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

[Artur Malabarba]

>> 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.

Given that the last test of while is always nil, it could return the
result of the last body (or nil if body was never run). That's what I
wished it did the several times when I ran into this limitation,
though “annoys me to no end” /was/ a gross exageration. :)