When installing org-mode: Symbol's value as variable is void: org-src-lang-modes

[elliottslaughter]

When I install a fresh copy of org-mode via a fresh el-get install, I see the following error:

Bug: Symbol's value as variable is void: org-src-lang-modes

Based on the backtrace below, this looks like it's going through el-get's loadefs magic. Is there any way that could be causing trouble?

Here is the backtrace:

Debugger entered--Lisp error: (void-variable org-src-lang-modes)
  add-to-list(org-src-lang-modes ("sclang" . sclang))
  byte-code("\300\301\302\303\304\"\"\207" [with-eval-after-load "org" add-to-list org-src-lang-modes ("sclang" . sclang)] 5)
  load("/home/eslaught/.emacs.d/el-get/.loaddefs" nil t)
  el-get-load-fast("/home/eslaught/.emacs.d/el-get/.loaddefs.el")
  el-get-eval-autoloads()
  el-get(sync)
  econf-install()
  eval-buffer(#<buffer  *load*-610652> nil "/home/eslaught/econf/econf-helper.el" nil t)  ; Reading at buffer position 1907
  load-with-code-conversion("/home/eslaught/econf/econf-helper.el" "/home/eslaught/econf/econf-helper.el" nil t)
  require(econf-helper)
  eval-buffer(#<buffer  *load*> nil "/home/eslaught/.emacs" nil t)  ; Reading at buffer position 205
  load-with-code-conversion("/home/eslaught/.emacs" "/home/eslaught/.emacs" t t)
  load("~/.emacs" t t)
  #[0 "^H\205\262^@     \306=\203^Q^@\307^H\310Q\202;^@ \311=\204^^^@\307^H\312Q\202;^@\313\307\314\315#\203*^@\316\202;^@\313\307\314\317#$
  command-line()
  normal-top-level()

Versions:

Emacs  : GNU Emacs 24.3.1 (x86_64-pc-linux-gnu, GTK+ Version 3.10.7)
 of 2014-03-07 on lamiak, modified by Debian
Package: Org mode installed via el-get, from the following Git commit

commit 489080124210a78d6622c79ede5c003e07c2ccb8
Merge: b900a85 731f59f
Author: Kyle Meyer <kyle@kyleam.com>
Date:   Mon Aug 14 22:04:35 2017 -0400

    Merge branch 'maint'

[npostavs]

I think this is a bug in org-mode, with-eval-after-load is new in Emacs 24.4.

The reason it's coming from el-get loaddefs is because of this block in contrib/lisp/ob-sclang.el (note the ;;;###autoload cookie):

;;;###autoload
(with-eval-after-load "org"
  (add-to-list 'org-src-lang-modes '("sclang" . sclang)))

[elliottslaughter]

I have confirmed that the same org-mode version loads correctly in Emacs 24.4.1 (and fails in 24.3.1), which supports the previous comment. I will report this to the upstream developers.

[kaushalmodi]

That's strange.. I would have thought that in that case with-eval-after-load should have thrown an error.

Update: Unless @elliottslaughter byte-compiled Org using 24.4 and trying to reuse the same on 24.3.

[elliottslaughter]

$ rm -rf ~/.emacs.d
$ /usr/bin/emacs --version
GNU Emacs 24.3.1
...
$ /usr/bin/emacs
...
Error (el-get): while installing org-mode: Symbol's value as variable is void: org-src-lang-modes

(My .emacs is set to load el-get and install org-mode.)

Is there any other way I could be getting stale build results?

[kaushalmodi]

I just pushed this to Org maint branch (and merged to master too): http://orgmode.org/cgit.cgi/org-mode.git/commit/?h=maint&id=7a29c82e1100f0e0e5c1c8d8b276139358abb031

See if that fixes this issue.

[elliottslaughter]

The fix works, thanks.

[npostavs]

That's strange.. I would have thought that in that case with-eval-after-load should have thrown an error.

Update: Unless @elliottslaughter byte-compiled Org using 24.4 and trying to reuse the same on 24.3.

When compiling on 24.3, Emacs doesn't know about with-eval-after-load so it's treated as a function, therefore the argument expressions get evaluated first, e.g.,

(progn
  (defun foo ()
    (outer (inner)))
  (byte-compile 'foo)
  (foo))

gives (void-function inner).