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rust-lang/stdarch#1573 stabilized the `stdarch_arm_crc32` feature, meaning that it's no longer necessary to enable it to get ARM CRC intrinsics, and doing so in the latest nightlies causes compile errors to happen. Let's get rid of that removed unstable feature and update the documentation accordingly.
This moves the gating for such specializations from nightly builds to Rust 1.80+, bringing back a small build script for rustc version detection.
This metadata key is ignored by older Rust versions, but honored by newer versions to provide better diagnostics and dependency resolution.
This was referenced Jun 29, 2025
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