eintr: Understanding current-kill

 
 ‘current-kill’ in Outline
 -------------------------
 
 The ‘current-kill’ function looks complex, but as usual, it can be
 understood by taking it apart piece by piece.  First look at it in
 skeletal form:
 
      (defun current-kill (n &optional do-not-move)
        "Rotate the yanking point by N places, and then return that kill."
        (let VARLIST
          BODY...)
 
    This function takes two arguments, one of which is optional.  It has
 a documentation string.  It is _not_ interactive.
 

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