diff --git a/devel/electron39/files/patch-rust-1.95 b/devel/electron39/files/patch-rust-1.95
new file mode 100644
index 000000000000..fb3d479d767a
--- /dev/null
+++ b/devel/electron39/files/patch-rust-1.95
@@ -0,0 +1,478 @@
+diff -audpNr third_party/rust/bytemuck.orig/v1/BUILD.gn third_party/rust/bytemuck/v1/BUILD.gn
+--- third_party/rust/bytemuck.orig/v1/BUILD.gn	2026-01-06 08:20:51.000000000 +0900
++++ third_party/rust/bytemuck/v1/BUILD.gn	2026-04-23 04:38:43.760520000 +0900
+@@ -39,16 +39,21 @@ cargo_crate("lib") {
+   cargo_pkg_name = "bytemuck"
+   cargo_pkg_description = "A crate for mucking around with piles of bytes."
+   cargo_pkg_repository = "https://github.com/Lokathor/bytemuck"
+-  cargo_pkg_version = "1.23.2"
++  cargo_pkg_version = "1.25.0"
+ 
+   allow_unsafe = true
+ 
+-  deps = [ "//third_party/rust/bytemuck_derive/v1:lib" ]
++  deps = [
++    "//third_party/rust/bytemuck_derive/v1:lib",
++    "//third_party/rust/rustversion/v1:lib",
++  ]
+   features = [
+     "bytemuck_derive",
+     "derive",
++    "extern_crate_alloc",
+     "min_const_generics",
+     "nightly_portable_simd",
++    "rustversion",
+   ]
+ 
+   # `gnrt_config.toml` for this crate specifies `allow_unstable_features`.
+diff -audpNr third_party/rust/bytemuck.orig/v1/README.chromium third_party/rust/bytemuck/v1/README.chromium
+--- third_party/rust/bytemuck.orig/v1/README.chromium	2026-01-06 08:20:51.000000000 +0900
++++ third_party/rust/bytemuck/v1/README.chromium	2026-04-23 04:38:43.760590000 +0900
+@@ -1,8 +1,8 @@ URL: https://crates.io/crates/bytemuck
+ Name: bytemuck
+ URL: https://crates.io/crates/bytemuck
+-Version: 1.23.2
+-Revision: c069a2f6a4c7f3416257d0378c799085aa5626bb
+-Update Mechanism: Manual
++Version: 1.25.0
++Revision: 164cedda0eae131bc6cb67902599f4ec253642ca
++Update Mechanism: Manual (https://crbug.com/449898466)
+ License: Apache-2.0
+ License File: //third_party/rust/chromium_crates_io/vendor/bytemuck-v1/LICENSE-APACHE
+ Shipped: yes
+diff -audpNr third_party/rust/rustversion.orig/v1/BUILD.gn third_party/rust/rustversion/v1/BUILD.gn
+--- third_party/rust/rustversion.orig/v1/BUILD.gn	2026-01-06 08:20:51.000000000 +0900
++++ third_party/rust/rustversion/v1/BUILD.gn	2026-04-23 04:38:50.349498000 +0900
+@@ -44,7 +44,7 @@ cargo_crate("lib") {
+ 
+   build_root = "//third_party/rust/chromium_crates_io/vendor/rustversion-v1/build/build.rs"
+   build_sources = [ "//third_party/rust/chromium_crates_io/vendor/rustversion-v1/build/build.rs" ]
+-  build_script_inputs = [ "//third_party/rust/chromium_crates_io/vendor/rustversion-v1/src/../build/rustc.rs" ]
++  build_script_inputs = [ "//third_party/rust/chromium_crates_io/vendor/rustversion-v1/src/../../rustversion-v1/build/rustc.rs" ]
+   build_script_outputs = [ "version.expr" ]
+ 
+   # Only for usage from third-party crates. Add the crate to
