1 files changed, 11 insertions, 0 deletions
diff --git a/src/test/ui/traits/default-method/mut.rs b/src/test/ui/traits/default-method/mut.rs
new file mode 100644
index 000000000..5f8e983b0
--- /dev/null
+++ b/src/test/ui/traits/default-method/mut.rs
@@ -0,0 +1,11 @@
+// run-pass
+#![allow(unused_assignments)]
+// pretty-expanded FIXME #23616
+
+#![allow(unused_variables)]
+
+trait Foo {
+    fn foo(&self, mut v: isize) { v = 1; }
+}
+
+pub fn main() {}