fix(plt-147): pin ahash=0.8.11 and ppv-lite86=0.2.20 to avoid zerocopy 0.8.x E0658 - #35
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…y 0.8.x zerocopy 0.8.x (pulled in by ahash 0.8.12 and ppv-lite86 0.2.21) uses AVX-512 intrinsics guarded by the stdarch_x86_avx512 nightly feature. On stable Rust the compiler rejects these with E0658 even when the target does not support AVX-512. Pinning to older versions eliminates zerocopy 0.8.x entirely from the dependency tree. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Problem
zerocopy 0.8.48(pulled in transitively viaahash 0.8.12andppv-lite86 0.2.21) includes AVX-512 SIMD imports (__m512ietc.) guarded by thestdarch_x86_avx512nightly feature. On stable Rust the compiler rejects these with E0658 even when the target does not support AVX-512, because zerocopy'sbuild.rsgates the code by Rust version (≥ 1.89.0), notcfg(target_feature).Dependency chains
Fix
Pin
ahash = "=0.8.11"andppv-lite86 = "=0.2.20". Both older versions depend onzerocopy ^0.7(not 0.8.x), eliminating the E0658 code path entirely.Closes PLT-147
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