File: recursive-wrapper-types-bit-incompatible.rs

package info (click to toggle)
rustc 1.87.0%2Bdfsg1-1
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid
  • size: 925,564 kB
  • sloc: xml: 158,127; python: 36,039; javascript: 19,761; sh: 19,737; cpp: 18,981; ansic: 13,133; asm: 4,376; makefile: 710; perl: 29; lisp: 28; ruby: 19; sql: 11
file content (24 lines) | stat: -rw-r--r-- 576 bytes parent folder | download | duplicates (15) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
 
//@ check-fail
#![feature(transmutability)]

mod assert {
    use std::mem::{Assume, TransmuteFrom};

    pub fn is_maybe_transmutable<Src, Dst>()
    where
        Dst: TransmuteFrom<Src, {
            Assume {
                alignment: true,
                lifetimes: false,
                safety: true,
                validity: false,
            }
        }>
    {}
}

fn main() {
    #[repr(C)] struct A(bool, &'static A);
    #[repr(C)] struct B(u8, &'static B);
    assert::is_maybe_transmutable::<&'static B, &'static A>(); //~ ERROR cannot be safely transmuted
}