+diff -audpNr third_party/rust/rustversion.orig/v1/README.chromium third_party/rust/rustversion/v1/README.chromium
+--- third_party/rust/rustversion.orig/v1/README.chromium	2026-01-06 08:20:51.000000000 +0900
++++ third_party/rust/rustversion/v1/README.chromium	2026-04-23 04:38:50.349566000 +0900
+@@ -2,7 +2,7 @@ Revision: 9e86f839b6a34a7d9398f243d88bf400b7fa1f7c
+ URL: https://crates.io/crates/rustversion
+ Version: 1.0.22
+ Revision: 9e86f839b6a34a7d9398f243d88bf400b7fa1f7c
+-Update Mechanism: Manual
++Update Mechanism: Manual (https://crbug.com/449898466)
+ License: Apache-2.0
+ License File: //third_party/rust/chromium_crates_io/vendor/rustversion-v1/LICENSE-APACHE
+ Shipped: yes
+diff -audpNr third_party/rust/chromium_crates_io/vendor/bytemuck-v1.orig/.cargo_vcs_info.json third_party/rust/chromium_crates_io/vendor/bytemuck-v1/.cargo_vcs_info.json
+--- third_party/rust/chromium_crates_io/vendor/bytemuck-v1.orig/.cargo_vcs_info.json	2026-01-06 08:20:51.000000000 +0900
++++ third_party/rust/chromium_crates_io/vendor/bytemuck-v1/.cargo_vcs_info.json	2026-04-23 04:39:29.861464000 +0900
+@@ -1,6 +1,6 @@
+ {
+   "git": {
+-    "sha1": "c069a2f6a4c7f3416257d0378c799085aa5626bb"
++    "sha1": "164cedda0eae131bc6cb67902599f4ec253642ca"
+   },
+   "path_in_vcs": ""
+ }
+\ No newline at end of file
+diff -audpNr third_party/rust/chromium_crates_io/vendor/bytemuck-v1.orig/.github/workflows/rust.yml third_party/rust/chromium_crates_io/vendor/bytemuck-v1/.github/workflows/rust.yml
+--- third_party/rust/chromium_crates_io/vendor/bytemuck-v1.orig/.github/workflows/rust.yml	2026-01-06 08:20:51.000000000 +0900
++++ third_party/rust/chromium_crates_io/vendor/bytemuck-v1/.github/workflows/rust.yml	2026-04-23 04:39:29.861650000 +0900
+@@ -19,7 +19,7 @@ jobs:
+         include:
+         # versions (all on linux-x86_64)
+         - { rust: 1.34.0, os: ubuntu-latest }
+-        - { rust: 1.61.0, os: ubuntu-latest }
++        - { rust: 1.68.0, os: ubuntu-latest }
+         - { rust: stable, os: ubuntu-latest }
+         - { rust: beta, os: ubuntu-latest }
+         - { rust: nightly, os: ubuntu-latest }
+@@ -38,19 +38,20 @@ jobs:
+     - run: cargo test --verbose --no-default-features
+     - run: cargo test --verbose
+     - run: cargo test --verbose --features derive
+-      if: matrix.rust == '1.61.0'
++      if: matrix.rust == '1.68.0'
+     - run: cargo test --verbose --all-features
+       if: matrix.rust == 'nightly'
+     - run: cargo test --verbose --manifest-path=derive/Cargo.toml --all-features
+       if: matrix.rust == 'nightly'
++    - run: cd contiguous_bitset && cargo test
++      if: matrix.rust == 'stable'
+ 
+   cross-test:
+     name: Test on ${{ matrix.target }} with cross
+     runs-on: ubuntu-latest
+     strategy:
+       matrix:
+-        # we once had mips runners for Big-endian coverage but those got demoted to tier 3.
