Fix handling of default formal parameters in DeclarationResolver.

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

 // Copyright (c) 2016, 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.declaration_resolver;
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/dart/ast/visitor.dart';
 import 'package:analyzer/dart/element/element.dart';
@@ skipping 108 matching lines @@
   Object visitDefaultFormalParameter(DefaultFormalParameter node) {
     ParameterElement element =
         _match(node.parameter.identifier, _walker.getParameter());
     Expression defaultValue = node.defaultValue;
     if (defaultValue != null) {
       _walk(new ElementWalker.forExecutable(element.initializer), () {
         defaultValue.accept(this);
       });
     }
     _walk(new ElementWalker.forParameter(element), () {
-      super.visitDefaultFormalParameter(node);
+      node.parameter.accept(this);
     });
     _resolveMetadata(node, node.metadata, element);
     return null;
   }
 
   @override
   Object visitEnumDeclaration(EnumDeclaration node) {
     ClassElement element = _match(node.name, _walker.getEnum());
     _walk(new ElementWalker.forClass(element), () {
       for (EnumConstantDeclaration constant in node.constants) {
@@ skipping 493 matching lines @@
 class _ElementMismatchException extends AnalysisException {
   /**
    * Creates an exception to refer to the given [compilationUnit], [element],
    * and [cause].
    */
   _ElementMismatchException(
       CompilationUnitElement compilationUnit, Element element,
       [CaughtException cause = null])
       : super('Element mismatch in $compilationUnit at $element', cause);
 }