ok.
i hereby withdraw my change, and the associated news file entry:
** The variable `kill-whole-line' now only takes effect interactively.
(This variable controls the behavior of `kill-line'.) Although this
is a departure from a previous behavior in the case of setting this
variable `kill-whole-line' to t, it is almost certainly what has
always been intended, and most likely the old way of doing things
introduced bugs.
after my previous kill-line change was withdrawn, there's no point to this one
either.
Hrvoje Niksic wrote:
 
 Ben, I believe one of your changes to kill-line broke its execution in
 macros.
 
 For some time now I've been witnessing a strange discrepancy in the
 behavior of keyboard macros during recording and execution.  Finally
 I've narrowed it down to `kill-line' misbehaving.  The problem is that
 the variable `kill-whole-line' is not respected when `kill-line' is
 executed as part of a keyboard macro.
 
 TO REPEAT:
 
 Start `xemacs -vanilla', set `kill-whole-line' to t.  See that
 kill-line at BOL kills the entire line.  Now record a macro solely
 consisting of C-k:
 
     C-x ( C-k C-x )
 
 Try executing it with `C-x e' and you'll see that it no longer kills
 the whole line, but only the part up to the newline, as if
 kill-whole-line were set to nil.
 
 I haven't had the time to investigate this properly, but I suspect the
 problem is in this change:
 
     If called interactively, may kill the entire line when given no
     ^^^^^^^^^^^^^^^^^^^^^^^
     argument at the beginning of a line; see `kill-whole-line'.
 
 Apparently functions bound to keys executed in keyboard macros get
 call non-interactively[1].  In the case of kill-line, it makes a big
 difference, thus causing the macro weirdness.
 
 I'm working around the problem by redefining kill-line in my .emacs,
 but a real fix would be to make macro execution execute commands with
 `call-interactively', as God intended.  (But this may cause other side
 effects.)
 
 [1]
 This is easy to test by creating a dummy command that prints a message
 if (interactive-p) and binding it to a key.  And indeed, I confirmed
 that such a command prints its message on a key press, but not when
 invoked as part of macro execution! 
-- 
ben
I'm sometimes slow in getting around to reading my mail, so if you
want to reach me faster, call 520-661-6661.
See 
http://www.666.com/ben/chronic-pain/ for the hell I've been
through.