anchor.diff:    @override
     SdkLibrary getSdkLibrary(String dartUri) {
       SdkLibrary result = _libraryMap.getLibrary(dartUri);
  -    print("= ChromeDartSdk.getSdkLibrary(${dartUri}): ${result== null ? 'null' : result.path}");
  +    _DebugLogger.instance.debug("= ChromeDartSdk.getSdkLibrary('${dartUri}'): '${result== null ? 'null' : result.path}'");
       return result;
     }
   
  
positive.code:    */
    @override
    Source resolveAbsolute(Uri uri) {
      print("> PackageUriResolver.resolveAbsolute(${uri})");
      Source result;
      if (!isPackageUri(uri)) {
        result = null;
      } else {
        result = context.getSource(uri.toString());
      }
      print("< PackageUriResolver.resolveAbsolute(${uri}): ${result == null ? 'null' : result.uri}");
      return result;
    }
  }
  
negative.code:   final Map<String, FileSource> _sources = {};
  
    ProjectContext(this.id, this.sdk, this.provider) {
      AnalysisEngine.instance.logger = new _AnalysisEngineDebugLogger();
      context = AnalysisEngine.instance.createAnalysisContext();
      context.sourceFactory = new SourceFactory([
          new CustomDartUriResolver(sdk),
  