Merge pull request #8274 from tk0miya/8200_typealias_break_type_annot…

…ation

Fix #8200: autodoc: type aliases break type formatting

CHANGES

@@ -41,6 +41,7 @@ Bugs fixed
   typing.Generic
 * #8157: autodoc: TypeError is raised when annotation has invalid __args__
 * #7964: autodoc: Tuple in default value is wrongly rendered
+* #8200: autodoc: type aliases break type formatting of autoattribute
 * #8192: napoleon: description is disappeared when it contains inline literals
 * #8142: napoleon: Potential of regex denial of service in google style docs
 * #8169: LaTeX: pxjahyper loaded even when latex_engine is not platex

sphinx/ext/autodoc/__init__.py

@@ -1736,7 +1736,8 @@ def can_document_member(cls, member: Any, membername: str, isattr: bool, parent:
         return inspect.isgenericalias(member)
 
     def add_directive_header(self, sig: str) -> None:
-        self.options.annotation = SUPPRESS  # type: ignore
+        self.options = Options(self.options)
+        self.options['annotation'] = SUPPRESS
         super().add_directive_header(sig)
 
     def add_content(self, more_content: Any, no_docstring: bool = False) -> None:
@@ -1760,7 +1761,8 @@ def can_document_member(cls, member: Any, membername: str, isattr: bool, parent:
         return isinstance(member, TypeVar) and isattr  # type: ignore
 
     def add_directive_header(self, sig: str) -> None:
-        self.options.annotation = SUPPRESS  # type: ignore
+        self.options = Options(self.options)
+        self.options['annotation'] = SUPPRESS
         super().add_directive_header(sig)
 
     def get_doc(self, encoding: str = None, ignore: int = None) -> List[List[str]]: