+
+fn manually_drop() {
+ use std::mem::ManuallyDrop;
+ use std::sync::Arc;
+
+ let a = ManuallyDrop::new(Arc::new("Hello!".to_owned()));
+ let _ = a.clone(); // OK
+
+ let p: *const String = Arc::into_raw(ManuallyDrop::into_inner(a));
+ unsafe {
+ Arc::from_raw(p);
+ Arc::from_raw(p);
+ }
+}