autodoc: Fix UnboundLocalError in filter_members (#11651)

Author: AA-Turner

sphinx/ext/autodoc/__init__.py

@@ -678,9 +678,23 @@ def is_filtered_inherited_member(name: str, obj: Any) -> bool:
             try:
                 membername = obj.__name__
                 member = obj.object
-                # if isattr is True, the member is documented as an attribute
-                isattr = member is INSTANCEATTR or (namespace, membername) in attr_docs
+            except AttributeError:
+                if isinstance(obj, ObjectMember):
+                    raise
+                # To be removed, retained for compatibility.
+                # See https://github.com/sphinx-doc/sphinx/issues/11631
+                membername, member = obj
+                warnings.warn(
+                    'Returning tuples of (name, object) as '
+                    'the second return value from get_object_members() is deprecated. '
+                    'Return ObjectMember(name, object) instances instead.',
+                    RemovedInSphinx80Warning, stacklevel=2,
+                )
+
+            # if isattr is True, the member is documented as an attribute
+            isattr = member is INSTANCEATTR or (namespace, membername) in attr_docs
 
+            try:
                 doc = getdoc(member, self.get_attr, self.config.autodoc_inherit_docstrings,
                              self.object, membername)
                 if not isinstance(doc, str):