1 files changed, 25 insertions, 0 deletions
diff --git a/src/test/ui/type-alias-impl-trait/issue-78450.rs b/src/test/ui/type-alias-impl-trait/issue-78450.rs
new file mode 100644
index 000000000..fccbfb74f
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/issue-78450.rs
@@ -0,0 +1,25 @@
+// check-pass
+
+#![feature(type_alias_impl_trait)]
+
+pub trait AssociatedImpl {
+    type ImplTrait;
+
+    fn f() -> Self::ImplTrait;
+}
+
+struct S<T>(T);
+
+trait Associated {
+    type A;
+}
+
+impl<'a, T: Associated<A = &'a ()>> AssociatedImpl for S<T> {
+    type ImplTrait = impl core::fmt::Debug;
+
+    fn f() -> Self::ImplTrait {
+        ()
+    }
+}
+
+fn main() {}