diff options
Diffstat (limited to 'lisp/emacs-lisp')
| -rw-r--r-- | lisp/emacs-lisp/rx.el | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/lisp/emacs-lisp/rx.el b/lisp/emacs-lisp/rx.el index 8ef78fd69e6..2130e3e1aea 100644 --- a/lisp/emacs-lisp/rx.el +++ b/lisp/emacs-lisp/rx.el @@ -725,6 +725,8 @@ FORM is either `(repeat N FORM1)' or `(repeat N M FORMS...)'." (defun rx-submatch-n (form) "Parse and produce code from FORM, which is `(submatch-n N ...)'." (let ((n (nth 1 form))) + (unless (and (integerp n) (> n 0)) + (error "rx `submatch-n' argument must be positive")) (concat "\\(?" (number-to-string n) ":" (if (= 3 (length form)) ;; Only one sub-form. |