1 files changed, 19 insertions, 0 deletions
diff --git a/test/mono/varmatch.sail b/test/mono/varmatch.sail
new file mode 100644
index 00000000..7d2b9b73
--- /dev/null
+++ b/test/mono/varmatch.sail
@@ -0,0 +1,19 @@
+(* Check that when we case split on a variable that the constant propagation
+   handles the default case correctly. *)
+
+typedef AnEnum = enumerate { One; Two; Three }
+
+function AnEnum foo((AnEnum) x) = {
+  switch (x) {
+  case One -> Two
+  case y -> y
+  }
+}
+
+val unit -> bool effect pure run
+
+function run () = {
+  foo(One) == Two &
+  foo(Two) == Two &
+  foo(Three) == Three
+}