proposition: Lemma andbr_andb b1 b2 : andbr b1 b2 = andb b1 b2.
proof: Proof. destruct b1, b2; reflexivity. Qed.
imports: Coq.Strings.String Coq.Strings.Ascii Coq.Arith.Arith Coq.ZArith.BinInt Coq.NArith.BinNat Coq.Bool.Bool Coq.Classes.Morphisms Fiat.Common.Coq__8_4__8_5__Compat