1 files changed, 25 insertions, 0 deletions
diff --git a/src/test/ui/on-unimplemented/on-impl.rs b/src/test/ui/on-unimplemented/on-impl.rs
new file mode 100644
index 000000000..ab3e67d01
--- /dev/null
+++ b/src/test/ui/on-unimplemented/on-impl.rs
@@ -0,0 +1,25 @@
+// Test if the on_unimplemented message override works
+
+#![feature(rustc_attrs)]
+
+
+#[rustc_on_unimplemented = "invalid"]
+trait Index<Idx: ?Sized> {
+    type Output: ?Sized;
+    fn index(&self, index: Idx) -> &Self::Output;
+}
+
+#[rustc_on_unimplemented = "a usize is required to index into a slice"]
+impl Index<usize> for [i32] {
+    type Output = i32;
+    fn index(&self, index: usize) -> &i32 {
+        &self[index]
+    }
+}
+
+
+fn main() {
+    Index::<u32>::index(&[1, 2, 3] as &[i32], 2u32);
+    //~^ ERROR E0277
+    //~| ERROR E0277
+}