1 files changed, 19 insertions, 0 deletions

diff --git a/src/test/ui/issues/issue-11267.rs b/src/test/ui/issues/issue-11267.rs
new file mode 100644
index 000000000..848ed6ac7
--- /dev/null
+++ b/src/test/ui/issues/issue-11267.rs
@@ -0,0 +1,19 @@
+// run-pass
+// Tests that unary structs can be mutably borrowed.
+
+struct Empty;
+
+trait T<U> {
+    fn next(&mut self) -> Option<U>;
+}
+impl T<isize> for Empty {
+    fn next(&mut self) -> Option<isize> { None }
+}
+
+fn do_something_with(a : &mut dyn T<isize>) {
+    println!("{:?}", a.next())
+}
+
+pub fn main() {
+    do_something_with(&mut Empty);
+}