fact: Axiom binds_dom_contradiction : forall (E : list (atom*A)), binds x a E -> ~ In x (dom E) -> False.
imports: Coq.FSets.FSets Coq.Lists.List Coq.Logic.Decidable Metalib.CoqFSetDecide Metalib.CoqListFacts Metalib.AssocList Metalib.MetatheoryAtom Metalib.LibTactics