1 files changed, 20 insertions, 0 deletions
diff --git a/tests/open.ur b/tests/open.ur
new file mode 100644
index 0000000..47f8121
--- /dev/null
+++ b/tests/open.ur
@@ -0,0 +1,20 @@
+structure S = struct
+        type t = int
+        val x = 0
+
+        structure S' : sig type u val y : t end = struct
+                type u = t
+                val y = x
+        end
+
+        signature Sig = sig
+                type t
+                val x : t
+        end
+end
+
+open S.S'
+open S
+open S'
+
+structure S' : Sig = S