1 files changed, 18 insertions, 0 deletions
diff --git a/tests/ui/traits/new-solver/escaping-bound-vars-in-writeback-normalization.rs b/tests/ui/traits/new-solver/escaping-bound-vars-in-writeback-normalization.rs
new file mode 100644
index 00000000000..29784c32a1b
--- /dev/null
+++ b/tests/ui/traits/new-solver/escaping-bound-vars-in-writeback-normalization.rs
@@ -0,0 +1,18 @@
+// compile-flags: -Ztrait-solver=next
+// check-pass
+
+trait Trivial {
+    type Assoc;
+}
+
+impl<T: ?Sized> Trivial for T {
+    type Assoc = ();
+}
+
+fn main() {
+    // During writeback, we call `normalize_erasing_regions`, which will walk past
+    // the `for<'a>` binder and try to normalize `<&'a () as Trivial>::Assoc` directly.
+    // We need to handle this case in the new deep normalizer similarly to how it
+    // is handled in the old solver.
+    let x: Option<for<'a> fn(<&'a () as Trivial>::Assoc)> = None;
+}