Re: [Emacs-diffs] master e224c94: * lisp/emacs-lisp/seq.el (seq-doseq): Tighten the code

[Stefan Monnier]

>> +       ;; FIXME: Do we really want to support this?
>> +       ,@(cddr spec))))

> Why wouldn't we want to support this?
> It's not only useful, it is also consistent with `dolist'.

I find

   (dolist (a b)
     (body))
   c)

much more readable than

   (dolist (a b c)
     (body))

Especially when `b' is non-trivial.

> I agree.  It's a very useful feature.

"Very useful" sounds grossly exaggerated.

> It annoys me to no end that `while` always returns nil.

But there's not much else it can do.  I think you want to define `until'
instead, since that one could return something (the non-nil value being
tested) occasionally useful.


        Stefan