Add a regression test for issue-65581

Author: JohnTitor

src/test/ui/impl-trait/issues/issue-65581.rs

@@ -0,0 +1,33 @@
+// check-pass
+
+#![allow(dead_code)]
+
+trait Trait1<T, U> {
+    fn f1(self) -> U;
+}
+
+trait Trait2 {
+    type T;
+    type U: Trait2<T = Self::T>;
+    fn f2(f: impl FnOnce(&Self::U));
+}
+
+fn f3<T: Trait2>() -> impl Trait1<T, T::T> {
+    Struct1
+}
+
+struct Struct1;
+
+impl<T: Trait2> Trait1<T, T::T> for Struct1 {
+    fn f1(self) -> T::T {
+        unimplemented!()
+    }
+}
+
+fn f4<T: Trait2>() {
+    T::f2(|_| {
+        f3::<T::U>().f1();
+    });
+}
+
+fn main() {}