1 files changed, 16 insertions, 0 deletions
diff --git a/tests/case.ur b/tests/case.ur
new file mode 100644
index 00000000..b131b27b
--- /dev/null
+++ b/tests/case.ur
@@ -0,0 +1,16 @@
+datatype t = A | B
+
+val swap = fn x : t => case x of A => B | B => A
+
+datatype u = C of t | D
+
+val out = fn x : u => case x of C y => y | D => A
+
+datatype nat = O | S of nat
+
+val is_two = fn x : nat =>
+        case x of S (S O) => A | _ => B
+
+val zero_is_two = is_two O
+val one_is_two = is_two (S O)
+val two_is_two = is_two (S (S O))