Auto merge of #45881 - Centril:box-leak, r=alexcrichton

Add Box::leak<'a>(Box<T>) -> &'a mut T where T: 'a

Adds:

```rust
impl<T: ?Sized> Box<T> {
    pub fn leak<'a>(b: Box<T>) -> &'a mut T where T: 'a {
        unsafe { &mut *Box::into_raw(b) }
    }
}
```

which is useful for when you just want to put some stuff on the heap and then have a reference to it for the remainder of the program.

r? @sfackler
cc @durka

0 files changed, 0 insertions, 0 deletions