+-        target: [i686-unknown-linux-gnu]
++        target: [i686-unknown-linux-gnu, s390x-unknown-linux-gnu]
+     steps:
+     - uses: hecrj/setup-rust-action@v1
+       with:
+@@ -59,6 +60,7 @@ jobs:
+     - run: cargo install cross
+     - run: cross test --verbose --target=${{ matrix.target }} --no-default-features
+     - run: cross test --verbose --target=${{ matrix.target }}
++    - run: cd derive && cross test --verbose --target=${{ matrix.target }}
+     - run: cross test --verbose --target=${{ matrix.target }} --all-features
+       if: matrix.rust == 'nightly'
+     - run: cross test --verbose --target=${{ matrix.target }} --manifest-path=derive/Cargo.toml --all-features
+diff -audpNr third_party/rust/chromium_crates_io/vendor/bytemuck-v1.orig/.gitignore third_party/rust/chromium_crates_io/vendor/bytemuck-v1/.gitignore
+--- third_party/rust/chromium_crates_io/vendor/bytemuck-v1.orig/.gitignore	2026-01-06 08:20:51.000000000 +0900
++++ third_party/rust/chromium_crates_io/vendor/bytemuck-v1/.gitignore	2026-04-23 04:39:29.861440000 +0900
+@@ -1,10 +1,6 @@ Cargo.lock
+ 
+ Cargo.lock
+-/target/
+-/.vscode/
+-
+-# These are backup files generated by rustfmt
+ **/*.rs.bk
+ 
+-/derive/target/
+-/derive/.vscode/
++**/target/
++**/.vscode/
+diff -audpNr third_party/rust/chromium_crates_io/vendor/bytemuck-v1.orig/Cargo.lock third_party/rust/chromium_crates_io/vendor/bytemuck-v1/Cargo.lock
+--- third_party/rust/chromium_crates_io/vendor/bytemuck-v1.orig/Cargo.lock	2026-01-06 08:20:51.000000000 +0900
++++ third_party/rust/chromium_crates_io/vendor/bytemuck-v1/Cargo.lock	2026-04-23 04:39:29.861603000 +0900
+@@ -4,16 +4,17 @@ name = "bytemuck"
+ 
+ [[package]]
+ name = "bytemuck"
+-version = "1.23.2"
++version = "1.25.0"
+ dependencies = [
+  "bytemuck_derive",
++ "rustversion",
+ ]
+ 
+ [[package]]
+ name = "bytemuck_derive"
+-version = "1.10.1"
++version = "1.10.2"
+ source = "registry+https://github.com/rust-lang/crates.io-index"
+-checksum = "4f154e572231cb6ba2bd1176980827e3d5dc04cc183a75dea38109fbdd672d29"
++checksum = "f9abbd1bc6865053c427f7198e6af43bfdedc55ab791faed4fbd361d789575ff"
+ dependencies = [
+  "proc-macro2",
+  "quote",
+@@ -22,9 +23,9 @@ name = "proc-macro2"
+ 
+ [[package]]
+ name = "proc-macro2"
+-version = "1.0.94"
++version = "1.0.95"
+ source = "registry+https://github.com/rust-lang/crates.io-index"
+-checksum = "a31971752e70b8b2686d7e46ec17fb38dad4051d94024c88df49b667caea9c84"
++checksum = "02b3e5e68a3a1a02aad3ec490a98007cbc13c37cbe84a3cd7b8e406d76e7f778"
+ dependencies = [
+  "unicode-ident",
+ ]
+@@ -39,10 +40,16 @@ dependencies = [
+ ]
+ 
+ [[package]]
++name = "rustversion"
++version = "1.0.22"
++source = "registry+https://github.com/rust-lang/crates.io-index"
++checksum = "b39cdef0fa800fc44525c84ccb54a029961a8215f9619753635a9c0d2538d46d"
++
++[[package]]
+ name = "syn"
+-version = "2.0.100"
++version = "2.0.101"
+ source = "registry+https://github.com/rust-lang/crates.io-index"
+-checksum = "b09a44accad81e1ba1cd74a32461ba89dee89095ba17b32f5d03683b1b1fc2a0"
++checksum = "8ce2b7fc941b3a24138a0a7cf8e858bfc6a992e7978a068a5c760deb0ed43caf"
