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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)*);
        )*)
    }

    macro_rules! cfg_if {
        ($(
            if #[cfg($($meta:meta),*)] { $($it:item)* }
        ) else * else {
            $($it2:item)*
        }) => {
            __cfg_if_items! {
                () ;
                $( ( ($($meta),*) ($($it)*) ), )*
                ( () ($($it2)*) ),
            }
        };
        (
            if #[cfg($($i_met:meta),*)] { $($i_it:item)* }
            $(
                else if #[cfg($($e_met:meta),*)] { $($e_it:item)* }
            )*
        ) => {
            __cfg_if_items! {
                () ;
                ( ($($i_met),*) ($($i_it)*) ),
                $( ( ($($e_met),*) ($($e_it)*) ), )*
                ( () () ),
            }
        }
    }

    macro_rules! __cfg_if_items {
        (($($not:meta,)*) ; ) => {};
        (($($not:meta,)*) ; ( ($($m:meta),*) ($($it:item)*) ), $($rest:tt)*) => {
            __cfg_if_apply! { cfg(all($($m,)* not(any($($not),*)))), $($it)* }
            __cfg_if_items! { ($($not,)* $($m,)*) ; $($rest)* }
        }
    }

    macro_rules! __cfg_if_apply {
        ($m:meta, $($it:item)*) => {
            $(#[$m] $it)*
        }
    }

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