Macro std::is_arm_feature_detected

macro_rules! is_arm_feature_detected {
    ($t : tt) => { ... };
}

???? This is a nightly-only experimental API. (stdsimd #27731)

Prevents compilation if is_arm_feature_detected is used somewhere else than ARM targets.

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Licensed under the Apache License, Version 2.0 or the MIT license, at your option.
https://doc.rust-lang.org/std/macro.is_arm_feature_detected.html