1 files changed, 8 insertions, 0 deletions
diff --git a/tests/ui/box/unit/unique-assign.rs b/tests/ui/box/unit/unique-assign.rs
new file mode 100644
index 000000000..d598744f1
--- /dev/null
+++ b/tests/ui/box/unit/unique-assign.rs
@@ -0,0 +1,8 @@
+// run-pass
+#![allow(unused_mut)]
+
+pub fn main() {
+    let mut i: Box<_>;
+    i = Box::new(1);
+    assert_eq!(*i, 1);
+}