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diff --git a/test-suite/bugs/closed/5066.v b/test-suite/bugs/closed/5066.v
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+++ b/test-suite/bugs/closed/5066.v
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+Require Import Vector.
+
+Fail Program Fixpoint vector_rev {A : Type} {n1 n2 : nat} (v1 : Vector.t A n1) (v2 : Vector.t A n2) : Vector.t A (n1+n2) :=
+  match v1 with
+  | nil _          => v2
+  | cons _ e n' sv => vector_rev sv (cons A e n2 v2)
+  end.