anchor.diff:    }
   
     Future<void> _addProposal_joinVariableDeclaration_onAssignment() async {
  -    // TODO(brianwilkerson) Determine whether this await is necessary.
  -    await null;
       // check that node is LHS in assignment
       if (node is SimpleIdentifier &&
           node.parent is AssignmentExpression &&
  
positive.code: 
    Future<void> _convertFunctionTypeAliasToGenericTypeAlias(
        FunctionTypeAlias node) async {
      // TODO(brianwilkerson) Determine whether this await is necessary.
      await null;
      if (!_allParametersHaveTypes(node.parameters)) {
        return;
      }
  
negative.code:   }
  
    Future<void> _addProposal_flutterSwapWithParent() async {
      InstanceCreationExpression child = flutter.identifyNewExpression(node);
      if (!flutter.isWidgetCreation(child)) {
        _coverageMarker();
  