var ( registerationRewardFunc = delay.Func("registration-rewards", registrationReward))
func registrationRewardHandler(w http.ResponseWriter, r *http.Request) { c := appengine.NewContext(r) err := registerationRewardFunc.Call(c) checkErr(err)}
func registrationReward(c context.Context) error { // I use `c` from now on
....
....
}