proposition: Lemma toNat_joinmsb0 n (p: BITS n) : toNat (joinmsb0 p) = toNat p.
proof: Proof. by rewrite toNat_joinmsb. Qed.
imports: Coq(ZArith.ZArith) mathcomp.ssreflect.ssreflect mathcomp(ssrfun ssrbool eqtype ssrnat seq fintype tuple div zmodp ssralg) ssrextra.nat ssrextra.tuple spec.spec