Roll nightly toolchain

Release 0.8.0-alpha.4.

Closes #844

.github/workflows/ci.yml

@@ -258,9 +258,15 @@ jobs:
         # Don't semver check zerocopy-derive; as a proc macro, it doesn't have
         # an API that cargo-semver-checks can understand.
         package: zerocopy
-        feature-group: all-features
+        # Don't test nightly features. The reason this doesn't work is that
+        # cargo-semver-checks works relative to the most recently-published
+        # stable release on crates.io. The pinned nightly toolchain may be
+        # incompatible with the unstable features on that published release, as
+        # nightly features may have changed since it was released. Luckily, we
+        # don't care about the API stability of these features anyway.
+        features: __internal_use_only_features_that_work_on_stable
         rust-toolchain: ${{ env.ZC_TOOLCHAIN }}
-      if: matrix.crate == 'zerocopy' && matrix.features == '--all-features' && matrix.toolchain == 'nightly'
+      if: matrix.crate == 'zerocopy' && matrix.features == '--features __internal_use_only_features_that_work_on_stable' && matrix.toolchain == 'nightly'
 
   kani:
     runs-on: ubuntu-latest        
@@ -269,7 +275,17 @@ jobs:
       - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
       - uses: model-checking/kani-github-action@f838096619a707b0f6b2118cf435eaccfa33e51f # v1.1
         with:
-          args: "--package zerocopy --all-features --output-format=terse --randomize-layout --memory-safety-checks --overflow-checks --undefined-function-checks --unwinding-checks"
+          # Use `--features __internal_use_only_features_that_work_on_stable`
+          # because the Kani GitHub Action uses its own pinned nightly
+          # toolchain. Sometimes, we make changes to our nightly features for
+          # more recent toolchains, and so our nightly features become
+          # incompatible with the toolchain that Kani uses. By only testing
+          # stable features, we ensure that this doesn't cause problems in CI.
+          #
+          # TODO(https://github.com/model-checking/kani-github-action/issues/56):
+          # Go back to testing all features once the Kani GitHub Action supports
+          # specifying a particular toolchain.
+          args: "--package zerocopy --features __internal_use_only_features_that_work_on_stable --output-format=terse --randomize-layout --memory-safety-checks --overflow-checks --undefined-function-checks --unwinding-checks"
 
   check_fmt:
     runs-on: ubuntu-latest

Cargo.toml

@@ -15,7 +15,7 @@
 [package]
 edition = "2018"
 name = "zerocopy"
-version = "0.8.0-alpha.3"
+version = "0.8.0-alpha.4"
 authors = ["Joshua Liebow-Feeser <joshlf@google.com>"]
 description = "Utilities for zero-copy parsing and serialization"
 license = "BSD-2-Clause OR Apache-2.0 OR MIT"
@@ -31,7 +31,7 @@ rustdoc-args = ["--cfg", "doc_cfg", "--generate-link-to-definition"]
 [package.metadata.ci]
 # The versions of the stable and nightly compiler toolchains to use in CI.
 pinned-stable = "1.75.0"
-pinned-nightly = "nightly-2024-02-01"
+pinned-nightly = "nightly-2024-02-06"
 
 [package.metadata.playground]
 features = ["__internal_use_only_features_that_work_on_stable"]
@@ -47,13 +47,13 @@ simd-nightly = ["simd"]
 __internal_use_only_features_that_work_on_stable = ["alloc", "derive", "simd"]
 
 [dependencies]
-zerocopy-derive = { version = "=0.8.0-alpha.3", path = "zerocopy-derive", optional = true }
+zerocopy-derive = { version = "=0.8.0-alpha.4", path = "zerocopy-derive", optional = true }
 
 # The "associated proc macro pattern" ensures that the versions of zerocopy and
 # zerocopy-derive remain equal, even if the 'derive' feature isn't used.
 # See: https://github.com/matklad/macro-dep-test
 [target.'cfg(any())'.dependencies]
-zerocopy-derive = { version = "=0.8.0-alpha.3", path = "zerocopy-derive" }
+zerocopy-derive = { version = "=0.8.0-alpha.4", path = "zerocopy-derive" }
 
 [dev-dependencies]
 assert_matches = "1.5"
@@ -72,6 +72,6 @@ testutil = { path = "testutil" }
 # CI test failures.
 trybuild = { version = "=1.0.89", features = ["diff"] }
 # In tests, unlike in production, zerocopy-derive is not optional
-zerocopy-derive = { version = "=0.8.0-alpha.3", path = "zerocopy-derive" }
+zerocopy-derive = { version = "=0.8.0-alpha.4", path = "zerocopy-derive" }
 # TODO(#381) Remove this dependency once we have our own layout gadgets.
 elain = "0.3.0"

src/lib.rs

@@ -219,7 +219,18 @@
     clippy::indexing_slicing,
 ))]
 #![cfg_attr(not(test), no_std)]
-#![cfg_attr(feature = "simd-nightly", feature(stdsimd))]
+#![cfg_attr(
+    all(feature = "simd-nightly", any(target_arch = "x86", target_arch = "x86_64")),
+    feature(stdarch_x86_avx512)
+)]
+#![cfg_attr(
+    all(feature = "simd-nightly", target_arch = "arm"),
+    feature(stdarch_arm_dsp, stdarch_arm_neon_intrinsics)
+)]
+#![cfg_attr(
+    all(feature = "simd-nightly", any(target_arch = "powerpc", target_arch = "powerpc64")),
+    feature(stdarch_powerpc)
+)]
 #![cfg_attr(doc_cfg, feature(doc_cfg))]
 #![cfg_attr(
     __INTERNAL_USE_ONLY_NIGHLTY_FEATURES_IN_TESTS,

zerocopy-derive/Cargo.toml

@@ -9,7 +9,7 @@
 [package]
 edition = "2018"
 name = "zerocopy-derive"
-version = "0.8.0-alpha.3"
+version = "0.8.0-alpha.4"
 authors = ["Joshua Liebow-Feeser <joshlf@google.com>"]
 description = "Custom derive for traits from the zerocopy crate"
 license = "BSD-2-Clause OR Apache-2.0 OR MIT"