From 987ca793b63980bc9b728e6c66c71b42ad77bd7b Mon Sep 17 00:00:00 2001
From: Dimitri Papadopoulos
 <3234522+DimitriPapadopoulos@users.noreply.github.com>
Date: Tue, 2 Jan 2024 10:06:44 +0100
Subject: [PATCH] Apply refurb/ruff rule FURB142

[FURB142]: Replace `for x in y: s.add(docname)` with `s.update(y)`
---
 sphinx/builders/__init__.py | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/sphinx/builders/__init__.py b/sphinx/builders/__init__.py
index 9bcc8c7b1eb..ae23556546f 100644
--- a/sphinx/builders/__init__.py
+++ b/sphinx/builders/__init__.py
@@ -314,8 +314,7 @@ def build(
 
         doccount = len(updated_docnames)
         logger.info(bold(__('looking for now-outdated files... ')), nonl=True)
-        for docname in self.env.check_dependents(self.app, updated_docnames):
-            updated_docnames.add(docname)
+        updated_docnames.update(self.env.check_dependents(self.app, updated_docnames))
         outdated = len(updated_docnames) - doccount
         if outdated:
             logger.info(__('%d found'), outdated)