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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
38 lines
1010 B
Rust
38 lines
1010 B
Rust
//@ check-fail
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#![feature(generic_const_exprs, transmutability)]
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#![allow(incomplete_features)]
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mod assert {
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use std::mem::{Assume, TransmuteFrom};
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pub fn is_transmutable<
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Src,
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Dst,
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const ASSUME_ALIGNMENT: bool,
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const ASSUME_LIFETIMES: bool,
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const ASSUME_SAFETY: bool,
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const ASSUME_VALIDITY: bool,
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>()
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where
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Dst: TransmuteFrom<
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Src,
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{ from_options(ASSUME_ALIGNMENT, ASSUME_LIFETIMES, ASSUME_SAFETY, ASSUME_VALIDITY) }
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>,
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{}
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// This should not cause an ICE
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const fn from_options(
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, //~ ERROR expected parameter name, found `,`
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, //~ ERROR expected parameter name, found `,`
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, //~ ERROR expected parameter name, found `,`
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, //~ ERROR expected parameter name, found `,`
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) -> Assume {} //~ ERROR mismatched types
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}
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fn main() {
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#[repr(C)] struct Src;
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#[repr(C)] struct Dst;
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assert::is_transmutable::<Src, Dst, false, false, { true }, false>();
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}
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