anchor.diff:      // Builders contain mappings from part uri to builder, meaning the same
       // builder can exist multiple times in the values list.
       Set<Uri> seenUris = new Set<Uri>();
  -    List<LibraryBuilder> result = <LibraryBuilder>[];
       for (LibraryBuilder builder in builders.values) {
         if (builder.isPart) continue;
         // TODO(jensj/ahe): This line can probably go away once
  
positive.code:     }
  
      addBuilderAndInvalidateUris(Uri uri, LibraryBuilder library) {
        builders[uri] = library;
        if (isInvalidated(uri, library.target.fileUri)) {
          invalidatedImportUris.add(uri);
  
negative.code:       return <LibraryBuilder>[];
      }
  
      List<LibraryBuilder> result = <LibraryBuilder>[];
  
      // Maps all non-platform LibraryBuilders from their import URI.
      Map<Uri, LibraryBuilder> builders = <Uri, LibraryBuilder>{};
  
  