1 files changed, 28 insertions, 0 deletions
diff --git a/tests/ui/mir/mir_autoderef.rs b/tests/ui/mir/mir_autoderef.rs
new file mode 100644
index 000000000..a0e615a73
--- /dev/null
+++ b/tests/ui/mir/mir_autoderef.rs
@@ -0,0 +1,28 @@
+// run-pass
+use std::ops::{Deref, DerefMut};
+
+pub struct MyRef(u32);
+
+impl Deref for MyRef {
+    type Target = u32;
+    fn deref(&self) -> &u32 { &self.0 }
+}
+
+impl DerefMut for MyRef {
+    fn deref_mut(&mut self) -> &mut u32 { &mut self.0 }
+}
+
+
+fn deref(x: &MyRef) -> &u32 {
+    x
+}
+
+fn deref_mut(x: &mut MyRef) -> &mut u32 {
+    x
+}
+
+fn main() {
+    let mut r = MyRef(2);
+    assert_eq!(deref(&r) as *const _, &r.0 as *const _);
+    assert_eq!(deref_mut(&mut r) as *mut _, &mut r.0 as *mut _);
+}