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-rw-r--r--sphinx/versioning.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/sphinx/versioning.py b/sphinx/versioning.py
index 1a9c1ced..9ba7e3f7 100644
--- a/sphinx/versioning.py
+++ b/sphinx/versioning.py
@@ -87,7 +87,8 @@ def merge_doctrees(old, new, condition):
else:
old_nodes.append(old_node)
new_nodes.append(new_node)
- for (i, new_node), (j, old_node) in product(enumerate(new_nodes), enumerate(old_nodes)):
+ for (i, new_node), (j, old_node) in product(enumerate(new_nodes),
+ enumerate(old_nodes)):
if merge_node(old_node, new_node):
del new_nodes[i]
del old_nodes[j]