1 files changed, 40 insertions, 0 deletions
diff --git a/src/test/ui/generic-associated-types/issue-88287.rs b/src/test/ui/generic-associated-types/issue-88287.rs
new file mode 100644
index 000000000..4952a0825
--- /dev/null
+++ b/src/test/ui/generic-associated-types/issue-88287.rs
@@ -0,0 +1,40 @@
+// edition:2018
+
+#![feature(generic_associated_types)]
+#![feature(type_alias_impl_trait)]
+
+use std::future::Future;
+
+trait SearchableResource<Criteria> {
+    type SearchResult;
+}
+
+trait SearchableResourceExt<Criteria>: SearchableResource<Criteria> {
+    type Future<'f, A: 'f + ?Sized, B: 'f>: Future<Output = Result<Vec<A::SearchResult>, ()>> + 'f
+    where
+        A: SearchableResource<B>,
+        Self: 'f;
+
+    fn search<'c>(&'c self, client: &'c ()) -> Self::Future<'c, Self, Criteria>;
+}
+
+type SearchFutureTy<'f, A, B: 'f>
+where
+    A: SearchableResource<B> + ?Sized + 'f,
+= impl Future<Output = Result<Vec<A::SearchResult>, ()>> + 'f;
+impl<T, Criteria> SearchableResourceExt<Criteria> for T
+where
+    T: SearchableResource<Criteria>,
+{
+    type Future<'f, A, B: 'f> = SearchFutureTy<'f, A, B>
+    where
+        A: SearchableResource<B> + ?Sized + 'f,
+        Self: 'f;
+
+    fn search<'c>(&'c self, _client: &'c ()) -> Self::Future<'c, Self, Criteria> {
+        async move { todo!() }
+        //~^ ERROR: the size for values of type `A` cannot be known at compilation time
+    }
+}
+
+fn main() {}