+ dependencies = [
+  "proc-macro2",
+  "quote",
+diff -audpNr third_party/rust/chromium_crates_io/vendor/bytemuck-v1.orig/Cargo.toml third_party/rust/chromium_crates_io/vendor/bytemuck-v1/Cargo.toml
+--- third_party/rust/chromium_crates_io/vendor/bytemuck-v1.orig/Cargo.toml	2026-01-06 08:20:51.000000000 +0900
++++ third_party/rust/chromium_crates_io/vendor/bytemuck-v1/Cargo.toml	2026-04-23 04:39:29.861449000 +0900
+@@ -12,10 +12,14 @@ name = "bytemuck"
+ [package]
+ edition = "2018"
+ name = "bytemuck"
+-version = "1.23.2"
++version = "1.25.0"
+ authors = ["Lokathor <zefria@gmail.com>"]
+ build = false
+-exclude = ["/pedantic.bat"]
++exclude = [
++    "/pedantic.bat",
++    "derive/",
++    "contiguous_bitset/",
++]
+ autolib = false
+ autobins = false
+ autoexamples = false
+@@ -84,7 +88,7 @@ nightly_float = []
+ must_cast_extra = ["must_cast"]
+ nightly_docs = []
+ nightly_float = []
+-nightly_portable_simd = []
++nightly_portable_simd = ["rustversion"]
+ nightly_stdsimd = []
+ pod_saturating = []
+ track_caller = []
+@@ -136,7 +140,11 @@ path = "tests/wrapper_forgets.rs"
+ path = "tests/wrapper_forgets.rs"
+ 
+ [dependencies.bytemuck_derive]
+-version = "1.10.1"
++version = "1.10.2"
++optional = true
++
++[dependencies.rustversion]
++version = "1.0.22"
+ optional = true
+ 
+ [lints.rust.unexpected_cfgs]
+diff -audpNr third_party/rust/chromium_crates_io/vendor/bytemuck-v1.orig/changelog.md third_party/rust/chromium_crates_io/vendor/bytemuck-v1/changelog.md
+--- third_party/rust/chromium_crates_io/vendor/bytemuck-v1.orig/changelog.md	2026-01-06 08:20:51.000000000 +0900
++++ third_party/rust/chromium_crates_io/vendor/bytemuck-v1/changelog.md	2026-04-23 04:39:29.861477000 +0900
+@@ -1,5 +1,16 @@
+ # `bytemuck` changelog
+ 
++## 1.25
++
++* [Remove extern "stdcall" fn ptr impls on non-x86-32 windows.](https://github.com/Lokathor/bytemuck/pull/333)
++* [Fix nightly_portable_simd after LaneCount removal.](https://github.com/Lokathor/bytemuck/pull/344)
++
++## 1.24
++
++* [use new stable avx512 types from rust 1.89](https://github.com/Lokathor/bytemuck/pull/322)
++* [impl AnyBitPattern for [MaybeUninit<T: AnyBitPattern>; N]](https://github.com/Lokathor/bytemuck/pull/317)
++* bump `derive` minimum version.
++
+ ## 1.23.2
+ 
+ * bump `derive` minimum version.
+diff -audpNr third_party/rust/chromium_crates_io/vendor/bytemuck-v1.orig/rustfmt.toml third_party/rust/chromium_crates_io/vendor/bytemuck-v1/rustfmt.toml
+--- third_party/rust/chromium_crates_io/vendor/bytemuck-v1.orig/rustfmt.toml	2026-01-06 08:20:51.000000000 +0900
++++ third_party/rust/chromium_crates_io/vendor/bytemuck-v1/rustfmt.toml	2026-04-23 04:39:29.861581000 +0900
+@@ -3,7 +3,7 @@ edition = "2018"
+ 
+ # Stable
+ edition = "2018"
+-fn_args_layout = "Compressed"
++fn_params_layout = "Compressed"
+ max_width = 80
+ tab_spaces = 2
+ use_field_init_shorthand = true
+diff -audpNr third_party/rust/chromium_crates_io/vendor/bytemuck-v1.orig/src/anybitpattern.rs third_party/rust/chromium_crates_io/vendor/bytemuck-v1/src/anybitpattern.rs
