1 files changed, 15 insertions, 0 deletions
diff --git a/tests/ui/inference/lub-glb-with-unbound-infer-var.rs b/tests/ui/inference/lub-glb-with-unbound-infer-var.rs
new file mode 100644
index 000000000..c9e117089
--- /dev/null
+++ b/tests/ui/inference/lub-glb-with-unbound-infer-var.rs
@@ -0,0 +1,15 @@
+// run-pass
+// Test for a specific corner case: when we compute the LUB of two fn
+// types and their parameters have unbound variables. In that case, we
+// wind up relating those two variables. This was causing an ICE in an
+// in-progress PR.
+
+fn main() {
+    let a_f: fn(_) = |_| ();
+    let b_f: fn(_) = |_| ();
+    let c_f = match 22 {
+        0 => a_f,
+        _ => b_f,
+    };
+    c_f(4);
+}