1 files changed, 8 insertions, 0 deletions
diff --git a/src/test/ui/coherence/coherence-overlap-negate-not-use-feature-gate.rs b/src/test/ui/coherence/coherence-overlap-negate-not-use-feature-gate.rs
new file mode 100644
index 000000000..a067736f6
--- /dev/null
+++ b/src/test/ui/coherence/coherence-overlap-negate-not-use-feature-gate.rs
@@ -0,0 +1,8 @@
+use std::ops::DerefMut;
+
+trait Foo {}
+impl<T: DerefMut> Foo for T {}
+impl<U> Foo for &U {}
+//~^ ERROR: conflicting implementations of trait `Foo` for type `&_` [E0119]
+
+fn main() {}