1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
|
// check-pass
//! If validity is assumed, there need only be one matching bit-pattern between
//! the source and destination types.
#![crate_type = "lib"]
#![feature(transmutability)]
#![allow(dead_code, incomplete_features, non_camel_case_types)]
mod assert {
use std::mem::{Assume, BikeshedIntrinsicFrom};
pub struct Context;
pub fn is_maybe_transmutable<Src, Dst>()
where
Dst: BikeshedIntrinsicFrom<Src, Context, { Assume::SAFETY.and(Assume::VALIDITY) }>
{}
}
#[derive(Clone, Copy)] #[repr(u8)] enum Ox00 { V = 0x00 }
#[derive(Clone, Copy)] #[repr(u8)] enum Ox7F { V = 0x7F }
#[derive(Clone, Copy)] #[repr(u8)] enum OxFF { V = 0xFF }
fn test() {
#[repr(C)]
union A {
a: Ox00,
b: Ox7F,
}
#[repr(C)]
union B {
a: Ox7F,
b: OxFF,
}
assert::is_maybe_transmutable::<A, B>();
assert::is_maybe_transmutable::<B, A>();
}
|
