- reset 'dirty' flag to false after the libraries mirrors is computed, this ensures that we compute…

runtime/lib/mirrors_impl.dart

 // Copyright (c) 2012, 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.
 
 // VM-specific implementation of the dart:mirrors library.
 
 import "dart:collection" show UnmodifiableListView, UnmodifiableMapView;
 import "dart:async" show Future;
 
 var dirty = false;
@@ skipping 208 matching lines @@
 
 class _LocalMirrorSystem extends MirrorSystem {
   final TypeMirror dynamicType = new _SpecialTypeMirror('dynamic');
   final TypeMirror voidType = new _SpecialTypeMirror('void');
 
   var _libraries;
   Map<Uri, LibraryMirror> get libraries {
     if ((_libraries == null) || dirty) {
       _libraries = new Map<Uri, LibraryMirror>.fromIterable(
           _computeLibraries(), key: (e) => e.uri);
+      dirty = false;
     }
     return _libraries;
   }
   static _computeLibraries() native "MirrorSystem_libraries";
 
   var _isolate;
   IsolateMirror get isolate {
     if (_isolate == null) {
       _isolate = _computeIsolate();
     }
@@ skipping 1430 matching lines @@
     if (typeMirror == null) {
       typeMirror = makeLocalTypeMirror(key);
       _instantiationCache[key] = typeMirror;
       if (typeMirror is ClassMirror && !typeMirror._isGeneric) {
         _declarationCache[key] = typeMirror;
       }
     }
     return typeMirror;
   }
 }