1 files changed, 27 insertions, 0 deletions
diff --git a/library/core/tests/manually_drop.rs b/library/core/tests/manually_drop.rs
new file mode 100644
index 000000000..9eac27973
--- /dev/null
+++ b/library/core/tests/manually_drop.rs
@@ -0,0 +1,27 @@
+use core::mem::ManuallyDrop;
+
+#[test]
+fn smoke() {
+    #[derive(Clone)]
+    struct TypeWithDrop;
+    impl Drop for TypeWithDrop {
+        fn drop(&mut self) {
+            unreachable!("Should not get dropped");
+        }
+    }
+
+    let x = ManuallyDrop::new(TypeWithDrop);
+    drop(x);
+
+    // also test unsizing
+    let x: Box<ManuallyDrop<[TypeWithDrop]>> =
+        Box::new(ManuallyDrop::new([TypeWithDrop, TypeWithDrop]));
+    drop(x);
+
+    // test clone and clone_from implementations
+    let mut x = ManuallyDrop::new(TypeWithDrop);
+    let y = x.clone();
+    x.clone_from(&y);
+    drop(x);
+    drop(y);
+}