Fix for the libraries to parts map.

pkg/analyzer/lib/src/task/dart_work_manager.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 analyzer.src.task.dart_work_manager;
 
 import 'dart:collection';
 
 import 'package:analyzer/src/context/cache.dart';
 import 'package:analyzer/src/generated/engine.dart'
@@ skipping 247 matching lines @@
   /**
    * Notifies the manager about [SourceFactory] changes.
    */
   void onSourceFactoryChanged() {
     _invalidateAllLocalResolutionInformation(true);
   }
 
   @override
   void resultsComputed(
       AnalysisTarget target, Map<ResultDescriptor, dynamic> outputs) {
+    bool isDartSource = _isDartSource(target);
     // Organize sources.
-    if (_isDartSource(target)) {
+    bool isDartLibrarySource = false;
+    if (isDartSource) {
       Source source = target;
       SourceKind kind = outputs[SOURCE_KIND];
       if (kind != null) {
         unknownSourceQueue.remove(source);
         if (kind == SourceKind.LIBRARY) {
+          isDartLibrarySource = true;
           if (context.prioritySources.contains(source)) {
             _schedulePriorityLibrarySourceAnalysis(source);
           } else {
             bool needErrors = _shouldErrorsBeComputed(source);
             if (needErrors) {
               librarySourceQueue.add(target);
             }
           }
         }
       }
     }
     // Update parts in libraries.
-    if (_isDartSource(target)) {
+    if (isDartLibrarySource) {
       Source library = target;
       List<Source> includedParts = outputs[INCLUDED_PARTS];
       if (includedParts != null) {
         libraryPartsMap[library] = includedParts;
         for (Source part in includedParts) {
           List<Source> libraries =
               partLibrariesMap.putIfAbsent(part, () => <Source>[]);
           if (!libraries.contains(library)) {
             libraries.add(library);
             _invalidateContainingLibraries(part);
           }
         }
       }
     }
     // Update notice.
-    if (_isDartSource(target)) {
+    if (isDartSource) {
       bool shouldSetErrors = false;
       outputs.forEach((ResultDescriptor descriptor, value) {
         if (descriptor == PARSED_UNIT && value != null) {
           context.getNotice(target).parsedDartUnit = value;
           shouldSetErrors = true;
         }
         if (descriptor == DART_ERRORS) {
           shouldSetErrors = true;
         }
       });
@@ skipping 120 matching lines @@
     }
   }
 
   bool _shouldErrorsBeComputed(Source source) =>
       context.shouldErrorsBeAnalyzed(source, null);
 
   static bool _isDartSource(AnalysisTarget target) {
     return target is Source && AnalysisEngine.isDartFileName(target.fullName);
   }
 }