Closed generator returns a completed object instead of throwing a error

src/runtime.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 3098 matching lines @@
   ASSERT(args.length() == 3);
   CONVERT_ARG_CHECKED(JSGeneratorObject, generator_object, 0);
   CONVERT_ARG_CHECKED(Object, value, 1);
   CONVERT_SMI_ARG_CHECKED(resume_mode_int, 2);
   JavaScriptFrameIterator stack_iterator(isolate);
   JavaScriptFrame* frame = stack_iterator.frame();
 
   ASSERT_EQ(frame->function(), generator_object->function());
   ASSERT(frame->function()->is_compiled());
 
-  STATIC_ASSERT(JSGeneratorObject::kGeneratorExecuting <= 0);
-  STATIC_ASSERT(JSGeneratorObject::kGeneratorClosed <= 0);
+  STATIC_ASSERT(JSGeneratorObject::kGeneratorExecuting < 0);
+  STATIC_ASSERT(JSGeneratorObject::kGeneratorClosed == 0);
 
   Address pc = generator_object->function()->code()->instruction_start();
   int offset = generator_object->continuation();
   ASSERT(offset > 0);
   frame->set_pc(pc + offset);
   generator_object->set_continuation(JSGeneratorObject::kGeneratorExecuting);
 
   FixedArray* operand_stack = generator_object->operand_stack();
   int operands_count = operand_stack->length();
   if (operands_count != 0) {
@@ skipping 11753 matching lines @@
     // Handle last resort GC and make sure to allow future allocations
     // to grow the heap without causing GCs (if possible).
     isolate->counters()->gc_last_resort_from_js()->Increment();
     isolate->heap()->CollectAllGarbage(Heap::kNoGCFlags,
                                        "Runtime::PerformGC");
   }
 }
 
 
 } }  // namespace v8::internal