It sounds correct, but as you say, this is hard i to get right :(Fine; that means that they become: head-> s-expr head (append $1 $2) head-> s-expr (list $1)But wait - an "s-expr" can be a non-list (like a symbol), but "append" only takes lists as arguments, so the first production CAN'T be right. I think (append $1 $2) should be (cons $1 $2) instead. Can anyone confirm/deny this? Egil, you're the expert, I'd love to hear from you especially. Hehehe. No offence taken.BTW, I'm really _not_ beating up on Egil Möller. This stuff is surprisingly hard to get right. --
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