Fix for issue 19817

runtime/bin/dartutils.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 "bin/dartutils.h"
 
 #include "include/dart_api.h"
 #include "include/dart_native_api.h"
 
 #include "platform/assert.h"
@@ skipping 781 matching lines @@
                                      NewString("_printClosure"),
                                      print);
   DART_CHECK_VALID(result);
 
   // Setup the 'timer' factory.
   url = NewString(kAsyncLibURL);
   DART_CHECK_VALID(url);
   Dart_Handle async_lib = Dart_LookupLibrary(url);
   DART_CHECK_VALID(async_lib);
   Dart_Handle io_lib = Builtin::LoadAndCheckLibrary(Builtin::kIOLibrary);
+
+  // We need to ensure that all the scripts loaded so far are finalized
+  // as we are about to invoke some Dart code below to setup closures.
+  result = Dart_FinalizeLoading(false);
+  DART_CHECK_VALID(result);
+
   Dart_Handle timer_closure =
       Dart_Invoke(io_lib, NewString("_getTimerFactoryClosure"), 0, NULL);
   Dart_Handle args[1];
   args[0] = timer_closure;
   DART_CHECK_VALID(Dart_Invoke(
       async_lib, NewString("_setTimerFactoryClosure"), 1, args));
 
   // Setup the 'scheduleImmediate' closure.
   url = NewString(kIsolateLibURL);
   DART_CHECK_VALID(url);
@@ skipping 341 matching lines @@
       new CObjectString(CObject::NewString(os_error->message()));
   CObjectArray* result = new CObjectArray(CObject::NewArray(3));
   result->SetAt(0, new CObjectInt32(CObject::NewInt32(kOSError)));
   result->SetAt(1, new CObjectInt32(CObject::NewInt32(os_error->code())));
   result->SetAt(2, error_message);
   return result;
 }
 
 }  // namespace bin
 }  // namespace dart