Re: master 13fe8a2: Fix rare undefined behaviors in replace-match

[Stefan Monnier]

>> +    xsignal2 (Qerror,
>> +              build_string ("replace-match subexpression does not exist"),
>> +              subexp);
>
> This is probably a better error to signal here for this error, but it
> possibly changes the behaviour.  If somebody previously had
> condition-case'd this for args-out-of-range, then they'll get a new
> error signalled now (which is why I kept that signal)...

One way out is to `define-error` a new error for that, which has
`args-out-of-range` as a parent.


        Stefan