fact: Definition option_code (x y : option A) : Prop := match x, y with | Some x', Some y' => x' = y' | None, None => True | _, _ => False end.
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