Macro panorama_proto_common::sep_list

macro_rules! sep_list {
    ($t : expr) => { ... };
    ($t : expr, $d : expr) => { ... };
    (? $t : expr) => { ... };
    (? $t : expr, $d : expr) => { ... };
}

sep_list!(t, d) represents t *(d t) and automatically collapses it into Vec<T>.

Also sep_list!(?t, d) represents [t *(d t)] and will default to an empty vec.

If d is not passed then it defaults to SP.