1 files changed, 28 insertions, 0 deletions
diff --git a/tests/ui/borrowck/borrowck-freeze-frozen-mut.rs b/tests/ui/borrowck/borrowck-freeze-frozen-mut.rs
new file mode 100644
index 000000000..199931d6d
--- /dev/null
+++ b/tests/ui/borrowck/borrowck-freeze-frozen-mut.rs
@@ -0,0 +1,28 @@
+// run-pass
+// Test that a `&mut` inside of an `&` is freezable.
+
+
+struct MutSlice<'a, T:'a> {
+    data: &'a mut [T]
+}
+
+fn get<'a, T>(ms: &'a MutSlice<'a, T>, index: usize) -> &'a T {
+    &ms.data[index]
+}
+
+pub fn main() {
+    let mut data = [1, 2, 3];
+    {
+        let slice = MutSlice { data: &mut data };
+        slice.data[0] += 4;
+        let index0 = get(&slice, 0);
+        let index1 = get(&slice, 1);
+        let index2 = get(&slice, 2);
+        assert_eq!(*index0, 5);
+        assert_eq!(*index1, 2);
+        assert_eq!(*index2, 3);
+    }
+    assert_eq!(data[0], 5);
+    assert_eq!(data[1], 2);
+    assert_eq!(data[2], 3);
+}