+--- third_party/rust/chromium_crates_io/vendor/bytemuck-v1.orig/src/anybitpattern.rs	2026-01-06 08:20:51.000000000 +0900
++++ third_party/rust/chromium_crates_io/vendor/bytemuck-v1/src/anybitpattern.rs	2026-04-23 04:39:29.861735000 +0900
+@@ -62,3 +62,16 @@ unsafe impl<T> AnyBitPattern for core::mem::MaybeUnini
+ )]
+ unsafe impl<T> AnyBitPattern for core::mem::MaybeUninit<T> where T: AnyBitPattern
+ {}
++
++#[cfg(all(feature = "zeroable_maybe_uninit", feature = "min_const_generics"))]
++#[cfg_attr(
++  feature = "nightly_docs",
++  doc(cfg(all(
++    feature = "zeroable_maybe_uninit",
++    feature = "min_const_generics"
++  )))
++)]
++unsafe impl<T, const N: usize> AnyBitPattern for [core::mem::MaybeUninit<T>; N] where
++  T: AnyBitPattern
++{
++}
+diff -audpNr third_party/rust/chromium_crates_io/vendor/bytemuck-v1.orig/src/lib.rs third_party/rust/chromium_crates_io/vendor/bytemuck-v1/src/lib.rs
+--- third_party/rust/chromium_crates_io/vendor/bytemuck-v1.orig/src/lib.rs	2026-01-06 08:20:51.000000000 +0900
++++ third_party/rust/chromium_crates_io/vendor/bytemuck-v1/src/lib.rs	2026-04-23 04:39:29.861767000 +0900
+@@ -5,16 +5,10 @@
+ #![allow(clippy::uninlined_format_args)]
+ #![allow(clippy::result_unit_err)]
+ #![allow(clippy::type_complexity)]
++#![allow(clippy::manual_is_multiple_of)]
+ #![cfg_attr(feature = "nightly_docs", feature(doc_cfg))]
+ #![cfg_attr(feature = "nightly_portable_simd", feature(portable_simd))]
+ #![cfg_attr(feature = "nightly_float", feature(f16, f128))]
+-#![cfg_attr(
+-  all(
+-    feature = "nightly_stdsimd",
+-    any(target_arch = "x86_64", target_arch = "x86")
+-  ),
+-  feature(stdarch_x86_avx512)
+-)]
+ 
+ //! This crate gives small utilities for casting between plain data types.
+ //!
+@@ -569,7 +563,7 @@ pub fn fill_zeroes<T: Zeroable>(slice: &mut [T]) {
+     // case one of the intermediate drops does a panic.
+     slice.iter_mut().for_each(write_zeroes);
+   } else {
+-    // Otherwise we can be really fast and just fill everthing with zeros.
++    // Otherwise we can be really fast and just fill everything with zeros.
+     let len = slice.len();
+     unsafe { core::ptr::write_bytes(slice.as_mut_ptr(), 0u8, len) }
+   }
+diff -audpNr third_party/rust/chromium_crates_io/vendor/bytemuck-v1.orig/src/must.rs third_party/rust/chromium_crates_io/vendor/bytemuck-v1/src/must.rs
+--- third_party/rust/chromium_crates_io/vendor/bytemuck-v1.orig/src/must.rs	2026-01-06 08:20:51.000000000 +0900
++++ third_party/rust/chromium_crates_io/vendor/bytemuck-v1/src/must.rs	2026-04-23 04:39:29.861776000 +0900
+@@ -114,7 +114,7 @@ maybe_const_fn! {
+ /// ## Failure
+ ///
+ /// * If the target type has a greater alignment requirement.
+-/// * If the target element type doesn't evenly fit into the the current element
++/// * If the target element type doesn't evenly fit into the current element
+ ///   type (eg: 3 `u16` values is 1.5 `u32` values, so that's a failure).
+ /// * Similarly, you can't convert from a non-[ZST](https://doc.rust-lang.org/nomicon/exotic-sizes.html#zero-sized-types-zsts)
+ ///   to a ZST (e.g. 3 `u8` values is not any number of `()` values).
