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-rw-r--r--sphinx/util/cfamily.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/sphinx/util/cfamily.py b/sphinx/util/cfamily.py
index 09bd68b63..4d79179d5 100644
--- a/sphinx/util/cfamily.py
+++ b/sphinx/util/cfamily.py
@@ -458,5 +458,5 @@ class BaseParser:
res.append(attr)
return ASTAttributeList(res)
- def _parse_paren_expression_list(self) -> ASTBaseParenExprList:
+ def _parse_paren_expression_list(self) -> ASTBaseParenExprList | None:
raise NotImplementedError