1 files changed, 37 insertions, 0 deletions
diff --git a/src/test/ui/generic-associated-types/issue-89008.rs b/src/test/ui/generic-associated-types/issue-89008.rs
new file mode 100644
index 000000000..669dbafb5
--- /dev/null
+++ b/src/test/ui/generic-associated-types/issue-89008.rs
@@ -0,0 +1,37 @@
+// check-pass
+// edition:2021
+
+#![feature(type_alias_impl_trait)]
+
+use std::future::Future;
+use std::marker::PhantomData;
+
+trait Stream {
+    type Item;
+}
+
+struct Empty<T> {
+    _phantom: PhantomData<T>,
+}
+
+impl<T> Stream for Empty<T> {
+    type Item = T;
+}
+
+trait X {
+    type LineStream<'a, Repr>: Stream<Item = Repr> where Self: 'a;
+    type LineStreamFut<'a, Repr>: Future<Output = Self::LineStream<'a, Repr>> where Self: 'a;
+    fn line_stream<'a, Repr>(&'a self) -> Self::LineStreamFut<'a, Repr>;
+}
+
+struct Y;
+
+impl X for Y {
+    type LineStream<'a, Repr> = impl Stream<Item = Repr>;
+    type LineStreamFut<'a, Repr> = impl Future<Output = Self::LineStream<'a, Repr>>;
+    fn line_stream<'a, Repr>(&'a self) -> Self::LineStreamFut<'a, Repr> {
+        async { Empty { _phantom: PhantomData } }
+    }
+}
+
+fn main() {}