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-rw-r--r--sphinx/versioning.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/sphinx/versioning.py b/sphinx/versioning.py
index 74355efe..d45ed1d3 100644
--- a/sphinx/versioning.py
+++ b/sphinx/versioning.py
@@ -12,7 +12,7 @@
from uuid import uuid4
from operator import itemgetter
-from sphinx.util.pycompat import product, zip_longest
+from sphinx.util.pycompat import product, zip_longest, all
# anything below that ratio is considered equal/changed