Issue 23181. Fix for ParameterElement.node.

pkg/analyzer/lib/src/generated/element_handle.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.
 
 // This code was auto-generated, is not intended to be edited, and is subject to
 // significant change. Please see the README file for more information.
 
 library engine.element_handle;
 
 import 'ast.dart';
@@ skipping 582 matching lines @@
   ClassElement get enclosingElement => actualElement.enclosingElement;
 
   @override
   bool get isEnumConstant => actualElement.isEnumConstant;
 
   @override
   bool get isStatic => actualElement.isStatic;
 
   @override
   ElementKind get kind => ElementKind.FIELD;
+
+  @override
+  VariableDeclaration get node => actualElement.node;
 }
 
 /**
  * Instances of the class `FunctionElementHandle` implement a handle to a
  * `FunctionElement`.
  */
 class FunctionElementHandle extends ExecutableElementHandle
     implements FunctionElement {
   /**
    * Initialize a newly created element handle to represent the given element.
@@ skipping 219 matching lines @@
   LocalVariableElementHandle(LocalVariableElement element) : super(element);
 
   @override
   LocalVariableElement get actualElement =>
       super.actualElement as LocalVariableElement;
 
   @override
   ElementKind get kind => ElementKind.LOCAL_VARIABLE;
 
   @override
+  VariableDeclaration get node => actualElement.node;
+
+  @override
   SourceRange get visibleRange => actualElement.visibleRange;
 }
 
 /**
  * Instances of the class `MethodElementHandle` implement a handle to a `MethodElement`.
  */
 class MethodElementHandle extends ExecutableElementHandle
     implements MethodElement {
   /**
    * Initialize a newly created element handle to represent the given element.
@@ skipping 226 matching lines @@
 
   @override
   bool get isPotentiallyMutatedInClosure =>
       actualElement.isPotentiallyMutatedInClosure;
 
   @override
   bool get isPotentiallyMutatedInScope =>
       actualElement.isPotentiallyMutatedInScope;
 
   @override
-  VariableDeclaration get node => actualElement.node;
-
-  @override
   DartType get type => actualElement.type;
 }
 /**
  * TODO(scheglov) invalid implementation
  */
 class WeakReference<T> {
   final T value;
   WeakReference(this.value);
   T get() => value;
 }