proposition: Lemma hlist_gen_member_hlist_gen : forall ls, hlist_gen_member (fun a _ => f a) = hlist_gen ls.
proof: Proof. induction ls; simpl; f_equal; auto. Qed.
imports: Coq.Lists.List Coq.Arith.PeanoNat Relations RelationClasses ExtLib.Core.RelDec ExtLib.Data.SigT ExtLib.Data.Member ExtLib.Data.ListNth ExtLib.Data.Option ExtLib.Tactics Coq.Classes.Morphisms