fact: Definition maps (A : Type) (x : atom) (a : A) (E : list (atom*A)) : Prop := get x E = Some a.
imports: Coq.FSets.FSets Coq.Lists.List Coq.Logic.Decidable Metalib.CoqFSetDecide Metalib.CoqListFacts Metalib.AssocList Metalib.MetatheoryAtom Metalib.LibTactics