GNU bug report logs - #23795
24.5; rx eval on variable gives symbol error

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Package: emacs;

Reported by: bgoodr <at> gmail.com

Date: Sat, 18 Jun 2016 15:51:01 UTC

Severity: normal

Found in version 24.5

Done: Andreas Schwab <schwab <at> linux-m68k.org>

Bug is archived. No further changes may be made.

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Message #16 received at 23795-done <at> debbugs.gnu.org (full text, mbox):

From: Andreas Schwab <schwab <at> linux-m68k.org>
To: bgoodr <at> gmail.com
Cc: 23795-done <at> debbugs.gnu.org
Subject: Re: bug#23795: 24.5; rx eval on variable gives symbol error
Date: Sat, 18 Jun 2016 18:19:03 +0200

bgoodr <at> gmail.com writes:

> Insert this into a .el file and load it in using emacs -Q:
>
> (let ((page-name "the page"))
>        (let ((regexp
> 	      ;; (concat "[[" page-name "]]")
> 	      (rx "[[" (eval page-name) "]]" )))
> 	 regexp
> 	 ))

Since rx is a macro it cannot refer to runtime values.  You need to use
rx-to-string to construct the regexp at run time.  Or just use concat as
in the comment.

Andreas.

-- 
Andreas Schwab, schwab <at> linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."
This bug report was last modified 9 years and 28 days ago.

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