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const_fn_unsize: check that the cast behaves correctly

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This commit is contained in:
Ralf Jung 2021-05-08 16:36:39 +02:00
parent 65cd051b4a
commit 5c6f41e349
1 changed files with 10 additions and 3 deletions
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13
src/test/ui/consts/const_fn_unsize.rs
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@ -1,14 +1,21 @@
// check-pass // run-pass
#![feature(slice_ptr_len)]
use std::ptr::NonNull; use std::ptr::NonNull;
#[allow(unused)]
const fn test() { const fn test() {
let _x = NonNull::<[i32; 0]>::dangling() as NonNull<[i32]>; let _x = NonNull::<[i32; 0]>::dangling() as NonNull<[i32]>;
} }
// Regression test for #75118. // Regression test for #75118.
pub const fn dangling_slice<T>() -> NonNull<[T]> { pub const fn dangling_slice<T>() -> NonNull<[T]> {
NonNull::<[T; 0]>::dangling() NonNull::<[T; 1]>::dangling()
} }
fn main() {} const C: NonNull<[i32]> = dangling_slice();
fn main() {
assert_eq!(C.as_ptr(), NonNull::<[i32; 1]>::dangling().as_ptr() as *mut _);
assert_eq!(C.as_ptr().len(), 1);
}