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-rw-r--r--lisp/emacs-lisp/autoload.el4
1 files changed, 4 insertions, 0 deletions
diff --git a/lisp/emacs-lisp/autoload.el b/lisp/emacs-lisp/autoload.el
index 9ae7188120a..1a85cd7c688 100644
--- a/lisp/emacs-lisp/autoload.el
+++ b/lisp/emacs-lisp/autoload.el
@@ -314,6 +314,10 @@ are used."
(expand-file-name generated-autoload-file
(expand-file-name "lisp"
source-directory)))))
+ (or (> (buffer-size) 0)
+ (error "Autoloads file %s does not exist" buffer-file-name))
+ (or (file-writable-p buffer-file-name)
+ (error "Autoloads file %s is not writable" buffer-file-name))
(save-excursion
(save-restriction
(widen)