anchor.diff:      implements MoveFileRefactoring {
     final ResourceProvider resourceProvider;
     final pathos.Context pathContext;
  -  final RefactoringWorkspace workspace;
  +  final RefactoringWorkspace refactoringWorkspace;
     final Source source;
     AnalysisDriver driver;
   
  
positive.code: 
    final packagePrefixedStringPattern = new RegExp(r'''^r?['"]+package:''');
  
    MoveFileRefactoringImpl(ResourceProvider resourceProvider, this.workspace,
        this.source, this.oldFile)
        : resourceProvider = resourceProvider,
          pathContext = resourceProvider.pathContext {
      if (source != null) {
  
negative.code: 
      // Update incoming references to this file
      List<SearchMatch> matches =
          await refactoringWorkspace.searchEngine.searchReferences(element);
      List<SourceReference> references = getSourceReferences(matches);
      for (SourceReference reference in references) {
        await changeBuilder.addFileEdit(reference.file, (builder) {
  