Definition memE := mem_simpl.(* Qualifiers and keyed predicates. *)

Variant qualifier (q : nat) T := Qualifier of predPredType T.(* Qualifiers and keyed predicates. *)

Variant qualifier (q : nat) T := Qualifier of predPredType T.

(* Specifications: *)
Lemma qualifE n T p x : (x \in @Qualifier n T p) = p x.