Usage examples:

  arc> help.acons
  [fn]  (acons x)
   Determines if `x' is a `cons' cell or list.
      Unlike 'alist, this function will return nil if given an empty list
      See also [[atom]] [[alist]] [[dotted]] [[isa]] [[cons]] [[list]] 
  nil
  arc> help.alist
  [fn]  (alist x)
   Return true if argument is a possibly empty list
      Unlike 'acons, this function returns t when given an empty list
      See also [[atom]] [[acons]] [[dotted]] [[isa]] [[cons]] [[list]] 
  nil
  arc> help.afn
  [mac] (afn parms . body)
   Creates a function which calls itself with the name `self'.
      See also [[fn]] [[rfn]] [[aif]] [[awhen]] [[aand]] 
  nil

It needs a big GET ARC button at the bottom though. Linking either to the canonical install page on arclanguage.org or the community anarki git repo. The decision is yours as to which one, no pressure ;)

[ The site is an amazing piece of advertising, but it's not closing the sale :/ ]