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Re: Questions about specification and possible implementations

I consider Skef Wholey to be incorrect when he says that "it is
an error" to redefine BUILT-IN keyword functions.  In the
published Common LISP manual on page 90 under the heading
"symbol-function" I see:

  The global function definitiion of a symbol may be altered by
  using setf with symbol-function.  . . .  It is an error to
  attempt to redefine the name of a special form (see Table 5-1).

Does anyone else know differently from this?