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bug#13814: 24.3.50; Dynamic variables shadowing prevent defvar
From: |
Jorgen Schaefer |
Subject: |
bug#13814: 24.3.50; Dynamic variables shadowing prevent defvar |
Date: |
Mon, 25 Feb 2013 20:30:29 +0100 |
When a file is autoloaded, defvar will fail to define locally-set,
dynamic variabls, resulting in such variables not being defined at all,
even after their local binding ends.
Situation:
(let ((some-var-that-influences-behavior t))
(some-function-that-autoloads-a-library))
If the library which is autoloaded by
`some-function-that-autoloads-a-library' defines
`some-var-that-influences-behavior' using defvar or defcustom, the
variable is never bound globally because defvar thinks it's already
defined.
I would expect defvar to notice that the variable is bound only
locally/temporarily and define a global binding anyhow.
Reproduction:
Put this file, bug-lib.el, somewhere in `load-path':
-----8<----- bug-lib.el -----8<-----
(defvar bug-variable t
"This variable is not defined when autoloaded.")
(defun bug-variable-value ()
bug-variable)
----->8----- ---------- ----->8-----
Then execute the following lines:
(autoload 'bug-variable-value "bug-lib.el")
(let ((bug-variable nil))
(bug-variable-value))
=> nil
(bug-variable-value)
=> Error, `bug-variable' is not defined.
Regards,
-- Jorgen
In GNU Emacs 24.3.50.1 (x86_64-unknown-linux-gnu)
Bzr revision: 111608 schwab@linux-m68k.org-20130126151309-wk3nb8t4xitw94lh
Configured using:
`configure --without-x --with-x-toolkit=no'
- bug#13814: 24.3.50; Dynamic variables shadowing prevent defvar,
Jorgen Schaefer <=