diff --git a/unison-src/tests/pattern-weirdness.u b/unison-src/tests/pattern-weirdness.u
new file mode 100644
index 000000000..32ac93ad9
--- /dev/null
+++ b/unison-src/tests/pattern-weirdness.u
@@ -0,0 +1,16 @@
+go =
+  a = 1
+  case "" of
+    pos | false  -> a
+    _            -> a
+
+> go
+
+-- 7 | > go
+--       ⧩
+--       ""
+
+-- should be 1, not ""
+
+-- seems to have something to do with the wildcard + guard, as changing or
+-- or deleting that line makes the problem go away
diff --git a/unison-src/tests/pattern-weirdness.ur b/unison-src/tests/pattern-weirdness.ur
new file mode 100644
index 000000000..d00491fd7
--- /dev/null
+++ b/unison-src/tests/pattern-weirdness.ur
@@ -0,0 +1 @@
+1