1 files changed, 17 insertions, 0 deletions
diff --git a/src/test/ui/associated-types/associated-types-duplicate-binding-in-env-hrtb.rs b/src/test/ui/associated-types/associated-types-duplicate-binding-in-env-hrtb.rs
new file mode 100644
index 000000000..12ca10043
--- /dev/null
+++ b/src/test/ui/associated-types/associated-types-duplicate-binding-in-env-hrtb.rs
@@ -0,0 +1,17 @@
+// run-pass
+#![allow(dead_code)]
+// Check that we do not report ambiguities when equivalent predicates
+// (modulo bound lifetime names) appears in the environment
+// twice. Issue #21965.
+
+// pretty-expanded FIXME #23616
+
+fn foo<T>(t: T) -> i32
+    where T : for<'a> Fn(&'a u8) -> i32,
+          T : for<'b> Fn(&'b u8) -> i32,
+{
+    t(&3)
+}
+
+fn main() {
+}