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[no subject]

How about next lisp having a new subr DISPLACE, roughly defined as
(defun displace (x y) (rplaca x (car y)) (rplacd x (cdr y)) x)
and how about new fsubrs corresponding to the definitions for
PUSH, POP, and LET as found in the compiler under the functions
PUSHMENT, POPMENT, and LETMENT.  I would hope to get some argument
destruction (i.e., "pattern matching") for the variables to be "letted".