block8.

import { 
  call, 
  put, 
  cancelled,
} from 'redux-saga/effects';
import { 
  REQUEST_BUTTER_ERROR, 
} from './constants';
import { api } from './someApi';

function* fetchCarStatus(requestCancelToken = cancelToken()) {
  try {
    const response = yield call(apiCall, {
      cancelToken: requestCancelToken.token,
    });
    put(someAction(someMapping(response)));
  } catch (error) {
    put({ type: REQUEST_BUTTER_ERROR, payload: error });
  } finally {
    if (yield cancelled()) {  
	   requestCancelToken.cancel();
    }
  }
}