fact: Axiom binds_cons_1 : binds x a ((y, b) :: E) -> (x = y /\ a = b) \/ binds x a E.
imports: Coq.FSets.FSets Coq.Lists.List Coq.Logic.Decidable Metalib.CoqFSetDecide Metalib.CoqListFacts Metalib.AssocList Metalib.MetatheoryAtom Metalib.LibTactics