1 files changed, 15 insertions, 0 deletions
diff --git a/tests/ui/box/unit/unique-in-vec-copy.rs b/tests/ui/box/unit/unique-in-vec-copy.rs
new file mode 100644
index 000000000..ce52d15ef
--- /dev/null
+++ b/tests/ui/box/unit/unique-in-vec-copy.rs
@@ -0,0 +1,15 @@
+// run-pass
+
+pub fn main() {
+    let mut a: Vec<Box<_>> = vec![Box::new(10)];
+    let b = a.clone();
+
+    assert_eq!(*a[0], 10);
+    assert_eq!(*b[0], 10);
+
+    // This should only modify the value in a, not b
+    *a[0] = 20;
+
+    assert_eq!(*a[0], 20);
+    assert_eq!(*b[0], 10);
+}