- Properly setup an Api scope before calling out through the API.

runtime/vm/object.cc

 // 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.
 
 #include "vm/object.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/cpu.h"
@@ skipping 9786 matching lines @@
   // loading. Once all outstanding load requests have completed, the embedder
   // will call the core library to:
   // - invalidate dependent code of this prefix;
   // - mark this prefixes as loaded;
   // - complete the future associated with this prefix.
   const Library& deferred_lib = Library::Handle(GetLibrary(0));
   if (deferred_lib.Loaded()) {
     this->set_is_loaded();
     return true;
   } else if (deferred_lib.LoadNotStarted()) {
+    Isolate* isolate = Isolate::Current();
+    Api::Scope api_scope(isolate);
     deferred_lib.SetLoadRequested();
-    Isolate* isolate = Isolate::Current();
     const String& lib_url = String::Handle(isolate, deferred_lib.url());
     Dart_LibraryTagHandler handler = isolate->library_tag_handler();
     handler(Dart_kImportTag,
             Api::NewHandle(isolate, importer()),
             Api::NewHandle(isolate, lib_url.raw()));
   } else {
     // Another load request is in flight.
     ASSERT(deferred_lib.LoadRequested());
   }
   return false;  // Load request not yet completed.
@@ skipping 9345 matching lines @@
   return tag_label.ToCString();
 }
 
 
 void UserTag::PrintJSONImpl(JSONStream* stream, bool ref) const {
   Instance::PrintJSONImpl(stream, ref);
 }
 
 
 }  // namespace dart