bug#34373: Acknowledgement (26.1; Missing range check in rx-submatch-n)

[Lars Ingebrigtsen]

Mattias Engdegård <mattiase@acm.org> writes:

> * lisp/emacs-lisp/rx.el (rx-submatch): Type and range check (Bug#34373).

[...]

>  (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"))

This looks like an eminently reasonable sanity check to me, but I'm
quite unfamiliar with the rx machinery.  Just push the change?

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