1 files changed, 26 insertions, 0 deletions
diff --git a/src/test/ui/specialization/default-generic-associated-type-bound.rs b/src/test/ui/specialization/default-generic-associated-type-bound.rs
new file mode 100644
index 000000000..0f5714e99
--- /dev/null
+++ b/src/test/ui/specialization/default-generic-associated-type-bound.rs
@@ -0,0 +1,26 @@
+// Check that default generics associated types are validated.
+
+#![feature(specialization)]
+#![feature(generic_associated_types)]
+//~^^ WARNING `specialization` is incomplete
+
+trait X {
+    type U<'a>: PartialEq<&'a Self> where Self: 'a;
+    fn unsafe_compare<'b>(x: Option<Self::U<'b>>, y: Option<&'b Self>) {
+        match (x, y) {
+            (Some(a), Some(b)) => a == b,
+            _ => false,
+        };
+    }
+}
+
+impl<T: 'static> X for T {
+    default type U<'a> = &'a T;
+    //~^ ERROR can't compare `T` with `T`
+}
+
+struct NotComparable;
+
+pub fn main() {
+    <NotComparable as X>::unsafe_compare(None, None);
+}