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bug#4395: 23.1; byte-compiler loses top-level (put 'x...)

From: Drew Adams
Subject: bug#4395: 23.1; byte-compiler loses top-level (put 'x...)
Date: Thu, 10 Sep 2009 17:04:59 -0700

emacs -Q
Put these sexps somewhere at the top level of a file foo.el:
(require 'bar)
(put 'thevar 'variable-documentation "The new doc string")
(provide 'foo)
Put these sexps in file bar.el:
(defvar thevar 42 "Original doc string.")
(provide 'bar)
Byte-compile the files.
emacs -Q
Load library foo.
C-h v the-var
The doc shown is the original doc string. The top-level `put' had no
Doing the same thing using the *.el instead of *.elc works - no
It also works, with the byte-compiled files, if you wrap the `put'
sexp in `when':
(when t (put 'foovar 'variable-documentation "The new doc string"))
(Actually, I tried with (require 'XXX) instead of t.)

2. It also works with the byte-compiled files, if you add a vacuous
defvar to foo.el:
(defvar thevar)
(put 'thevar 'variable-documentation "The new doc string")
That is the approach used in library cc-vars.el. If this is a
recommended cliche, or is the only good way to change the doc string
of a var, then it needs to be documented in the Elisp manual.

3. Feature request: Have something similar to defadvice for a
variable, at least to be able to add to its doc string.

In GNU Emacs 23.1.1 (i386-mingw-nt5.1.2600)
 of 2009-07-29 on SOFT-MJASON
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (4.4)'

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