Serialize erroneous element and more

pkg/compiler/lib/src/serialization/system.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 dart2js.serialization_system;
 
 import 'dart:async';
 import '../commandline_options.dart';
 import '../common.dart';
 import '../common/backend_api.dart';
@@ skipping 199 matching lines @@
 class ResolvedAstSerializerPlugin extends SerializerPlugin {
   final Resolution resolution;
   final SerializerPlugin nativeDataSerializer;
 
   ResolvedAstSerializerPlugin(this.resolution, this.nativeDataSerializer);
 
   @override
   void onElement(Element element, ObjectEncoder createEncoder(String tag)) {
     assert(invariant(element, element.isDeclaration,
         message: "Element $element must be the declaration"));
+    if (element.isError) return;
     if (element is MemberElement) {
       assert(invariant(element, resolution.hasResolvedAst(element),
           message: "Element $element must have a resolved ast"));
       ResolvedAst resolvedAst = resolution.getResolvedAst(element);
       ObjectEncoder objectEncoder = createEncoder(RESOLVED_AST_TAG);
       new ResolvedAstSerializer(
               objectEncoder, resolvedAst, nativeDataSerializer)
           .serialize();
     }
   }
@@ skipping 47 matching lines @@
   }
 
   @override
   void onElement(Element element, ObjectDecoder getDecoder(String tag)) {
     ObjectDecoder decoder = getDecoder(RESOLVED_AST_TAG);
     if (decoder != null) {
       _decoderMap[element] = decoder;
     }
   }
 }