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diff --git a/test-suite/bugs/closed/shouldsucceed/1891.v b/test-suite/bugs/closed/shouldsucceed/1891.v
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+++ b/test-suite/bugs/closed/shouldsucceed/1891.v
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+(* Check evar-evar unification *)
+ Inductive T (A: Set): Set := mkT: unit -> T A.
+
+  Definition f (A: Set) (l: T A): unit := tt.
+
+  Implicit Arguments f [A].
+
+  Lemma L (x: T unit): (unit -> T unit) -> unit.
+  Proof.
+    refine (fun x => match x return _ with mkT n => fun g => f (g _) end).
+    trivial.
+  Qed.
+