> From: Yi DAI <plm....@gmail.com> > > I don't see the point why Scheme provides the general > `and' and `or' as primitive macros (which does stand > in our way when we wanna (apply and things) instead > of primitive procedures. For efficiency?
This suggestion was thought of and rejected dozens of times before you were born. The present behaviour is correct according to all previous versions of the Scheme report and Lisp 1.5 if I recall correctly. > If anyone can give a reasonable explanation, I may > buy it. Otherwise, I will go with my version in the > future. And I suggest Guile or the standard committee > fix this annoying `bug' of Scheme. A procedure evaluates all of its arguments in unspecified order before binding their values to parameters and evaluating its body. QED You can do what you want, in particular you can easily write |and?| and |or?| procedures, but if you persist in trying to put this change into Guile, Scheme, or most any other dialect of Lisp, we shall be forced to taunt you. -- Keith
