(* Check pattern-unification on evars in apply unification *)

Axiom copy : forall tau:Type, tau -> tau -> Prop.
Axiom copyr : forall tau:Type, tau -> tau -> Prop.
Axiom copyf : forall tau:Type, tau -> tau -> Prop.
Axiom eq : forall tau:Type, tau -> tau -> Prop.
Axiom subst : forall tau tau':Type, (tau -> tau') -> tau -> tau' -> Prop.