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diff --git a/test-suite/bugs/closed/1551.v b/test-suite/bugs/closed/1551.v
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+Module Type S.
+  Parameter empty: Set.
+End S.
+
+Module D (M:S).
+  Import M.
+  Definition empty:=nat.
+End D.
+
+Module D' (M:S).
+  Import M.
+  Definition empty:Set. exact nat. Qed.
+End D'.