mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-01 15:01:51 +00:00
32 lines
1.1 KiB
Rust
32 lines
1.1 KiB
Rust
// run-pass
|
|
|
|
// This does not reflect a stable guarantee (we guarantee very little for equality of pointers
|
|
// around `const`), but it would be good to understand what is happening if these assertions ever
|
|
// fail.
|
|
use std::ptr::NonNull;
|
|
use std::slice::from_raw_parts;
|
|
|
|
const PTR_U8: *const u8 = NonNull::dangling().as_ptr();
|
|
const CONST_U8_REF: &[u8] = unsafe { from_raw_parts(PTR_U8, 0) };
|
|
const CONST_U8_PTR: *const u8 = unsafe { from_raw_parts(PTR_U8, 0).as_ptr() };
|
|
static STATIC_U8_REF: &[u8] = unsafe { from_raw_parts(PTR_U8, 0) };
|
|
|
|
const PTR_U16: *const u16 = NonNull::dangling().as_ptr();
|
|
const CONST_U16_REF: &[u16] = unsafe { from_raw_parts(PTR_U16, 0) };
|
|
|
|
const fn const_u8_fn() -> &'static [u8] {
|
|
unsafe { from_raw_parts(PTR_U8, 0) }
|
|
}
|
|
|
|
fn main() {
|
|
let ptr_u8 = unsafe { from_raw_parts(PTR_U8, 0) }.as_ptr();
|
|
let ptr_u16 = unsafe { from_raw_parts(PTR_U16, 0) }.as_ptr();
|
|
|
|
assert_eq!(ptr_u8, PTR_U8);
|
|
assert_eq!(ptr_u8, CONST_U8_PTR);
|
|
assert_eq!(ptr_u8, const_u8_fn().as_ptr());
|
|
assert_eq!(ptr_u8, STATIC_U8_REF.as_ptr());
|
|
assert_eq!(ptr_u16, CONST_U16_REF.as_ptr());
|
|
assert_eq!(ptr_u8, CONST_U8_REF.as_ptr());
|
|
}
|