Macro sauron::h2

macro_rules! h2 {
    ( [$d($att: expr),*], [$d($children: expr),*] ) => { ... };
    ( [$d($att: expr),*], [$d($children: expr),*], ) => { ... };
    ( [$d($att: expr),*], [$d($children: expr,)*] ) => { ... };
    ( [$d($att: expr),*], [$d($children: expr,)*], ) => { ... };
    ( [$d($att: expr,)*], [$d($children: expr),*] ) => { ... };
    ( [$d($att: expr,)*], [$d($children: expr,)*], ) => { ... };
    ( [$d($att: expr,)*], [$d($children: expr,)*] ) => { ... };
    ( [$d($att: expr,)*], [$d($children: expr,)*], ) => { ... };
    ( $att: expr, $children: expr ) => { ... };
    ( $att: expr, $children: expr, ) => { ... };
}

TODO: