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diff --git a/test-suite/bugs/closed/6529.v b/test-suite/bugs/closed/6529.v
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+Require Import Vector Program.
+
+Program Definition append_nil_def :=
+  forall A n (ls: t A n), append ls (nil A) = ls. (* Works *)
+
+Lemma append_nil : append_nil_def. (* Works *)
+Proof.
+Admitted.
+
+Program Lemma append_nil' :
+  forall A n (ls: t A n), append ls (nil A) = ls.
+Abort.
+
+Fail Program Lemma append_nil'' :
+  forall A B n (ls: t A n), append ls (nil A) = ls.
+(* Error: Anomaly "Evar ?X25 was not declared." Please report at http://coq.inria.fr/bugs/. *)