1 files changed, 32 insertions, 0 deletions
diff --git a/src/test/ui/specialization/specialization-translate-projections-with-params.rs b/src/test/ui/specialization/specialization-translate-projections-with-params.rs
new file mode 100644
index 000000000..62d63590a
--- /dev/null
+++ b/src/test/ui/specialization/specialization-translate-projections-with-params.rs
@@ -0,0 +1,32 @@
+// run-pass
+
+// Ensure that provided items are inherited properly even when impls vary in
+// type parameters *and* rely on projections, and the type parameters are input
+// types on the trait.
+
+#![feature(specialization)] //~ WARN the feature `specialization` is incomplete
+
+trait Trait<T> {
+    fn convert(&self) -> T;
+}
+trait WithAssoc {
+    type Item;
+    fn as_item(&self) -> &Self::Item;
+}
+
+impl<T, U> Trait<U> for T where T: WithAssoc<Item=U>, U: Clone {
+    fn convert(&self) -> U {
+        self.as_item().clone()
+    }
+}
+
+impl WithAssoc for u8 {
+    type Item = u8;
+    fn as_item(&self) -> &u8 { self }
+}
+
+impl Trait<u8> for u8 {}
+
+fn main() {
+    assert!(3u8.convert() == 3u8);
+}