Fix ;;;###autoload scanning from (some) packages

* lisp/emacs-lisp/loaddefs-gen.el (loaddefs-generate--parse-file):
Fix autoloads scanning from packages.

Author: larsmagne

lisp/emacs-lisp/loaddefs-gen.el

@@ -366,7 +366,11 @@ don't include."
 
       ;; We always return the package version (even for pre-dumped
       ;; files).
-      (when package-data
+      (if (not package-data)
+          ;; We have to switch `emacs-lisp-mode' when scanning
+          ;; loaddefs for packages so that `syntax-ppss' later gives
+          ;; correct results.
+          (emacs-lisp-mode)
         (let ((version (lm-header "version"))
               package)
           (when (and version