[nkassis]

I'm a newb or something but :

(cdr ()) makes it explode. What's nil? null nil don't exist

I do really like this. I was hoping for something like this where it would allow me to write lisp instead of javascript.

[hadronzoo]

  > (cdr '())
  => ()
  > (cdr (list­))
  => ()

[dfox]

well, (cdr ()) is an error in standard Scheme, as empty list is not pair.

[jcoglan]

I'll fix this so that invalid expressions are reported and car and cdr of () are errors.