const_struct 0.6.6

macro that allows const structures to be passed as const generics
Documentation 
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#[macro_export]
macro_rules! match_underscore {
    (_, $tt_is_underscore:expr) => {
        $tt_is_underscore
    };
    ($input:expr, $tt_is_underscore:expr) => {
        $input
    };
}