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-rw-r--r--sphinx/environment/collectors/indexentries.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/sphinx/environment/collectors/indexentries.py b/sphinx/environment/collectors/indexentries.py
index c9aeda7e1..596c98c09 100644
--- a/sphinx/environment/collectors/indexentries.py
+++ b/sphinx/environment/collectors/indexentries.py
@@ -15,6 +15,7 @@ from sphinx.environment.collectors import EnvironmentCollector
if False:
# For type annotation
+ from typing import Set # NOQA
from docutils import nodes # NOQA
from sphinx.applicatin import Sphinx # NOQA
from sphinx.environment import BuildEnvironment # NOQA