What the Heck is Tortelvis?
Tortelvis is agile 130 kg strong Elvis impersonator singer of Dread Zeppelin,
the band that plays Led Zeppelin covers in a reggae style. Definitely
fascinating. But, sometimes, you do not want the copy, you want the real thing.
Look here:
> (set 'L (list 1 2 3)) (1 2 3) > (set 'push-right (lambda(a b)(push a b -1))) (lambda (a b) (push a b -1)) > (push-right 4 L) (1 2 3 4) > L (1 2 3)
Did you expected (1 2 3 4)? Well, Newlisp is sometimes too functional. This
time it passed copy of L to the push-right. OK, we'll fix it now.
> (set 'push-right (lambda-macro(a b)(eval (expand '(push a b -1) 'a 'b)))) (lambda-macro (a b) (eval (expand '(push a b -1) 'a 'b))) > (push-right 5 L) (1 2 3 5) > L (1 2 3 5)
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