mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-23 15:23:46 +00:00
18 lines
550 B
Rust
18 lines
550 B
Rust
// run-pass
|
|
|
|
#![feature(ptr_internals, test)]
|
|
|
|
extern crate test;
|
|
use test::black_box as b; // prevent promotion of the argument and const-propagation of the result
|
|
|
|
use std::ptr::NonNull;
|
|
|
|
const DANGLING: NonNull<u32> = NonNull::dangling();
|
|
const CASTED: NonNull<u32> = NonNull::cast(NonNull::<i32>::dangling());
|
|
|
|
pub fn main() {
|
|
// Be super-extra paranoid and cast the fn items to fn pointers before blackboxing them.
|
|
assert_eq!(DANGLING, b::<fn() -> _>(NonNull::dangling)());
|
|
assert_eq!(CASTED, b::<fn() -> _>(NonNull::dangling)());
|
|
}
|