stack_check      3946 gc.c               return stack_check(STACKFRAME_FOR_CALL_CFUNC);
stack_check       343 vm_eval.c          stack_check(th);
stack_check       461 vm_eval.c          stack_check(th);
stack_check       486 vm_eval.c          stack_check(th);
stack_check       719 vm_eval.c          stack_check(th);