I tried conc to an empty list on both 32 and 64 bit versions of picolisp I even installed SBCL just to try the similar 'nconc' on that platform.
The results are consistent for all of them. I just don't understand why.... Is it simply 'standard', historical reasons? because of the way evaluation works? As it is, I would not be able to build a list 'destructively' without conditional logic for the initial empty list. conc works as expected when M is not empty. i.e M is rewritten. # -------------------------------------------- # Could also use NIL to represent the empty list ( http://software-lab.de/doc/ref.html#nilSym) : (setq M '() N '(A B C)) -> (A B C) : (conc M N) -> (A B C) : M -> NIL : N -> (A B C) # This is even weirder to me... # Again, I expected M, not N, to be rewritten : (setq M NIL N '(A B C) L '(1 2 3)) -> (1 2 3) : (conc M N L) -> (A B C 1 2 3) : M -> NIL : N -> (A B C 1 2 3) : L -> (1 2 3) # --------------------------------------------- /Lindsay
