Fix #8652: autodoc: variable comments are ignored if invalid type comments found

To avoid the crash of ModuleAnalyzer from invalid type comments, this
start to retry parsing without type_comments=False when `ast.parse()`
raises SyntaxError.

1 files changed, 4 insertions, 0 deletions

diff --git a/sphinx/pycode/ast.py b/sphinx/pycode/ast.py
index d131ff4c1..65534f958 100644
--- a/sphinx/pycode/ast.py
+++ b/sphinx/pycode/ast.py
@@ -52,6 +52,10 @@ def parse(code: str, mode: str = 'exec') -> "ast.AST":
     try:
         # type_comments parameter is available on py38+
         return ast.parse(code, mode=mode, type_comments=True)  # type: ignore
+    except SyntaxError:
+        # Some syntax error found. To ignore invalid type comments, retry parsing without
+        # type_comments parameter (refs: https://github.com/sphinx-doc/sphinx/issues/8652).
+        return ast.parse(code, mode=mode)
     except TypeError:
         # fallback to ast module.
         # typed_ast is used to parse type_comments if installed.