Issue 21842. Fix incremental resolving of parameters of function typed parameters.

pkg/analyzer/lib/src/generated/incremental_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 engine.incremental_resolver;
 
 import 'dart:collection';
 import 'dart:math' as math;
 
 import 'ast.dart';
@@ skipping 668 matching lines @@
   static void _setParameterElements(FormalParameterList nodes,
       List<ParameterElement> elements) {
     if (nodes != null) {
       for (int i = 0; i < elements.length; i++) {
         ParameterElement element = elements[i];
         FormalParameter node = nodes.parameters[i];
         ParameterElement newElement = node.element;
         node.identifier.staticElement = element;
         (element as ElementImpl).name = newElement.name;
         (element as ElementImpl).nameOffset = newElement.nameOffset;
+        if (node is FunctionTypedFormalParameter) {
+          _setParameterElements(node.parameters, element.parameters);
+        }
       }
     }
   }
 }
 
 
 /**
  * Describes how declarations match an existing elements model.
  */
 class DeclarationMatchKind {
@@ skipping 1028 matching lines @@
   String toString() => name;
 }
 
 
 class _TokenPair {
   final _TokenDifferenceKind kind;
   final Token oldToken;
   final Token newToken;
   _TokenPair(this.kind, this.oldToken, this.newToken);
 }