1 files changed, 30 insertions, 0 deletions
diff --git a/src/test/ui/overloaded/auxiliary/overloaded_autoderef_xc.rs b/src/test/ui/overloaded/auxiliary/overloaded_autoderef_xc.rs
new file mode 100644
index 000000000..112455f91
--- /dev/null
+++ b/src/test/ui/overloaded/auxiliary/overloaded_autoderef_xc.rs
@@ -0,0 +1,30 @@
+use std::ops::Deref;
+
+struct DerefWithHelper<H, T> {
+    pub helper: H,
+    pub value: Option<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()
+    }
+}
+
+// Test cross-crate autoderef + vtable.
+pub fn check<T: PartialEq>(x: T, y: T) -> bool {
+    let d: DerefWithHelper<Option<T>, T> = DerefWithHelper { helper: Some(x), value: None };
+    d.eq(&y)
+}