1 files changed, 10 insertions, 0 deletions
diff --git a/src/test/ui/borrowck/borrowck-ref-mut-of-imm.rs b/src/test/ui/borrowck/borrowck-ref-mut-of-imm.rs
new file mode 100644
index 000000000..ae5bb8591
--- /dev/null
+++ b/src/test/ui/borrowck/borrowck-ref-mut-of-imm.rs
@@ -0,0 +1,10 @@
+fn destructure(x: Option<isize>) -> isize {
+    match x {
+      None => 0,
+      Some(ref mut v) => *v //~ ERROR cannot borrow
+    }
+}
+
+fn main() {
+    assert_eq!(destructure(Some(22)), 22);
+}