bug#23795: 24.5; rx eval on variable gives symbol error

bug#23795: 24.5; rx eval on variable gives symbol error

[bgoodr]

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
	 ))

Move point somewhere inside that expression and type C-M-x which is
bound to (eval-defun EDEBUG-IT). Get the error:

Debugger entered--Lisp error: (void-variable page-name)
  eval(page-name)
  rx-eval((eval page-name))
  rx-form((eval page-name) :)
  #[(x) "\301\b\302\"\207" [x rx-form :] 3]((eval page-name))
  mapconcat(#[(x) "\301\b\302\"\207" [x rx-form :] 3] ("[[" (eval page-name) "]]") nil)
  rx-and((and "[[" (eval page-name) "]]"))
  rx-form((and "[[" (eval page-name) "]]"))
  rx-to-string((and "[[" (eval page-name) "]]") t)
  #[(&rest regexps) "\b\204\b\0\301\302!\207\bA\203\x14\0\303\304\bB\305\"\207\303\b@\305\"\207" [regexps error "No regexp" rx-to-string and t] 3 ("/usr/share/emacs/24.5/lisp/emacs-lisp/rx.elc" . 19349)]("[[" (eval page-name) "]]")
  macroexpand((rx "[[" (eval page-name) "]]") nil)
  macroexp--expand-all((rx "[[" (eval page-name) "]]"))
  macroexp--all-forms((regexp (rx "[[" (eval page-name) "]]")) 1)
  macroexp--all-clauses(((regexp (rx "[[" (eval page-name) "]]"))) 1)
  #[1028 "\300\x01\300\301\x05\302\"\303\x06\a!\x06\b\242A#\x06\x06\242#\207" [macroexp--cons macroexp--all-clauses 1 macroexp--all-forms] 10 "\n\n(fn FORM BODY BINDINGS FUN)"](((let ((regexp (rx "[[" (eval page-name) "]]"))) regexp)) (regexp) ((regexp (rx "[[" (eval page-name) "]]"))) let)
  macroexp--expand-all((let ((regexp (rx "[[" (eval page-name) "]]"))) regexp))
  macroexp--all-forms(((let ((regexp (rx "[[" (eval page-name) "]]"))) regexp)))
  #[1028 "\300\x01\300\301\x05\302\"\303\x06\a!\x06\b\242A#\x06\x06\242#\207" [macroexp--cons macroexp--all-clauses 1 macroexp--all-forms] 10 "\n\n(fn FORM BODY BINDINGS FUN)"](((let ((page-name "the page")) (let ((regexp (rx "[[" (eval page-name) "]]"))) regexp))) ((let ((regexp (rx "[[" (eval page-name) "]]"))) regexp)) ((page-name "the page")) let)
  macroexp--expand-all((let ((page-name "the page")) (let ((regexp (rx "[[" (eval page-name) "]]"))) regexp)))
  macroexpand-all((let ((page-name "the page")) (let ((regexp (rx "[[" (eval page-name) "]]"))) regexp)))
  eval-sexp-add-defvars((let ((page-name "the page")) (let ((regexp (rx "[[" (eval page-name) "]]"))) regexp)))
  eval-defun-2()
  eval-defun(nil)
  call-interactively(eval-defun nil nil)
  command-execute(eval-defun)

But if you evaluate that buffer using M-x eval-buffer you get:

Eager macro-expansion failure: (void-variable page-name)

Regards,
-Brent





In GNU Emacs 24.5.1 (x86_64-pc-linux-gnu, GTK+ Version 3.18.9)
 of 2016-04-17 on lgw01-04, modified by Debian
Windowing system distributor `The X.Org Foundation', version 11.0.11803000
System Description:	Ubuntu 16.04 LTS

