conc does not rewrite N if N is an empty list. # 1. : (let (N '()) (conc N '(A))) -> (A) # 2 : (let (N '()) (conc N '(A)) N) -> NIL # 3. : (let (N '(NIL)) (conc N '(A)) N) -> (NIL A) # 4. : (let (N '()) (setq N (conc N '(A))) N) -> (A)
In #2 above, I was expecting N to be (A) If N is not empty, as in #3 it works as expected, or I can force the assignment, as in #4... which shouldn't be necessary. Originally I wanted to do: : (let (N '()) (for X 10 (conc N '(A))) N) -> NIL # expected '(A A A A A A A A A A) ..and this goes into never land. [kill -9] (let (N '()) (for X 10 (setq N (conc N '(A)))) N) /Lindsay
