1 files changed, 28 insertions, 0 deletions
diff --git a/tests/ui/implied-bounds/normalization-preserve-equality.rs b/tests/ui/implied-bounds/normalization-preserve-equality.rs
new file mode 100644
index 000000000..557c171e5
--- /dev/null
+++ b/tests/ui/implied-bounds/normalization-preserve-equality.rs
@@ -0,0 +1,28 @@
+// Both revisions should pass. `borrowck` revision is a bug!
+//
+// revisions: wfcheck borrowck
+// [wfcheck] check-pass
+// [borrowck] check-fail
+// [borrowck] known-bug: #106569
+
+struct Equal<'a, 'b>(&'a &'b (), &'b &'a ()); // implies 'a == 'b
+
+trait Trait {
+    type Ty;
+}
+
+impl<'x> Trait for Equal<'x, 'x> {
+    type Ty = ();
+}
+
+trait WfCheckTrait {}
+
+#[cfg(wfcheck)]
+impl<'a, 'b> WfCheckTrait for (<Equal<'a, 'b> as Trait>::Ty, Equal<'a, 'b>) {}
+
+#[cfg(borrowck)]
+fn test_borrowck<'a, 'b>(_: (<Equal<'a, 'b> as Trait>::Ty, Equal<'a, 'b>)) {
+    let _ = None::<Equal<'a, 'b>>;
+}
+
+fn main() {}