mirror of
https://github.com/rust-lang/rust.git
synced 2024-10-31 22:41:50 +00:00
33 lines
795 B
Rust
33 lines
795 B
Rust
// revisions: current next
|
|
//[next] compile-flags: -Znext-solver
|
|
|
|
//! The unit type, `()`, should be one byte.
|
|
|
|
#![crate_type = "lib"]
|
|
#![feature(transmutability)]
|
|
#![allow(dead_code)]
|
|
|
|
mod assert {
|
|
use std::mem::{Assume, BikeshedIntrinsicFrom};
|
|
|
|
pub fn is_transmutable<Src, Dst, Context>()
|
|
where
|
|
Dst: BikeshedIntrinsicFrom<Src, Context, {
|
|
Assume::ALIGNMENT
|
|
.and(Assume::LIFETIMES)
|
|
.and(Assume::SAFETY)
|
|
.and(Assume::VALIDITY)
|
|
}>
|
|
{}
|
|
}
|
|
|
|
#[repr(C)]
|
|
struct Zst;
|
|
|
|
fn should_have_correct_size() {
|
|
struct Context;
|
|
assert::is_transmutable::<(), Zst, Context>();
|
|
assert::is_transmutable::<Zst, (), Context>();
|
|
assert::is_transmutable::<(), u8, Context>(); //~ ERROR cannot be safely transmuted
|
|
}
|