Except "_" is a perfectly good name for a symbol in Arc. "nil" could be used instead, since nil isn't allowed to be rebound. (let (x . nil) '(a b c) x) eve

Except "_" is a perfectly good name for a symbol in Arc. "nil" could be used instead, since nil isn't allowed to be rebound. (let (x . nil) '(a b c) x) even works already, since (unless it's been changed in some newer version of Arc I haven't installed yet) Arc just silently ignores the let-ing of nil: (let nil t nil) ---> nil