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    //! Utility macros.

    #[allow(unused)]
    macro_rules! types {
        ($(
            $(#[$doc:meta])*
            pub struct $name:ident($($fields:tt)*);
        )*) => ($(
            $(#[$doc])*
            #[derive(Copy, Clone, Debug)]
            #[allow(non_camel_case_types)]
            #[repr(simd)]
            pub struct $name($($fields)*);
        )*)
    }

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