1 files changed, 24 insertions, 0 deletions
diff --git a/src/test/ui/specialization/issue-38091.rs b/src/test/ui/specialization/issue-38091.rs
new file mode 100644
index 000000000..5b398368a
--- /dev/null
+++ b/src/test/ui/specialization/issue-38091.rs
@@ -0,0 +1,24 @@
+#![feature(specialization)]
+//~^ WARN the feature `specialization` is incomplete
+
+trait Iterate<'a> {
+    type Ty: Valid;
+    fn iterate(self);
+}
+impl<'a, T> Iterate<'a> for T
+where
+    T: Check,
+{
+    default type Ty = ();
+    //~^ ERROR the trait bound `(): Valid` is not satisfied
+    default fn iterate(self) {}
+}
+
+trait Check {}
+impl<'a, T> Check for T where <T as Iterate<'a>>::Ty: Valid {}
+
+trait Valid {}
+
+fn main() {
+    Iterate::iterate(0);
+}