On Sep 18, 2014, at 9:17 AM, Richard Stallman <address@hidden
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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.