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+(* A disjoint-names condition was missing when matching names in Ltac
+ pattern-matching *)
+
+Goal True.
+ let x := (eval cbv beta zeta in (fun P => let Q := P in fun P => P + Q)) in
+ unify x (fun a b => b + a); (* success *)
+ let x' := lazymatch x with
+ | (fun (a : ?A) (b : ?B) => ?k)
+ => constr:(fun (a : A) (b : B) => k)
+ end in
+ unify x x'.
+Abort.