Support accessing the parameter element when there is no name

pkg/analyzer/lib/src/generated/resolver.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library analyzer.src.generated.resolver;
 
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/standard_resolution_map.dart';
@@ skipping 10058 matching lines @@
   @override
   Object visitSimpleFormalParameter(SimpleFormalParameter node) {
     super.visitSimpleFormalParameter(node);
     DartType declaredType;
     TypeAnnotation typeName = node.type;
     if (typeName == null) {
       declaredType = _dynamicType;
     } else {
       declaredType = _typeNameResolver._getType(typeName);
     }
-    Element element = node.identifier.staticElement;
+    Element element = node.element;
     if (element is ParameterElementImpl) {
       element.declaredType = declaredType;
     } else {
       // TODO(brianwilkerson) Report the internal error.
     }
     return null;
   }
 
   @override
   Object visitSuperExpression(SuperExpression node) {
@@ skipping 809 matching lines @@
       return null;
     }
     if (identical(node.staticElement, variable)) {
       if (node.inSetterContext()) {
         result = true;
       }
     }
     return null;
   }
 }