Fix for summarizing typedef typed parameters.

pkg/analyzer/lib/src/summary/summarize_elements.dart

 // Copyright (c) 2015, 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 serialization.elements;
 
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/type.dart';
 import 'package:analyzer/src/dart/element/element.dart';
 import 'package:analyzer/src/dart/element/member.dart';
@@ skipping 671 matching lines @@
     DartType type = parameter.type;
     if (parameter.hasImplicitType) {
       Element contextParent = context.enclosingElement;
       if (!parameter.isInitializingFormal &&
           contextParent is ExecutableElement &&
           !contextParent.isStatic &&
           contextParent is! ConstructorElement) {
         b.inferredTypeSlot = storeInferredType(type, context);
       }
     } else {
-      if (type is FunctionType) {
+      if (type is FunctionType && type.element.isSynthetic) {
         b.isFunctionTyped = true;
         b.type = serializeTypeRef(type.returnType, parameter);
         b.parameters = type.parameters
             .map((parameter) => serializeParam(parameter, context))
             .toList();
       } else {
         b.type = serializeTypeRef(type, context);
       }
     }
     if (parameter is ConstVariableElement) {
@@ skipping 660 matching lines @@
       exportNames.add(new LinkedExportNameBuilder(
           name: name,
           dependency: serializeDependency(dependentLibrary),
           unit: unit,
           kind: kind));
     }
     pb.exportNames = exportNames;
     return pb;
   }
 }