rb_digest_instance_method_unimpl  174 ext/digest/digest.c     rb_digest_instance_method_unimpl(self, "update");
rb_digest_instance_method_unimpl  194 ext/digest/digest.c     rb_digest_instance_method_unimpl(self, "finish");
rb_digest_instance_method_unimpl  210 ext/digest/digest.c     rb_digest_instance_method_unimpl(self, "reset");
rb_digest_instance_method_unimpl  436 ext/digest/digest.c     rb_digest_instance_method_unimpl(self, "block_length");