From: Tomasz Buchert <tomasz@debian.org>
Date: Sun, 16 Aug 2020 12:56:51 +0200
Subject: Workaround for #963648.

---
 doc/_exts/rubydomain/rubydomain.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/doc/_exts/rubydomain/rubydomain.py b/doc/_exts/rubydomain/rubydomain.py
index db35233..105467b 100644
--- a/doc/_exts/rubydomain/rubydomain.py
+++ b/doc/_exts/rubydomain/rubydomain.py
@@ -24,6 +24,9 @@ from sphinx.directives import ObjectDescription
 from sphinx.util.nodes import make_refnode
 from sphinx.util.docfields import Field, GroupedField, TypedField
 
+# NOTE(#963648): Fix for sphinx >= 3.
+l_ = _
+
 # REs for Ruby signatures
 rb_sig_re = re.compile(
     r'''^ ([\w.]*\.)?            # class name(s)