Fix for issue 19817

runtime/bin/gen_snapshot.cc

 // Copyright (c) 2013, 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.
 
 // Generate a snapshot file after loading all the scripts specified on the
 // command line.
 
 #include <stdlib.h>
 #include <string.h>
 #include <stdio.h>
@@ skipping 450 matching lines @@
       LoadGenericSnapshotCreationScript(Builtin::kBuiltinLibrary);
   VerifyLoaded(library);
 }
 
 
 static void SetupForGenericSnapshotCreation() {
   SetupForUriResolution();
 
   Dart_Handle library = LoadGenericSnapshotCreationScript(Builtin::kIOLibrary);
   VerifyLoaded(library);
+  Dart_Handle result = Dart_FinalizeLoading(false);
+  if (Dart_IsError(result)) {
+    const char* err_msg = Dart_GetError(library);
+    Log::PrintErr("Errors encountered while loading: %s\n", err_msg);
+    Dart_ExitScope();
+    Dart_ShutdownIsolate();
+    exit(255);
+  }
 }
 
 
 int main(int argc, char** argv) {
   CommandLineOptions vm_options(argc);
 
   // Initialize the URL mapping array.
   CommandLineOptions url_mapping_array(argc);
   url_mapping = &url_mapping_array;
 
@@ skipping 85 matching lines @@
   }
   return 0;
 }
 
 }  // namespace bin
 }  // namespace dart
 
 int main(int argc, char** argv) {
   return dart::bin::main(argc, argv);
 }