Fix for searching LocalVariableElement of DeclaredIdentifier.

pkg/analyzer/lib/src/dart/element/element.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.dart.element.element;
 
 import 'dart:collection';
 import 'dart:math' show min;
 
 import 'package:analyzer/dart/ast/ast.dart';
@@ skipping 3740 matching lines @@
   accept(ElementVisitor visitor) => visitor.visitLocalVariableElement(this);
 
   @override
   void appendTo(StringBuffer buffer) {
     buffer.write(type);
     buffer.write(" ");
     buffer.write(displayName);
   }
 
   @override
-  VariableDeclaration computeNode() =>
-      getNodeMatching((node) => node is VariableDeclaration);
+  Declaration computeNode() => getNodeMatching(
+      (node) => node is DeclaredIdentifier || node is VariableDeclaration);
 
   /**
    * Set the visible range for this element to the range starting at the given
    * [offset] with the given [length].
    */
   void setVisibleRange(int offset, int length) {
     _visibleRangeOffset = offset;
     _visibleRangeLength = length;
   }
 }
@@ skipping 1157 matching lines @@
 
   @override
   void visitElement(Element element) {
     int offset = element.nameOffset;
     if (offset != -1) {
       map[offset] = element;
     }
     super.visitElement(element);
   }
 }