mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-25 08:13:41 +00:00
1ad218f3af
As our implementation of MCP411 nears completion and we begin to solicit testing, it's no longer reasonable to expect testers to type or remember `BikeshedIntrinsicFrom`. The name degrades the ease-of-reading of documentation, and the overall experience of using compiler safe transmute. Tentatively, we'll instead adopt `TransmuteFrom`. This name seems to be the one most likely to be stabilized, after discussion on Zulip [1]. We may want to revisit the ordering of `Src` and `Dst` before stabilization, at which point we'd likely consider `TransmuteInto` or `Transmute`. [1] https://rust-lang.zulipchat.com/#narrow/stream/216762-project-safe-transmute/topic/What.20should.20.60BikeshedIntrinsicFrom.60.20be.20named.3F
30 lines
616 B
Rust
30 lines
616 B
Rust
//@ known-bug: rust-lang/rust#126377
|
|
|
|
#![feature(effects)]
|
|
#![feature(generic_const_exprs)]
|
|
|
|
mod assert {
|
|
use std::mem::{Assume, TransmuteFrom};
|
|
|
|
pub fn is_transmutable<
|
|
Src,
|
|
Dst,
|
|
const ASSUME_ALIGNMENT: bool,
|
|
const ASSUME_LIFETIMES: bool,
|
|
const ASSUME_SAFETY: bool,
|
|
const ASSUME_VALIDITY: bool,
|
|
>()
|
|
where
|
|
Dst: TransmuteFrom<
|
|
Src,
|
|
{ }
|
|
>,
|
|
{}
|
|
}
|
|
|
|
const fn from_options() -> Assume {
|
|
#[repr(C)] struct Src;
|
|
#[repr(C)] struct Dst;
|
|
assert::is_transmutable::<Src, Dst, {0u8}, false, false, false>();
|
|
}
|