proposition: Lemma In_lastkey V k v (h : natmap V) : (k, v) \In h -> k <= last_key h.
proof: Proof. by move/In_dom/lastkey_max. Qed.
imports: Coq(ssreflect ssrbool ssrfun) mathcomp(ssrnat eqtype seq path interval) pcm(options prelude pred finmap rtc seqext useqord uslice uconsec)