1 files changed, 21 insertions, 0 deletions
diff --git a/src/test/ui/implied-bounds/impl-implied-bounds-compatibility.rs b/src/test/ui/implied-bounds/impl-implied-bounds-compatibility.rs
new file mode 100644
index 000000000..d097bc16a
--- /dev/null
+++ b/src/test/ui/implied-bounds/impl-implied-bounds-compatibility.rs
@@ -0,0 +1,21 @@
+#![deny(implied_bounds_entailment)]
+
+use std::cell::RefCell;
+
+pub struct MessageListeners<'a> {
+    listeners: RefCell<Vec<Box<dyn FnMut(()) + 'a>>>,
+}
+
+pub trait MessageListenersInterface {
+    fn listeners<'c>(&'c self) -> &'c MessageListeners<'c>;
+}
+
+impl<'a> MessageListenersInterface for MessageListeners<'a> {
+    fn listeners<'b>(&'b self) -> &'a MessageListeners<'b> {
+        //~^ ERROR impl method assumes more implied bounds than the corresponding trait method
+        //~| WARN this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+        self
+    }
+}
+
+fn main() {}