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diff --git a/test-suite/bugs/closed/bug_12011.v b/test-suite/bugs/closed/bug_12011.v
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+From Coq Require Import Setoid ssreflect.
+
+Lemma test A (R : relation A) `{Equivalence _ R} (x y z : A) :
+  R x y -> R y z -> R x z.
+Proof.
+  intros Hxy Hyz.
+  rewrite -Hxy in Hyz.
+  exact Hyz.
+Qed.
+
+
+
+Axiom envs_lookup_delete : bool.
+Axiom envs_lookup_delete_Some : envs_lookup_delete = true <-> False.
+
+Goal envs_lookup_delete = true -> False.
+Proof.
+intros Hlookup.
+rewrite envs_lookup_delete_Some in Hlookup *. (* <- used to revert Hlookup *)
+exact Hlookup.
+Qed.