@CheckReturnValue
    @NonNull
    @SchedulerSupport(SchedulerSupport.NONE)
    public static <T> Maybe<T> fromSingle(SingleSource<T> singleSource) {
        ObjectHelper.requireNonNull(singleSource, "singleSource is null");
        return RxJavaPlugins.onAssembly(new MaybeFromSingle<T>(singleSource));
    }