On Sep 18, 2014, at 9:17 AM, Richard Stallman <rms@gnu.org> wrote:

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provide sane names when necessary (like setcar is provided for rplaca)


setcar is not entirely equivalent to rplaca -- they return different
values.  That's why I gave it a different name.


That appears to no longer be true (emacs-24 branch):

rplaca is an alias for `setcar' in `subr.el'.

(rplaca CELL NEWCAR)

Set the car of CELL to be NEWCAR.  Returns NEWCAR.

-Ivan