+diff -audpNr third_party/rust/chromium_crates_io/vendor/bytemuck-v1.orig/src/pod.rs third_party/rust/chromium_crates_io/vendor/bytemuck-v1/src/pod.rs
+--- third_party/rust/chromium_crates_io/vendor/bytemuck-v1.orig/src/pod.rs	2026-01-06 08:20:51.000000000 +0900
++++ third_party/rust/chromium_crates_io/vendor/bytemuck-v1/src/pod.rs	2026-04-23 04:39:29.861727000 +0900
+@@ -143,6 +143,7 @@ impl_unsafe_marker_for_simd!(
+   }
+ );
+ 
++#[rustversion::before(2026-01-27)] // See https://github.com/Lokathor/bytemuck/issues/343
+ #[cfg(feature = "nightly_portable_simd")]
+ #[cfg_attr(
+   feature = "nightly_docs",
+@@ -151,33 +152,44 @@ where
+ unsafe impl<T, const N: usize> Pod for core::simd::Simd<T, N>
+ where
+   T: core::simd::SimdElement + Pod,
+-  core::simd::LaneCount<N>: core::simd::SupportedLaneCount,
+ {
+ }
+ 
++#[rustversion::since(2026-01-27)] // See https://github.com/Lokathor/bytemuck/issues/343
++#[cfg(feature = "nightly_portable_simd")]
++#[cfg_attr(
++  feature = "nightly_docs",
++  doc(cfg(feature = "nightly_portable_simd"))
++)]
++unsafe impl<T, const N: usize> Pod for core::simd::Simd<T, N>
++where
++  T: core::simd::SimdElement + Pod,
++{
++}
++
+ impl_unsafe_marker_for_simd!(
+-  #[cfg(all(target_arch = "x86", any(feature = "nightly_stdsimd", feature = "avx512_simd")))]
++  #[cfg(all(target_arch = "x86", feature = "avx512_simd"))]
+   unsafe impl Pod for x86::{
+     __m512, __m512d, __m512i
+   }
+ );
+ 
+ impl_unsafe_marker_for_simd!(
+-  #[cfg(all(target_arch = "x86_64", any(feature = "nightly_stdsimd", feature = "avx512_simd")))]
++  #[cfg(all(target_arch = "x86_64", feature = "avx512_simd"))]
+   unsafe impl Pod for x86_64::{
+     __m512, __m512d, __m512i
+   }
+ );
+ 
+ impl_unsafe_marker_for_simd!(
+-  #[cfg(all(target_arch = "x86", feature = "nightly_stdsimd"))]
++    #[cfg(all(target_arch = "x86", feature = "avx512_simd"))]
+   unsafe impl Pod for x86::{
+     __m128bh, __m256bh, __m512bh
+   }
+ );
+ 
+ impl_unsafe_marker_for_simd!(
+-  #[cfg(all(target_arch = "x86_64", feature = "nightly_stdsimd"))]
++    #[cfg(all(target_arch = "x86_64", feature = "avx512_simd"))]
+   unsafe impl Pod for x86_64::{
+     __m128bh, __m256bh, __m512bh
+   }
+diff -audpNr third_party/rust/chromium_crates_io/vendor/bytemuck-v1.orig/src/zeroable.rs third_party/rust/chromium_crates_io/vendor/bytemuck-v1/src/zeroable.rs
+--- third_party/rust/chromium_crates_io/vendor/bytemuck-v1.orig/src/zeroable.rs	2026-01-06 08:20:51.000000000 +0900
++++ third_party/rust/chromium_crates_io/vendor/bytemuck-v1/src/zeroable.rs	2026-04-23 04:39:29.861812000 +0900
+@@ -222,6 +222,7 @@ impl_unsafe_marker_for_simd!(
+     }
+ );
+ 
++#[rustversion::before(2026-01-27)] // See https://github.com/Lokathor/bytemuck/issues/343
+ #[cfg(feature = "nightly_portable_simd")]
+ #[cfg_attr(
+   feature = "nightly_docs",
+@@ -230,33 +231,44 @@ where
+ unsafe impl<T, const N: usize> Zeroable for core::simd::Simd<T, N>
+ where
+   T: core::simd::SimdElement + Zeroable,
+-  core::simd::LaneCount<N>: core::simd::SupportedLaneCount,
+ {
+ }
+ 
++#[rustversion::since(2026-01-27)] // See https://github.com/Lokathor/bytemuck/issues/343
++#[cfg(feature = "nightly_portable_simd")]
++#[cfg_attr(
++  feature = "nightly_docs",
