proposition: Lemma findall_nilp p s : nilp (findall p s) = ~~ has p s.
proof: Proof. by rewrite /nilp findall_size has_count -leqNgt leqn0. Qed.
imports: Coq(ssreflect ssrbool ssrfun) mathcomp(ssrnat seq path eqtype choice bigop) pcm(options prelude pred)