210     if (unlikely (!current)) return;  in end_serialize()
211     if (unlikely (in_error()))  in end_serialize()
234     if (unlikely (in_error ())) return start_embed<Type> ();  in push()
237     if (unlikely (!obj))  in push()
251     if (unlikely (!obj)) return;  in pop_discard()
252     if (unlikely (in_error())) return;  in pop_discard()
267     if (unlikely (!obj)) return 0;  in pop_pack()
268     if (unlikely (in_error())) return 0;  in pop_pack()
301     if (unlikely (!propagate_error (packed)))  in pop_pack()
320     if (unlikely (in_error ())) return;  in revert()
329     if (unlikely (in_error ())) return;  in revert()
339     if (unlikely (in_error ())) return;  in discard_stale_objects()
358     if (unlikely (in_error ())) return;  in add_link()
378     if (unlikely (in_error ())) return 0;  in to_bias()
387     if (unlikely (in_error ())) return;  in resolve_links()
396 	if (unlikely (!child)) { err (HB_SERIALIZE_ERROR_OTHER); return; }  in resolve_links()
425     if (unlikely (!current)) return 0;  in length()
451     if (unlikely (in_error ())) return nullptr;  in allocate_size()
473     if (unlikely (!ret)) return nullptr;  in embed()
489     if (unlikely (!ret)) return nullptr;  in _copy()
515     if (unlikely (in_error ())) return nullptr;  in extend_size()
520     if (unlikely (!this->allocate_size<Type> (((char *) obj) + size - this->head))) return nullptr;  in extend_size()
548     if (unlikely (!p)) return hb_bytes_t ();  in copy_bytes()