1 files changed, 10 insertions, 0 deletions
diff --git a/tests/ui/error-codes/E0499.rs b/tests/ui/error-codes/E0499.rs
new file mode 100644
index 000000000..919f97c8a
--- /dev/null
+++ b/tests/ui/error-codes/E0499.rs
@@ -0,0 +1,10 @@
+fn main() {
+    let mut i = 0;
+    let mut x = &mut i;
+    let mut a = &mut i; //~ ERROR E0499
+    a.use_mut();
+    x.use_mut();
+}
+
+trait Fake { fn use_mut(&mut self) { } fn use_ref(&self) { }  }
+impl<T> Fake for T { }