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-rw-r--r--sphinx/util/pycompat.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/sphinx/util/pycompat.py b/sphinx/util/pycompat.py
index a33a832c8..a3521b01e 100644
--- a/sphinx/util/pycompat.py
+++ b/sphinx/util/pycompat.py
@@ -27,7 +27,7 @@ NoneType = type(None)
# Python 2/3 compatibility
# prefix for Unicode strings
-u = ''
+u = '' # RemovedInSphinx40Warning
# sys_encoding: some kind of default system encoding; should be used with