typedef struct TaskManager<Impl>{
    __code spawn(Impl* taskManager, struct Context* task, __code next(...));
    __code spawnTasks(Impl* taskManagerImpl, struct Element* taskList, __code next1(...));
    __code setWaitTask(Impl* taskManagerImpl, struct Context* task, __code next(...));
    __code shutdown(Impl* taskManagerImpl, __code next(...));
    __code incrementTaskCount(Impl* taskManagerImpl, __code next(...));
    __code decrementTaskCount(Impl* taskManagerImpl, __code next(...));
    __code next(...);
    __code next1(...);
} TaskManager;