1 files changed, 39 insertions, 0 deletions
diff --git a/src/test/ui/overloaded/overloaded-autoderef-vtable.rs b/src/test/ui/overloaded/overloaded-autoderef-vtable.rs
new file mode 100644
index 000000000..f8e6d1208
--- /dev/null
+++ b/src/test/ui/overloaded/overloaded-autoderef-vtable.rs
@@ -0,0 +1,39 @@
+// run-pass
+#![allow(dead_code)]
+
+use std::ops::Deref;
+
+struct DerefWithHelper<H, T> {
+    helper: H,
+    value: T
+}
+
+trait Helper<T> {
+    fn helper_borrow(&self) -> &T;
+}
+
+impl<T> Helper<T> for Option<T> {
+    fn helper_borrow(&self) -> &T {
+        self.as_ref().unwrap()
+    }
+}
+
+impl<T, H: Helper<T>> Deref for DerefWithHelper<H, T> {
+    type Target = T;
+
+    fn deref(&self) -> &T {
+        self.helper.helper_borrow()
+    }
+}
+
+struct Foo {x: isize}
+
+impl Foo {
+    fn foo(&self) -> isize {self.x}
+}
+
+pub fn main() {
+    let x: DerefWithHelper<Option<Foo>, Foo> =
+        DerefWithHelper { helper: Some(Foo {x: 5}), value: Foo { x: 2 } };
+    assert_eq!(x.foo(), 5);
+}