Fix for crash because of missing type of default generic function typed parameters.

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 111 matching lines @@
     return null;
   }
 
   @override
   Object visitDefaultFormalParameter(DefaultFormalParameter node) {
     NormalFormalParameter normalParameter = node.parameter;
     ParameterElement element =
         _match(normalParameter.identifier, _walker.getParameter());
     if (normalParameter is SimpleFormalParameterImpl) {
       normalParameter.element = element;
+      _setGenericFunctionType(normalParameter.type, element.type);
     }
     Expression defaultValue = node.defaultValue;
     if (defaultValue != null) {
       _walk(
           new ElementWalker.forExecutable(element.initializer, _enclosingUnit),
           () {
         defaultValue.accept(this);
       });
     }
     _walk(new ElementWalker.forParameter(element), () {
@@ skipping 672 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);
 }