vm_cref_push       19 vm_eval.c      static NODE *vm_cref_push(rb_thread_t *th, VALUE klass, int noex);
vm_cref_push      912 vm_eval.c          NODE *cref = vm_cref_push(th, under, NOEX_PUBLIC);
vm_cref_push      932 vm_eval.c          NODE *cref = vm_cref_push(GET_THREAD(), under, NOEX_PUBLIC);