message: Fix the ast.Module call for py3.8
diff: @@ -178,7 +178,7 @@ def run_user_main(wrapped_test_module):
  wrapped_test_module.__name__)
  # expr is defined because we would have raised an error otherwise.
  - new_ast = ast.Module(body=expr.body) # pylint:disable=undefined-loop-variable
  + new_ast = ast.Module(body=expr.body, type_ignores=[]) # pylint:disable=undefined-loop-variable
  exec( # pylint:disable=exec-used
  compile(new_ast, '<ast>', 'exec'),
  globals(),
  