hello all!I'm trying to bind f6 key to toggle 'pop-up-frames' variable by
insert following line in my .emacs file:

(global-set-key [f6] (lambda () (setq pop-up-frames (not pop-up-frames)))

and after restart emacs and press f6, emacs says "Wrong type argument:
commandp, (lambda nil (setq pop-up-frames (not pop-up-frames)))"

please give me some help, thanks!

tiefeng wu
2009--7-12