diff options
Diffstat (limited to 'lisp/font-lock.el')
| -rw-r--r-- | lisp/font-lock.el | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/lisp/font-lock.el b/lisp/font-lock.el index de366997a93..7819a0e81cc 100644 --- a/lisp/font-lock.el +++ b/lisp/font-lock.el @@ -1507,6 +1507,13 @@ Here each COMPILED is of the form (MATCHER HIGHLIGHT ...) as shown in the `font-lock-keywords' doc string. If REGEXP is non-nil, it means these keywords are used for `font-lock-keywords' rather than for `font-lock-syntactic-keywords'." + (if (not font-lock-set-defaults) + ;; This should never happen. But some external packages sometimes + ;; call font-lock in unexpected and incorrect ways. It's important to + ;; stop processing at this point, otherwise we may end up changing the + ;; global value of font-lock-keywords and break highlighting in many + ;; other buffers. + (error "Font-lock trying to use keywords before setting them up")) (if (eq (car-safe keywords) t) keywords (setq keywords |