++  doc(cfg(feature = "nightly_portable_simd"))
++)]
++unsafe impl<T, const N: usize> Zeroable for core::simd::Simd<T, N>
++where
++  T: core::simd::SimdElement + Zeroable,
++{
++}
++
+ impl_unsafe_marker_for_simd!(
+-  #[cfg(all(target_arch = "x86", any(feature = "nightly_stdsimd", feature = "avx512_simd")))]
++  #[cfg(all(target_arch = "x86", feature = "avx512_simd"))]
+   unsafe impl Zeroable for x86::{
+     __m512, __m512d, __m512i
+   }
+ );
+ 
+ impl_unsafe_marker_for_simd!(
+-  #[cfg(all(target_arch = "x86_64", any(feature = "nightly_stdsimd", feature = "avx512_simd")))]
++  #[cfg(all(target_arch = "x86_64", feature = "avx512_simd"))]
+   unsafe impl Zeroable for x86_64::{
+     __m512, __m512d, __m512i
+   }
+ );
+ 
+ impl_unsafe_marker_for_simd!(
+-  #[cfg(all(target_arch = "x86", feature = "nightly_stdsimd"))]
++  #[cfg(all(target_arch = "x86",  feature = "avx512_simd"))]
+   unsafe impl Zeroable for x86::{
+     __m128bh, __m256bh, __m512bh
+   }
+ );
+ 
+ impl_unsafe_marker_for_simd!(
+-  #[cfg(all(target_arch = "x86_64", feature = "nightly_stdsimd"))]
++  #[cfg(all(target_arch = "x86_64", feature = "avx512_simd"))]
+   unsafe impl Zeroable for x86_64::{
+     __m128bh, __m256bh, __m512bh
+   }
+diff -audpNr third_party/rust/chromium_crates_io/vendor/bytemuck-v1.orig/src/zeroable_in_option.rs third_party/rust/chromium_crates_io/vendor/bytemuck-v1/src/zeroable_in_option.rs
+--- third_party/rust/chromium_crates_io/vendor/bytemuck-v1.orig/src/zeroable_in_option.rs	2026-01-06 08:20:51.000000000 +0900
++++ third_party/rust/chromium_crates_io/vendor/bytemuck-v1/src/zeroable_in_option.rs	2026-04-23 04:39:29.861801000 +0900
+@@ -52,9 +52,9 @@ macro_rules! impl_for_fn {
+         unsafe impl<$($ArgTy,)* R> ZeroableInOption for unsafe extern "C" fn($($ArgTy,)*) -> R {}
+         unsafe impl<$($ArgTy,)* R> ZeroableInOption for extern "system" fn($($ArgTy,)*) -> R {}
+         unsafe impl<$($ArgTy,)* R> ZeroableInOption for unsafe extern "system" fn($($ArgTy,)*) -> R {}
+-        #[cfg(target_os="windows")]
++        #[cfg(all(target_os="windows", target_arch = "x86"))]
+         unsafe impl<$($ArgTy,)* R> ZeroableInOption for extern "stdcall" fn($($ArgTy,)*) -> R {}
+-        #[cfg(target_os="windows")]
++        #[cfg(all(target_os="windows", target_arch = "x86"))]
+         unsafe impl<$($ArgTy,)* R> ZeroableInOption for unsafe extern "stdcall" fn($($ArgTy,)*) -> R {}
+         #[cfg(feature = "zeroable_unwind_fn")]
+         impl_for_unwind_fn!($($ArgTy),*);
+diff -audpNr third_party/rust/chromium_crates_io/vendor/bytemuck-v1.orig/tests/std_tests.rs third_party/rust/chromium_crates_io/vendor/bytemuck-v1/tests/std_tests.rs
+--- third_party/rust/chromium_crates_io/vendor/bytemuck-v1.orig/tests/std_tests.rs	2026-01-06 08:20:51.000000000 +0900
++++ third_party/rust/chromium_crates_io/vendor/bytemuck-v1/tests/std_tests.rs	2026-04-23 04:39:29.861503000 +0900
+@@ -58,7 +58,7 @@ fn test_try_from_box_bytes() {
+ 
+   // Different layout: target alignment is less than source alignment.
+   assert_eq!(
+-    try_from_box_bytes::<u32>(Box::new(0u64).into()).map_err(|(x, _)| x),
++    try_from_box_bytes::<u16>(Box::new(0u64).into()).map_err(|(x, _)| x),
+     Err(PodCastError::AlignmentMismatch)
+   );
+