def _set_singleton_data(cls, the_one: DebugOutputFile, interim: bool) -> None:
        """Set the one DebugOutputFile to rule them all."""
        singleton_module = types.ModuleType(cls.SYS_MOD_NAME)
        setattr(singleton_module, cls.SINGLETON_ATTR, (the_one, interim))
        sys.modules[cls.SYS_MOD_NAME] = singleton_module
Set the one DebugOutputFile to rule them all.
coverage/debug.py