1 files changed, 20 insertions, 0 deletions
diff --git a/tests/ui/auxiliary/issue-16822.rs b/tests/ui/auxiliary/issue-16822.rs
new file mode 100644
index 000000000..9042dd391
--- /dev/null
+++ b/tests/ui/auxiliary/issue-16822.rs
@@ -0,0 +1,20 @@
+#![crate_type="lib"]
+
+use std::cell::RefCell;
+
+pub struct Window<Data>{
+    pub data: RefCell<Data>
+}
+
+impl<Data:  Update> Window<Data> {
+    pub fn update(&self, e: i32) {
+        match e {
+            1 => self.data.borrow_mut().update(),
+            _ => {}
+        }
+    }
+}
+
+pub trait Update {
+    fn update(&mut self);
+}