Macro chain_traverse 

macro_rules! chain_traverse {
    (
        $input_indices:ident, $match_indices:ident,
        $hash_values:ident, $next_chain:ident,
        $input_idx:ident, $chain_idx:ident, $remaining_output:ident, $one:ident, $zero:ident
    ) => { ... };
}