convert.erl

-module(convert).
-export([main/0, convert/1]).

main() ->
    [_,_] = convert({a,b}),
    {_,_} = convert([a,b]),
    [_,_] = convert([a,b]),
    {_,_} = convert({a,b}).

-spec convert(tuple()) -> list()
      ;      (list()) -> tuple().
convert(Tup) when is_tuple(Tup) -> tuple_to_list(Tup);
convert(L = [_|_]) -> list_to_tuple(L).