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1 point by fallintothis 4529 days ago | link | parent

Per the comment above ar-false?

  ; definition of falseness for Arc if.
  ; must include '() since sometimes Arc functions see
  ; Scheme lists (e.g. . body of a macro).
So '() is ar-false? to interact nicely with Scheme. Notice #f is ar-false?, too.

I don't think there's much to it: pg just seems to prefer to spell the empty list nil instead of (). The only place I can think of where these different spellings are useful is in argument lists. That is, I prefer

  (def f () something)

  (def f nil something)
Otherwise, I'm used to nil, though I'd probably get used to () just as well.