bug#7500: 24.0.50; doc string of `current-kill'

[Lars Magne Ingebrigtsen <larsi@gnus.org>]

"Drew Adams" <drew.adams@oracle.com> writes:

> And since the return value of i-p-a is _supposed_ to be either nil or a
> string-or-list-of-strings:
>
>  When N is zero, call the value of `interprogram-paste-function'.
>  If that call returns nil, do nothing more and return the
>  kill-ring car (??).  Otherwise, prepend the returned string
>  (or list of strings) to the kill ring and then return the new
>  kill-ring car.
>
> See "??" above.  What does `current-kill' return if `i-p-f' returns nil when
> called? the existing kill-ring head? nil?

Looking at the code, if it returns nil, then the entire "When" statement
fails.  I'll try to work that in...  somehow...

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