anchor.diff:    }
   
     Future<void> _addProposal_assignToLocalVariable() async {
  -    // TODO(brianwilkerson) Determine whether this await is necessary.
  -    await null;
       // prepare enclosing ExpressionStatement
       ExpressionStatement expressionStatement;
       for (AstNode node = this.node; node != null; node = node.parent) {
  
positive.code:   }
  
    Future<void> _addProposal_flutterRemoveWidget_multipleChildren() async {
      // TODO(brianwilkerson) Determine whether this await is necessary.
      await null;
      var widgetCreation = flutter.identifyNewExpression(node);
      if (widgetCreation == null) {
        return;
  
negative.code:   }
  
    Future<void> _addProposal_flutterMoveWidgetUp() async {
      var widget = flutter.identifyWidgetExpression(node);
      if (widget == null) {
        return;
  