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From: Emanuel Berg <incal@dataswamp.org>
To: help-gnu-emacs@gnu.org
Subject: Re: unused lexical variable in `cl-loop'
Date: Sat, 01 Oct 2022 00:59:01 +0200	[thread overview]
Message-ID: <87edvscvuy.fsf@dataswamp.org> (raw)
In-Reply-To: 87r0zv3c4w.fsf@sperrhaken.name

Felix Dietrich wrote:

>   (cl-block nil
>     (let*
>         ((i min)
>          (--cl-var-- max)
>          (num nil)
>          (num nil))
>       (while
>           (<= i --cl-var--)
>         (setq num
>               (nconc num
>                      (list i)))
>         (setq i
>               (+ i 1)))
>       num))
>
> The variable ‘num’ is bound twice

That's right, if you bind the same lexical/static variable
more than once you get the "Unused lexical variable" warning
for every occasion and it doesn't matter if it's used or not.

(let ((one 1)  
      (one 1) )
  one)

;; Warning: Unused lexical variable `one'
;; Warning: Unused lexical variable `one'

But if you do this ...

(let ((one 1)
      (one 2) )
  one)

You only get a warning for the first one ...

;; Warning: Unused lexical variable `one'

-- 
underground experts united
https://dataswamp.org/~incal




  reply	other threads:[~2022-09-30 22:59 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-09-27 20:43 unused lexical variable in `cl-loop' Emanuel Berg
2022-09-28 10:58 ` Michael Heerdegen
2022-09-28 12:40 ` Felix Dietrich
2022-09-30 22:59   ` Emanuel Berg [this message]
2022-10-01 15:10     ` Stefan Monnier via Users list for the GNU Emacs text editor

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