mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-01 15:01:51 +00:00
25 lines
533 B
Rust
25 lines
533 B
Rust
use std::mem;
|
|
|
|
fn leak<T>(mut b: Box<T>) -> &'static mut T {
|
|
// isn't this supposed to be safe?
|
|
let inner = &mut *b as *mut _;
|
|
mem::forget(b);
|
|
unsafe { &mut *inner }
|
|
}
|
|
|
|
fn evil(mut s: &'static mut String)
|
|
{
|
|
// create alias
|
|
let alias: &'static mut String = s;
|
|
let inner: &str = &alias;
|
|
// free value
|
|
*s = String::new(); //~ ERROR cannot assign
|
|
let _spray = "0wned".to_owned();
|
|
// ... and then use it
|
|
println!("{}", inner);
|
|
}
|
|
|
|
fn main() {
|
|
evil(leak(Box::new("hello".to_owned())));
|
|
}
|