proposition: Lemma binds_one_3 : x = y -> a = b -> binds x a (one (VarAsn B y b)).
proof: Proof. clear. intros. red. simpl. left. congruence. Qed.
imports: Coq.FSets.FSets Coq.Lists.List Coq.Logic.Decidable Metalib.CoqFSetDecide Metalib.CoqListFacts Metalib.LibTactics Metalib.MetatheoryAtom Metalib.LibTactics