1 files changed, 16 insertions, 0 deletions
diff --git a/tests/ui/pattern/usefulness/match-ref-ice.rs b/tests/ui/pattern/usefulness/match-ref-ice.rs
new file mode 100644
index 000000000..dee110f96
--- /dev/null
+++ b/tests/ui/pattern/usefulness/match-ref-ice.rs
@@ -0,0 +1,16 @@
+#![deny(unreachable_patterns)]
+
+// The arity of `ref x` is always 1. If the pattern is compared to some non-structural type whose
+// arity is always 0, an ICE occurs.
+//
+// Related issue: #23009
+
+fn main() {
+    let homura = [1, 2, 3];
+
+    match homura {
+        [1, ref _madoka, 3] => (),
+        [1, 2, 3] => (), //~ ERROR unreachable pattern
+        [_, _, _] => (),
+    }
+}