Macro molt_forked::join_helps_subcmd

macro_rules! join_helps_subcmd {
    (  ) => { ... };
    ( [$first:expr, $second:expr, $third:expr]$(,)? ) => { ... };
    ( [$first:expr, $second:expr, $third:expr], $( [$rest_first:expr, $rest_second:expr, $rest_third:expr] ),+$(,)? ) => { ... };
}