Check snapshots for feature compatibility.

runtime/vm/dart_api_impl.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.
 
 #include "include/dart_api.h"
 #include "include/dart_mirrors_api.h"
 #include "include/dart_native_api.h"
 
 #include "platform/assert.h"
 #include "lib/stacktrace.h"
@@ skipping 1138 matching lines @@
     Dart_EntropySource entropy_source,
     Dart_GetVMServiceAssetsArchive get_service_assets) {
   if (interrupt != NULL) {
     return strdup("Dart_Initialize: "
                   "Setting of interrupt callback is not supported.");
   }
   if (unhandled != NULL) {
     return strdup("Dart_Initialize: "
                   "Setting of unhandled exception callback is not supported.");
   }
-  const char* err_msg = Dart::InitOnce(vm_isolate_snapshot,
-                                       instructions_snapshot,
-                                       data_snapshot,
-                                       create, shutdown,
-                                       thread_exit,
-                                       file_open, file_read, file_write,
-                                       file_close, entropy_source,
-                                       get_service_assets);
-  if (err_msg != NULL) {
-    return strdup(err_msg);
-  }
-  return NULL;
+  return Dart::InitOnce(vm_isolate_snapshot,
+                        instructions_snapshot,
+                        data_snapshot,
+                        create, shutdown,
+                        thread_exit,
+                        file_open, file_read, file_write, file_close,
+                        entropy_source,
+                        get_service_assets);
 }
 
 
 DART_EXPORT char* Dart_Cleanup() {
   CHECK_NO_ISOLATE(Isolate::Current());
   const char* err_msg = Dart::Cleanup();
   if (err_msg != NULL) {
     return strdup(err_msg);
   }
   return NULL;
@@ skipping 5183 matching lines @@
 
 DART_EXPORT bool Dart_IsPrecompiledRuntime() {
 #if defined(DART_PRECOMPILED_RUNTIME)
   return true;
 #else
   return false;
 #endif
 }
 
 }  // namespace dart