Macro impl_one_zero

Source
macro_rules! impl_one_zero {
    ([$($bound:tt)*]; $t:ty; zero: $e:expr; $($rest:tt)*) => { ... };
    ([$($bound:tt)*]; $t:ty; one: $e:expr; $($rest:tt)*) => { ... };
    ([$($bound:tt)*]; $t:ty;) => { ... };
    ($t:ty; $($rest:tt)*) => { ... };
}
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