3 use std::mem::ManuallyDrop;
5 union Wrap<T> { x: ManuallyDrop<T> }
7 impl<T> Drop for Wrap<T> {
9 unsafe { std::ptr::drop_in_place(&mut *self.x as *mut T); }
14 fn new(x: T) -> Self {
15 Wrap { x: ManuallyDrop::new(x) }
19 impl<T> Deref for Wrap<T> {
22 fn deref(&self) -> &Self::Target {
29 struct C<'a>(Cell<Option<&'a C<'a>>>);
31 impl<'a> Drop for C<'a> {
36 let v : Wrap<C> = Wrap::new(C(Cell::new(None)));
37 v.0.set(Some(&v)); //~ ERROR: `v` does not live long enough