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features! {
    @TARGET: arm;
    @MACRO_NAME: is_arm_feature_detected;
    @MACRO_ATTRS:
    
    #[unstable(feature = "stdsimd", issue = "27731")]
    @NO_RUNTIME_DETECTION: "v7";
    @NO_RUNTIME_DETECTION: "vfp2";
    @NO_RUNTIME_DETECTION: "vfp3";
    @NO_RUNTIME_DETECTION: "vfp4";
    @FEATURE: #[unstable(feature = "stdsimd", issue = "27731")] neon: "neon";
    
    @FEATURE: #[unstable(feature = "stdsimd", issue = "27731")] pmull: "pmull";
    
    @FEATURE: #[unstable(feature = "stdsimd", issue = "27731")] crc: "crc";
    
    @FEATURE: #[unstable(feature = "stdsimd", issue = "27731")] crypto: "crypto";
    
}