Re: why undefined return values?

[Mikael Djurfeldt <mdj at mdj dot nada dot kth dot se>]

Ken Anderson <kanderso@bbn.com> writes:

> I have no problem with nesting let and and:
> 
> (let ((eof (eof)))
>   (and (not eof) 
>        (let ((match (find-match regexp)))
> 	 (and match
> 	      (let ((str (car match)))
> 		...)))))
> 
> However, it can certainly get tedious if needed a lot.  Paul Graham's book On Lisp defines a macro, (aif) i think to support variations on this.  In fact, the book has 13 chapters on macros.

(use-modules (ice-9 and-let*))

:)