proposition: Lemma string_lb {x y} : x = y -> string_beq x y = true.
proof: Proof. apply internal_string_dec_lb. Qed.
imports: Coq.Lists.List Coq.Lists.SetoidList Coq.Bool.Bool Coq.Arith.PeanoNat Coq.Strings.Ascii Coq.Strings.String Coq.Logic.Eqdep_dec Fiat.Common