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From: Alexander Shukaev <haroogan@gmail.com>
To: John Mastro <john.b.mastro@gmail.com>
Cc: help-gnu-emacs <help-gnu-emacs@gnu.org>
Subject: Re: Macro Expansion Inconsistency
Date: Tue, 16 Dec 2014 23:58:32 +0100	[thread overview]
Message-ID: <CAKu-7Wwqk_14hSUGjLwHs8c6p4EGFpZu1X-fnqMq=iHpJ1VQ+w@mail.gmail.com> (raw)
In-Reply-To: <CAOj2CQRHewiAS88-bXXDcFR13H42Xsk4rQnF999-bubDqSE8yQ@mail.gmail.com>

>
>     (defmacro test (name)
>       `(let* ((name ',name)
>               (symbol (intern (concat "some" "-" (symbol-name name)))))
>          ,symbol))
>          ^^^^^^^
>
> The comma operator causes something to be evaluated when the macro is
> expanded, but the `symbol' binding doesn't exist until runtime (at which
> time it exists where the macro expanded, not within the macro's body).
>
> This is another version that will work (notice the lack of quoting):
>
>     (defmacro test (name)
>       (let ((symbol (intern (concat "some" "-" (symbol-name name)))))
>         symbol))
>

Yes, I get it, but then how do I do something like

(defmacro test
    (name)
  `(let* ((name             ',name))
     (defvar ,(intern (concat "some" "-" (symbol-name name))))))

but using variable `symbol'?


  reply	other threads:[~2014-12-16 22:58 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <mailman.16228.1418763453.1147.help-gnu-emacs@gnu.org>
2014-12-16 21:10 ` Macro Expansion Inconsistency Joost Kremers
2014-12-16 21:25   ` Alexander Shukaev
2014-12-16 21:46     ` John Mastro
2014-12-16 22:58       ` Alexander Shukaev [this message]
2014-12-16 23:14         ` Alexander Shukaev
2014-12-17  2:19           ` Alexander Shukaev
2014-12-17 10:04             ` Nicolas Richard
2014-12-17 14:03               ` Alexander Shukaev
2014-12-17 14:20                 ` Stefan Monnier
2014-12-17 14:34                   ` Alexander Shukaev
2014-12-17 14:21                 ` Nicolas Richard
2014-12-17 14:52                   ` Alexander Shukaev
2014-12-17 14:58                     ` Nicolas Richard
2014-12-17 15:14                       ` Alexander Shukaev
     [not found]               ` <mailman.16290.1418825041.1147.help-gnu-emacs@gnu.org>
2014-12-17 15:53                 ` Barry Margolin
2014-12-17 16:01                   ` Alexander Shukaev
     [not found]           ` <mailman.16262.1418782759.1147.help-gnu-emacs@gnu.org>
2014-12-17  3:03             ` Rusi
2014-12-17  9:21               ` Nicolas Richard
2014-12-16 23:20         ` John Mastro
     [not found]           ` <CAKu-7WzgoHH=zM_jxeVGMwzAne88nAoCUsLKQv9zUYo_amsjNg@mail.gmail.com>
2014-12-17  3:34             ` John Mastro
2014-12-17  3:41               ` John Mastro
2014-12-16 23:30   ` Stefan Monnier
2014-12-16 20:57 Alexander Shukaev

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