Crate fails with `nightly-2024-02-06`

[virtualritz]

I get:

error[E0658]: use of unstable library feature 'stdarch_x86_avx512'
  --> /home/moritz/.cargo/registry/src/index.crates.io-6f17d22bba15001f/curve25519-dalek-4.1.1/src/backend/vector/ifma/field.rs:26:5
   |
26 |     _mm256_madd52lo_epu64(z.into(), x.into(), y.into()).into()
   |     ^^^^^^^^^^^^^^^^^^^^^
   |
   = 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   = note: this compiler was built on 2024-02-06; consider upgrading it if it is out of date

error[E0658]: use of unstable library feature 'stdarch_x86_avx512'
  --> /home/moritz/.cargo/registry/src/index.crates.io-6f17d22bba15001f/curve25519-dalek-4.1.1/src/backend/vector/ifma/field.rs:25:9
   |
25 |     use core::arch::x86_64::_mm256_madd52lo_epu64;
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = 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   = note: this compiler was built on 2024-02-06; consider upgrading it if it is out of date

error[E0658]: use of unstable library feature 'stdarch_x86_avx512'
  --> /home/moritz/.cargo/registry/src/index.crates.io-6f17d22bba15001f/curve25519-dalek-4.1.1/src/backend/vector/ifma/field.rs:34:5
   |
34 |     _mm256_madd52hi_epu64(z.into(), x.into(), y.into()).into()
   |     ^^^^^^^^^^^^^^^^^^^^^
   |
   = 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   = note: this compiler was built on 2024-02-06; consider upgrading it if it is out of date

error[E0658]: use of unstable library feature 'stdarch_x86_avx512'
  --> /home/moritz/.cargo/registry/src/index.crates.io-6f17d22bba15001f/curve25519-dalek-4.1.1/src/backend/vector/ifma/field.rs:33:9
   |
33 |     use core::arch::x86_64::_mm256_madd52hi_epu64;
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = 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   = note: this compiler was built on 2024-02-06; consider upgrading it if it is out of date

error[E0635]: unknown feature `stdsimd`
  --> /home/moritz/.cargo/registry/src/index.crates.io-6f17d22bba15001f/curve25519-dalek-4.1.1/src/lib.rs:13:70
   |
13 | #![cfg_attr(all(curve25519_dalek_backend = "simd", nightly), feature(stdsimd))]
   |                                                                      ^^^^^^^

[tarcieri]

Dup of #618. See also: #619 #621

Please upgrade to v4.1.2.

[virtualritz]

After bumping to 4.1.2 (but using the nightly-2024-02-04 I downgraded to) I now get:

error[E0658]: use of unstable library feature 'stdsimd'
  --> /home/moritz/.cargo/registry/src/index.crates.io-6f17d22bba15001f/curve25519-dalek-4.1.2/src/backend/vector/ifma/field.rs:26:5
   |
26 |     _mm256_madd52lo_epu64(z.into(), x.into(), y.into()).into()
   |     ^^^^^^^^^^^^^^^^^^^^^
   |
   = note: see issue #48556 <https://github.com/rust-lang/rust/issues/48556> for more information
   = help: add `#![feature(stdsimd)]` to the crate attributes to enable
   = note: this compiler was built on 2024-02-04; consider upgrading it if it is out of date

error[E0658]: use of unstable library feature 'stdsimd'
  --> /home/moritz/.cargo/registry/src/index.crates.io-6f17d22bba15001f/curve25519-dalek-4.1.2/src/backend/vector/ifma/field.rs:25:9
   |
25 |     use core::arch::x86_64::_mm256_madd52lo_epu64;
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: see issue #48556 <https://github.com/rust-lang/rust/issues/48556> for more information
   = help: add `#![feature(stdsimd)]` to the crate attributes to enable
   = note: this compiler was built on 2024-02-04; consider upgrading it if it is out of date

error[E0658]: use of unstable library feature 'stdsimd'
  --> /home/moritz/.cargo/registry/src/index.crates.io-6f17d22bba15001f/curve25519-dalek-4.1.2/src/backend/vector/ifma/field.rs:34:5
   |
34 |     _mm256_madd52hi_epu64(z.into(), x.into(), y.into()).into()
   |     ^^^^^^^^^^^^^^^^^^^^^
   |
   = note: see issue #48556 <https://github.com/rust-lang/rust/issues/48556> for more information
   = help: add `#![feature(stdsimd)]` to the crate attributes to enable
   = note: this compiler was built on 2024-02-04; consider upgrading it if it is out of date

error[E0658]: use of unstable library feature 'stdsimd'
  --> /home/moritz/.cargo/registry/src/index.crates.io-6f17d22bba15001f/curve25519-dalek-4.1.2/src/backend/vector/ifma/field.rs:33:9
   |
33 |     use core::arch::x86_64::_mm256_madd52hi_epu64;
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: see issue #48556 <https://github.com/rust-lang/rust/issues/48556> for more information
   = help: add `#![feature(stdsimd)]` to the crate attributes to enable
   = note: this compiler was built on 2024-02-04; consider upgrading it if it is out of date

error[E0635]: unknown feature `stdarch_x86_avx512`
  --> /home/moritz/.cargo/registry/src/index.crates.io-6f17d22bba15001f/curve25519-dalek-4.1.2/src/lib.rs:19:13
   |
19 |     feature(stdarch_x86_avx512)
   |             ^^^^^^^^^^^^^^^^^^

However, building 4.1.2 with nightly-2024-02-06 works!

[tarcieri]

Yeah, it was a breaking change in the nightly compiler. Newer versions of the crate won't work on older nightlies, and vice versa