tags 40409 + patch
quit

Serghei Iakovlev <egrep@protonmail.ch> writes:

> Hello,
>
> This is reproducible using 'emacs -Q':
>
> - Open Emacs
> - M-x re-builder RED
> - Take a look at *Messages* buffer:
>
>   Error running timer ‘jit-lock--debug-fontify’: (void-variable n-reb)

The code causing this was added by [1: c1234ca9c3] (from Bug#6347), so
it's a regression since 26.3.

The problem seems to be that the initial binding of n-reb is missing,
and also that the code assumes dynamic binding (using symbol-value and
set on n-reb).  I would suggest the following patch: