On Thu, Jan 26, 2023 at 12:21:31PM +0900, Kazu Yamamoto (山本和彦) via Haskell-Cafe wrote: > > I feel I should raise the naive question, what if args is wrong? > > The length of "args" have been checked in advance. > I'm sure that the length is 2. Then, at the point you check the args, put them in a pair?