1 files changed, 10 insertions, 0 deletions
diff --git a/tests/ui/box/unit/unique-assign-drop.rs b/tests/ui/box/unit/unique-assign-drop.rs
new file mode 100644
index 000000000..e7685b589
--- /dev/null
+++ b/tests/ui/box/unit/unique-assign-drop.rs
@@ -0,0 +1,10 @@
+// run-pass
+#![allow(unused_assignments)]
+
+pub fn main() {
+    let i: Box<_> = Box::new(1);
+    let mut j: Box<_> = Box::new(2);
+    // Should drop the previous value of j
+    j = i;
+    assert_eq!(*j, 1);
+}