1 files changed, 39 insertions, 0 deletions
diff --git a/src/test/ui/traits/superdefault-generics.rs b/src/test/ui/traits/superdefault-generics.rs
new file mode 100644
index 000000000..e862c0e97
--- /dev/null
+++ b/src/test/ui/traits/superdefault-generics.rs
@@ -0,0 +1,39 @@
+// run-pass
+#![allow(dead_code)]
+#![allow(non_snake_case)]
+
+// There is some other borrowck bug, so we make the stuff not mut.
+
+
+use std::ops::Add;
+
+trait Positioned<S> {
+  fn SetX(&mut self, _: S);
+  fn X(&self) -> S;
+}
+
+trait Movable<S: Add<Output=S>>: Positioned<S> {
+  fn translate(&mut self, dx: S) {
+    let x = self.X() + dx;
+    self.SetX(x);
+  }
+}
+
+struct Point<S> { x: S, y: S }
+
+impl<S: Clone> Positioned<S> for Point<S> {
+    fn SetX(&mut self, x: S) {
+        self.x = x;
+    }
+    fn X(&self) -> S {
+        self.x.clone()
+    }
+}
+
+impl<S: Clone + Add<Output=S>> Movable<S> for Point<S> {}
+
+pub fn main() {
+    let mut p = Point{ x: 1, y: 2};
+    p.translate(3);
+    assert_eq!(p.X(), 4);
+}