#' Check weather a lazy stream is lempty
#'
#' @name lnull
#' @param x a lazy stream object
#' @details 'lempty' is just a symbol representing empty list of a lazy stream object.
#' lnull() tests whether a R object equals lempty.
#' @examples
#' lnull(llist(1, 2, 3)) # => FALSE
#' lnull(lempty) # => TRUE
NULL
#' @rdname lnull
#' @export
lnull <- function(x) identical(x, lempty)
#' @rdname lnull
#' @export
lempty <- quote(empty)
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