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-rw-r--r--sphinx/pycode/ast.py2
1 files changed, 2 insertions, 0 deletions
diff --git a/sphinx/pycode/ast.py b/sphinx/pycode/ast.py
index 155ae86d5..22207b715 100644
--- a/sphinx/pycode/ast.py
+++ b/sphinx/pycode/ast.py
@@ -38,6 +38,8 @@ def unparse(node: ast.AST) -> str:
"""Unparse an AST to string."""
if node is None:
return None
+ elif isinstance(node, str):
+ return node
elif isinstance(node, ast.Attribute):
return "%s.%s" % (unparse(node.value), node.attr)
elif isinstance(node, ast.Bytes):