Hi Tomas,

On 10/4/10 7:27 PM, Tomas Hlavaty wrote:
..
For example, even simple 'if' is implemented as a picolisp fexpr:

   (de if (C . L)
      (loop
         (T C (up. '@ @) (eval (car L) 1))
         (T T (run (cdr L) 1)) ) )
..

I'm just curious, what does that 'up.' do? I can't find it in the PicoLisp ref.

/Jon
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