fix tests

Author: hauntsaninja

mypy/stubtest.py

@@ -1497,14 +1497,16 @@ def build_stubs(modules: list[str], options: Options, find_submodules: bool = Fa
             # find submodules via pkgutil
             try:
                 runtime = silent_import_module(module)
+                runtime_path = runtime.__path__
+                runtime_name = runtime.__name__
             except KeyboardInterrupt:
                 raise
             except BaseException:
                 pass
             else:
                 all_modules.extend(
                     m.name
-                    for m in pkgutil.walk_packages(runtime.__path__, runtime.__name__ + ".")
+                    for m in pkgutil.walk_packages(runtime_path, runtime_name + ".")
                     if m.name not in all_modules
                 )