Whence the future package?

What is the status of the "future" package? I have a function I'd like to put in there to simplify an Emacs synch I'm working on. ;; XEmacs < 2.5.16 supports only 2 parameters to pos-visible-in-window-p. ;; Ignoring the third argument (PARTIALLY) is safe, in the sense that it may ;; make the display slightly less pretty than it would be if the argument were ;; supported, but nothing will crash or return incorrect results. (when (eq (function-max-args #'pos-visible-in-window-p) 2) (defconst internal-pos-visible-in-window-p (symbol-function 'pos-visible-in-window-p) "The builtin function originally named `pos-visible-in-window-p'.") (fset 'pos-visible-in-window-p #'(lambda (&optional pos window partially) "Returns t if position POS is currently on the frame in WINDOW. Returns nil if that position is scrolled vertically out of view. If a character is only partially visible, nil is returned, unless the optional argument PARTIALLY is non-nil. POS defaults to point in WINDOW's buffer; WINDOW, to the selected window." (funcall internal-pos-visible-in-window-p pos window)))) Should I use defadvice instead? (FWIW, I first used lexical-let instead of the defconst above, but that mangled the docstring of pos-visible-in-window-p. This is essentially what lexical-let expands to, anyway.) -- Jerry James http://www.ittc.ku.edu/~james/