anchor.diff:        _generator = generator != null
             ? generator
             : await IncrementalKernelGenerator.newInstance(
  -              compilerOptions, Uri.base.resolve(_filename),
  +              compilerOptions, filenameUri,
                 useMinimalGenerator: true);
         final DeltaProgram deltaProgram =
             await _runWithPrintRedirection(() => _generator.computeDelta());
  
positive.code:   }
  
    Uri _ensureFolderPath(String path) {
      // This is a URI, not a file path, so the forward slash is correct even
      // on Windows.
      if (!path.endsWith('/')) {
        path = '$path/';
      }
      return Uri.base.resolve(path);
    }
  
    /// Runs the given function [f] in a Zone that redirects all prints into
  
negative.code:     ArgResults options, {
      IncrementalKernelGenerator generator,
    }) async {
      final Uri filenameUri = Uri.base.resolveUri(new Uri.file(filename));
      _kernelBinaryFilename = "$filename.dill";
      final String boundaryKey = new Uuid().generateV4();
      _outputStream.writeln("result $boundaryKey");
  