Fix for summarization of generic function type aliases and support for resynthesizing.

pkg/analyzer/lib/src/summary/summarize_ast.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 serialization.summarize_ast;
 
 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/type.dart' show DartType;
@@ skipping 781 matching lines @@
   }
 
   /**
    * Serialize a generic function type.
    */
   EntityRefBuilder serializeGenericFunctionType(GenericFunctionType node) {
     _TypeParameterScope typeParameterScope = new _TypeParameterScope();
     scopes.add(typeParameterScope);
     EntityRefBuilder b = new EntityRefBuilder();
     b.entityKind = EntityRefKind.genericFunctionType;
+    b.typeParameters =
+        serializeTypeParameters(node.typeParameters, typeParameterScope);
     b.syntheticReturnType = node.returnType == null
         ? serializeDynamic()
         : serializeTypeName(node.returnType);
-    b.typeParameters =
-        serializeTypeParameters(node.typeParameters, typeParameterScope);
     b.syntheticParams = node.parameters.parameters
         .map((FormalParameter p) => p.accept(this) as UnlinkedParamBuilder)
         .toList();
     scopes.removeLast();
     return b;
   }
 
   /**
    * If the given [expression] is not `null`, serialize it as an
    * [UnlinkedExecutableBuilder], otherwise return `null`.
@@ skipping 669 matching lines @@
 /**
  * A [_TypeParameterScope] is a [_Scope] which defines [_ScopedTypeParameter]s.
  */
 class _TypeParameterScope extends _Scope {
   /**
    * Get the number of [_ScopedTypeParameter]s defined in this
    * [_TypeParameterScope].
    */
   int get length => _definedNames.length;
 }