Fix missing __dict__

Author: sbrunner

astroid/raw_building.py

@@ -369,7 +369,11 @@ def _base_class_object_build(
         # this at least resolves common case such as Exception.args,
         # OSError.errno
         if issubclass(member, Exception):
-            instdict = member().__dict__
+            member_object = member()
+            if hasattr(member_object, "__dict__"):
+                instdict = member_object.__dict__
+            else:
+                raise TypeError
         else:
             raise TypeError
     except TypeError:

tests/test_raw_building.py

@@ -32,6 +32,7 @@
     build_from_import,
     build_function,
     build_module,
+    object_build_class,
 )
 
 DUMMY_MOD = build_module("DUMMY")
@@ -160,3 +161,12 @@ def mocked_sys_modules_getitem(name: str) -> types.ModuleType | CustomGetattr:
     assert expected_err in caplog.text
     assert not out
     assert not err
+
+
+def test_missing__dict__():
+    # This shouldn't raise an exception.
+    class TestError(Exception):
+        def __init__(self):
+            del self.__dict__
+
+    object_build_class(build_module(_io.__name__), TestError)