1 files changed, 31 insertions, 0 deletions
diff --git a/tests/ui/nll/user-annotations/normalizing-user-annotation.rs b/tests/ui/nll/user-annotations/normalizing-user-annotation.rs
new file mode 100644
index 00000000000..fa8b3bfd577
--- /dev/null
+++ b/tests/ui/nll/user-annotations/normalizing-user-annotation.rs
@@ -0,0 +1,31 @@
+//@ check-pass
+//@ revisions: current next
+//@ ignore-compare-mode-next-solver (explicit revisions)
+//@[next] compile-flags: -Znext-solver
+
+// Regression test for <https://github.com/rust-lang/rust/issues/141708>.
+
+// See description in there; this has to do with fundamental limitations
+// to the old trait solver surrounding higher-ranked aliases with infer
+// vars. This always worked in the new trait solver, but I added a revision
+// just for good measure.
+
+trait Foo<'a> {
+    type Assoc;
+}
+
+impl Foo<'_> for i32 {
+    type Assoc = u32;
+}
+
+impl Foo<'_> for u32 {
+    type Assoc = u32;
+}
+
+fn foo<'b: 'b, T: for<'a> Foo<'a>, F: for<'a> Fn(<T as Foo<'a>>::Assoc)>(_: F) -> (T, F) {
+    todo!()
+}
+
+fn main() {
+    let (x, c): (i32, _) = foo::<'static, _, _>(|_| {});
+}