Function sc_light::new_fetch_checker

pub fn new_fetch_checker<E, B: BlockT, S: BlockchainStorage<B>>(
    blockchain: Arc<Blockchain<S>>, 
    executor: E, 
    spawn_handle: Box<dyn SpawnNamed>
) -> LightDataChecker<E, HashFor<B>, B, S> where
    E: CodeExecutor, 

Create an instance of fetch data checker.