@CheckReturnValue
    @NonNull
    @SchedulerSupport(SchedulerSupport.NONE)
    public static <T> Single<T> fromCallable(final Callable<? extends T> callable) {
        ObjectHelper.requireNonNull(callable, "callable is null");
        return RxJavaPlugins.onAssembly(new SingleFromCallable<T>(callable));
    }