Re: Why is there no `until' in elisp?

[Paul Eggert]

On 10/17/18 2:15 PM, Garreau, Alexandre wrote:
> “while” as used in natural language does *not* mean the same thing

Yes, of course. And the same is true for "until". But I'm not objecting 
to the keyword's spelling: I'm objecting to a syntax where a condition C 
is placed immediately before a place where C is false. This is 
confusing! When I read "C" I should be mentally thinking "OK, now C is 
true". This is elementary notation design.


> It is still more natural and meaningful to say “until I’m not hungry
> anymore I eat” instead of “while I’m hungry I eat”,

Not at all. Most English-speakers would say that the latter is far more 
readable.


> > the Elisp syntax for the proposed loop construct should *not* be
> > (until C S).
> And what should it be then?
Why not use cl-loop? Although it's not perfect it's good enough, and 
it's better than introducing a seemingly-simple but deeply confusing syntax.