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-rw-r--r--sphinx/io.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/sphinx/io.py b/sphinx/io.py
index 0f21298ac..f3e72733e 100644
--- a/sphinx/io.py
+++ b/sphinx/io.py
@@ -8,6 +8,7 @@
:license: BSD, see LICENSE for details.
"""
import codecs
+import warnings
from typing import Any
from docutils.core import Publisher