Resynthesize typedefs from Kernel.

pkg/analyzer/test/src/summary/resynthesize_common.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 test.src.serialization.elements_test;
 
 import 'dart:async';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/standard_resolution_map.dart';
@@ skipping 9422 matching lines @@
 ''');
   }
 
   test_typedef_parameters() async {
     var library = await checkLibrary('typedef F(x, y);');
     checkElementText(library, r'''
 typedef dynamic F(dynamic x, dynamic y);
 ''');
   }
 
+  test_typedef_parameters_named() async {
+    var library = await checkLibrary('typedef F({y, z, x});');
+    checkElementText(library, r'''
+typedef dynamic F({dynamic y}, {dynamic z}, {dynamic x});
+''');
+  }
+
   test_typedef_return_type() async {
     var library = await checkLibrary('typedef int F();');
     checkElementText(library, r'''
 typedef int F();
 ''');
   }
 
   test_typedef_return_type_generic() async {
     var library = await checkLibrary('typedef T F<T>();');
     checkElementText(library, r'''
@@ skipping 609 matching lines @@
       fail('Unexpectedly tried to get unlinked summary for $uri');
     }
     return serializedUnit;
   }
 
   @override
   bool hasLibrarySummary(String uri) {
     return true;
   }
 }