1 files changed, 14 insertions, 0 deletions
diff --git a/src/test/ui/mut/mut-cant-alias.rs b/src/test/ui/mut/mut-cant-alias.rs
new file mode 100644
index 000000000..9146b931a
--- /dev/null
+++ b/src/test/ui/mut/mut-cant-alias.rs
@@ -0,0 +1,14 @@
+use std::cell::RefCell;
+
+
+
+fn main() {
+    let m = RefCell::new(0);
+    let mut b = m.borrow_mut();
+    let b1 = &mut *b;
+    let b2 = &mut *b; //~ ERROR cannot borrow
+    b1.use_mut();
+}
+
+trait Fake { fn use_mut(&mut self) { } fn use_ref(&self) { }  }
+impl<T> Fake for T { }