From c68c6c3942d8c3aab4d9e9406a0a4473218f8cea Mon Sep 17 00:00:00 2001
From: Michael Goulet <michael@errs.io>
Date: Fri, 14 Apr 2023 03:21:21 +0000
Subject: [PATCH] Add test for uniquifying regions

---
 tests/ui/traits/new-solver/iter-filter-projection.rs | 12 ++++++++++++
 1 file changed, 12 insertions(+)
 create mode 100644 tests/ui/traits/new-solver/iter-filter-projection.rs

diff --git a/tests/ui/traits/new-solver/iter-filter-projection.rs b/tests/ui/traits/new-solver/iter-filter-projection.rs
new file mode 100644
index 00000000000..8fb62323aa5
--- /dev/null
+++ b/tests/ui/traits/new-solver/iter-filter-projection.rs
@@ -0,0 +1,12 @@
+// compile-flags: -Ztrait-solver=next
+// check-pass
+
+use std::{iter, slice};
+
+struct Attr;
+
+fn test<'a, T: Iterator<Item = &'a Attr>>() {}
+
+fn main() {
+    test::<iter::Filter<slice::Iter<'_, Attr>, fn(&&Attr) -> bool>>();
+}