Configured using:
 `configure --build x86_64-linux-gnu --prefix=/usr
 --sharedstatedir=/var/lib --libexecdir=/usr/lib
 --localstatedir=/var/lib --infodir=/usr/share/info
 --mandir=/usr/share/man --with-pop=yes
 --enable-locallisppath=/etc/emacs24:/etc/emacs:/usr/local/share/emacs/24.5/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/24.5/site-lisp:/usr/share/emacs/site-lisp
 --build x86_64-linux-gnu --prefix=/usr --sharedstatedir=/var/lib
 --libexecdir=/usr/lib --localstatedir=/var/lib
 --infodir=/usr/share/info --mandir=/usr/share/man --with-pop=yes
 --enable-locallisppath=/etc/emacs24:/etc/emacs:/usr/local/share/emacs/24.5/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/24.5/site-lisp:/usr/share/emacs/site-lisp
 --with-x=yes --with-x-toolkit=gtk3 --with-toolkit-scroll-bars
 'CFLAGS=-g -O2 -fstack-protector-strong -Wformat
 -Werror=format-security -Wall' 'CPPFLAGS=-Wdate-time
 -D_FORTIFY_SOURCE=2' 'LDFLAGS=-Wl,-Bsymbolic-functions -Wl,-z,relro''

Important settings:
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
  diff-auto-refine-mode: t
  auto-insert-mode: t
  erc-services-mode: t
  erc-list-mode: t
  erc-menu-mode: t
  erc-ring-mode: t
  erc-networks-mode: t
  erc-pcomplete-mode: t
  erc-track-mode: t
  erc-match-mode: t
  erc-button-mode: t
  erc-fill-mode: t
  erc-stamp-mode: t
  erc-netsplit-mode: t
  erc-irccontrols-mode: t
  erc-noncommands-mode: t
  erc-move-to-prompt-mode: t
  erc-readonly-mode: t
  shell-dirtrack-mode: t
  delete-selection-mode: t
  iswitchb-mode: t
  display-time-mode: t
  tooltip-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: 1
  transient-mark-mode: t
  abbrev-mode: t

Recent messages:
Note: file is write protected
Fill column set to 80 (was 70)
File "/usr/share/emacs/24.5/lisp/emacs-lisp/pp.el.gz" is owned by root.
You can edit and save it which will automatically perform file permissions changes.
Quit [2 times]
Searched 1 buffer; 2152 matches for `...'
Renamed transient buffer "*Occur*" to "*Occur*<10>"
Searched 1 buffer; 2 matches for `\.\.\.'
Renamed transient buffer "*Occur*" to "*Occur*<11>"
Mark set [2 times]

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/home/brentg/emacs_lisp_imported/org-mode/org-mode/lisp/org-mhe hides /usr/share/emacs/24.5/lisp/org/org-mhe
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/home/brentg/emacs_lisp_imported/org-mode/org-mode/lisp/org-clock hides /usr/share/emacs/24.5/lisp/org/org-clock
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/home/brentg/emacs_lisp_imported/org-mode/org-mode/lisp/org-info hides /usr/share/emacs/24.5/lisp/org/org-info
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Features:
(etags shadow mailalias bbdb-vm vm-autoload bbdb-snarf mail-extr
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bug#23795: 24.5; rx eval on variable gives symbol error

[Noam Postavsky]

rx is a macro so it doesn't see runtime bindings, using
let-when-compile (new in Emacs 25) works:

(let-when-compile ((page-name "the page"))
  (rx "[[" (eval page-name) "]]"))

Not sure if the plain let case can/should be fixed.

bug#23795: 24.5; rx eval on variable gives symbol error

[Brent Goodrick]

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Ok thanks Noam. Then I conclude this isn't a bug per se.

On Sat, Jun 18, 2016 at 9:13 AM, Noam Postavsky <
npostavs@users.sourceforge.net> wrote:

> rx is a macro so it doesn't see runtime bindings, using
> let-when-compile (new in Emacs 25) works:
>
> (let-when-compile ((page-name "the page"))
>   (rx "[[" (eval page-name) "]]"))
>
> Not sure if the plain let case can/should be fixed.
>

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bug#23795: 24.5; rx eval on variable gives symbol error

[Andreas Schwab]

bgoodr@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@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

bug#23795: 24.5; rx eval on variable gives symbol error

[Brent Goodrick]

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Understood. Thanks Andreas.

On Sat, Jun 18, 2016 at 9:19 AM, Andreas Schwab <schwab@linux-m68k.org>
wrote:

> bgoodr@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@linux-m68k.org
> GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
> "And now for something completely different."
>

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