[_ph_]

SKILL++ is actually a pretty compliant Scheme, with a lot of compatibility to SKILL and quite a bit of Common Lisp added on top. What makes it a bit funny is the clever parser, which allows both prefix syntax as in

(setq x (plus a b))

as well as

x = a + b

(which just reads as the former expression). Personally, I prefer the Lisp style much - except for math expressions.