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
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
//@ check-pass
#![crate_type = "lib"]
#![feature(transmutability, transparent_unions)]
#![allow(dead_code, incomplete_features, non_camel_case_types)]
mod assert {
use std::mem::{Assume, TransmuteFrom};
pub fn is_maybe_transmutable<Src, Dst>()
where
Dst: TransmuteFrom<Src, {
Assume {
alignment: true,
lifetimes: true,
safety: true,
validity: true,
}
}>
{}
}
fn should_accept_repr_rust()
{
union repr_rust {
a: u8
}
assert::is_maybe_transmutable::<repr_rust, ()>();
assert::is_maybe_transmutable::<u128, repr_rust>();
}
fn should_accept_repr_c()
{
#[repr(C)]
union repr_c {
a: u8
}
struct repr_rust;
assert::is_maybe_transmutable::<repr_c, ()>();
assert::is_maybe_transmutable::<u128, repr_c>();
}
fn should_accept_transparent()
{
#[repr(transparent)]
union repr_transparent {
a: u8
}
assert::is_maybe_transmutable::<repr_transparent, ()>();
assert::is_maybe_transmutable::<u128, repr_transparent>();
}
|
