Subject: 28.0.50; re-builder immediately signals error when switching to rx syntax

From: Stefan Kangas <[email-masked]>
Date: Sat, 25 Sep 2021 20:07:48 -0700

Severity: minor

I get this error in re-builder:

    "rx--translate-symbol: Unknown rx symbol ‘nil’"

Steps to reproduce:

0. emacs -Q
1. M-x re-builder RET
2. C-c TAB rx RET

The same thing happens if I pick "sregex" instead of "rx".