConfiguration(
  