fact: Parameter vrf_dealloc : forall x A (v : A) j (Q : post unit), (x \notin dom j -> valid j -> Q (Val tt) j) -> vrf (x :-> v \+ j) (dealloc x) Q.
imports: mathcomp(ssreflect ssrbool ssrfun ssrnat eqtype seq) pcm(options axioms pred prelude) pcm(pcm unionmap heap) htt(domain)