Build error on nightly-2024-02-05

[swfsql]

Hello, I'm having a compile error on latest nightly when using the nightly_stdsimd for bytemuck on rustc 1.78.0-nightly (f067fd608 2024-02-05).

To test, having a blank project with:

[dependencies]
bytemuck = { version = "=1.14.1", default-features = false, features = [
    "nightly_stdsimd",
] }

Results in a compilation error:

cargo check result

    Checking bytemuck v1.14.1
error[E0658]: use of unstable library feature 'stdarch_x86_avx512'
   --> /usr/local/cargo/registry/src/index.crates.io-6f17d22bba15001f/bytemuck-1.14.1/src/lib.rs:122:28
    |
122 |       unsafe impl $trait for $platform::$first_type {}
    |                              ^
    |
   ::: /usr/local/cargo/registry/src/index.crates.io-6f17d22bba15001f/bytemuck-1.14.1/src/zeroable.rs:239:1
    |
239 | / impl_unsafe_marker_for_simd!(
240 | |   #[cfg(all(target_arch = "x86_64", feature = "nightly_stdsimd"))]
241 | |   unsafe impl Zeroable for x86_64::{
242 | |     __m128bh, __m256bh, __m512,
243 | |     __m512bh, __m512d, __m512i,
244 | |   }
245 | | );
    | |_- in this macro invocation
    |
    = note: see issue #111137 <https://github.com/rust-lang/rust/issues/111137> for more information
    = help: add `#![feature(stdarch_x86_avx512)]` to the crate attributes to enable
    = note: this compiler was built on 2024-02-05; consider upgrading it if it is out of date
    = note: this error originates in the macro `impl_unsafe_marker_for_simd` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0658]: use of unstable library feature 'stdarch_x86_avx512'
   --> /usr/local/cargo/registry/src/index.crates.io-6f17d22bba15001f/bytemuck-1.14.1/src/lib.rs:122:28
    |
122 |       unsafe impl $trait for $platform::$first_type {}
    |                              ^
    |
   ::: /usr/local/cargo/registry/src/index.crates.io-6f17d22bba15001f/bytemuck-1.14.1/src/pod.rs:159:1
    |
159 | / impl_unsafe_marker_for_simd!(
160 | |   #[cfg(all(target_arch = "x86_64", feature = "nightly_stdsimd"))]
161 | |   unsafe impl Pod for x86_64::{
162 | |     __m128bh, __m256bh, __m512,
163 | |     __m512bh, __m512d, __m512i,
164 | |   }
165 | | );
    | |_- in this macro invocation
    |
    = note: see issue #111137 <https://github.com/rust-lang/rust/issues/111137> for more information
    = help: add `#![feature(stdarch_x86_avx512)]` to the crate attributes to enable
    = note: this compiler was built on 2024-02-05; consider upgrading it if it is out of date
    = note: this error originates in the macro `impl_unsafe_marker_for_simd` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0635]: unknown feature `stdsimd`
 --> /usr/local/cargo/registry/src/index.crates.io-6f17d22bba15001f/bytemuck-1.14.1/src/lib.rs:7:50
  |
7 | #![cfg_attr(feature = "nightly_stdsimd", feature(stdsimd))]
  |                                                  ^^^^^^^

Some errors have detailed explanations: E0635, E0658.
For more information about an error, try `rustc --explain E0635`.
error: could not compile `bytemuck` (lib) due to 7 previous errors

As the messages suggest, putting stdarch_x86_avx512 in place of stdsimd in:

bytemuck/src/lib.rs

Line 7 in 5f93477

#![cfg_attr(feature = "nightly_stdsimd", feature(stdsimd))]

Seems to fix it.

---

Note:

• As I'm not familiar with the library nor with the tracking issue, I'm refraining from trying to send a PR.
• I'm aware that something like this was somewhat expected, as stated in:
  

  bytemuck/Cargo.toml

  Lines 40 to 42 in 5f93477

  	# NOT SEMVER SUPPORTED! TEMPORARY ONLY!
  	nightly_portable_simd = []
  	nightly_stdsimd = []

Thanks!

[Lokathor]

Released bytemuck-1.14.2, which uses the new Nightly feature name.