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-rw-r--r--sphinx/ext/inheritance_diagram.py2
1 files changed, 2 insertions, 0 deletions
diff --git a/sphinx/ext/inheritance_diagram.py b/sphinx/ext/inheritance_diagram.py
index 38fc9255a..f848ac037 100644
--- a/sphinx/ext/inheritance_diagram.py
+++ b/sphinx/ext/inheritance_diagram.py
@@ -28,6 +28,8 @@ The graph is inserted as a PNG+image map into HTML and a PDF in
LaTeX.
"""
+from __future__ import annotations
+
import builtins
import inspect
import re