1 files changed, 20 insertions, 0 deletions
diff --git a/src/test/ui/type-alias-impl-trait/issue-74244.rs b/src/test/ui/type-alias-impl-trait/issue-74244.rs
new file mode 100644
index 000000000..bb4104b3d
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/issue-74244.rs
@@ -0,0 +1,20 @@
+#![feature(type_alias_impl_trait)]
+
+trait Allocator {
+    type Buffer;
+}
+
+struct DefaultAllocator;
+
+impl<T> Allocator for DefaultAllocator {
+    //~^ ERROR: the type parameter `T` is not constrained
+    type Buffer = ();
+}
+
+type A = impl Fn(<DefaultAllocator as Allocator>::Buffer);
+
+fn foo() -> A {
+    |_| ()
+}
+
+fn main() {}