Fix missing __dict__ (#2685)

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:

requirements_dev.txt

@@ -4,5 +4,4 @@
 black
 pre-commit
 pylint>=3.2.7
-mypy
 ruff

requirements_minimal.txt

@@ -6,3 +6,4 @@ tbump~=6.11
 coverage~=7.6
 pytest
 pytest-cov~=6.0
+mypy

tests/test_raw_building.py

@@ -19,6 +19,7 @@
 from typing import Any
 from unittest import mock
 
+import mypy.build
 import pytest
 
 import tests.testdata.python3.data.fake_module_with_broken_getattr as fm_getattr
@@ -33,6 +34,7 @@
     build_from_import,
     build_function,
     build_module,
+    object_build_class,
 )
 
 DUMMY_MOD = build_module("DUMMY")
@@ -169,3 +171,8 @@ 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.
+    object_build_class(DUMMY_MOD, mypy.build.ModuleNotFound)