Macro core::tuple::lexical_ord

macro_rules! lexical_ord {
    ($rel: ident, $ne_rel: ident, $a:expr, $b:expr, $($rest_a:expr, $rest_b:expr),+) => { ... };
    ($rel: ident, $ne_rel: ident, $a:expr, $b:expr) => { ... };
}