1 files changed, 32 insertions, 0 deletions
diff --git a/tests/ui/borrowck/borrowck-mut-uniq.rs b/tests/ui/borrowck/borrowck-mut-uniq.rs
new file mode 100644
index 000000000..255b4995b
--- /dev/null
+++ b/tests/ui/borrowck/borrowck-mut-uniq.rs
@@ -0,0 +1,32 @@
+// run-pass
+
+use std::mem::swap;
+
+#[derive(Debug)]
+struct Ints {sum: Box<isize>, values: Vec<isize> }
+
+fn add_int(x: &mut Ints, v: isize) {
+    *x.sum += v;
+    let mut values = Vec::new();
+    swap(&mut values, &mut x.values);
+    values.push(v);
+    swap(&mut values, &mut x.values);
+}
+
+fn iter_ints<F>(x: &Ints, mut f: F) -> bool where F: FnMut(&isize) -> bool {
+    let l = x.values.len();
+    (0..l).all(|i| f(&x.values[i]))
+}
+
+pub fn main() {
+    let mut ints: Box<_> = Box::new(Ints {sum: Box::new(0), values: Vec::new()});
+    add_int(&mut *ints, 22);
+    add_int(&mut *ints, 44);
+
+    iter_ints(&*ints, |i| {
+        println!("isize = {:?}", *i);
+        true
+    });
+
+    println!("ints={:?}", ints);
+}