anchor.diff:    }
   
     Future<void> _addFix_removeUnusedCatchClause() async {
  -    // TODO(brianwilkerson) Determine whether this await is necessary.
  -    await null;
       if (node is SimpleIdentifier) {
         AstNode catchClause = node.parent;
         if (catchClause is CatchClause &&
  
positive.code:   }
  
    Future<void> _addFix_replaceVarWithDynamic() async {
      // TODO(brianwilkerson) Determine whether this await is necessary.
      await null;
      var changeBuilder = _newDartChangeBuilder();
      await changeBuilder.addFileEdit(file, (DartFileEditBuilder builder) {
        builder.addSimpleReplacement(range.error(error), 'dynamic');
  
negative.code:   }
  
    Future<void> _addFix_importLibrary_withFunction() async {
      if (node is SimpleIdentifier) {
        if (node.parent is MethodInvocation) {
          MethodInvocation invocation = node.parent as MethodInvocation;
  