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Optimization of slot access in default argument expressions

    Date: Tue, 8 Jan 91 10:51 CST
    From: lgm@iexist.att.com

    Is this difference somehow required by the ANSI Common Lisp spec, or is
    this simply a minor case that Symbolics has not yet gotten around to

&AUX variables aren't even "arguments"; they're simply a shorthand for
binding local variables.  I think this is simply a missing optimization.

(defun/defmethod foo (... &aux <aux-specs>) [<doc-string>] <body>)

is defined to be equivalent to

(defun foo (...)
  (let* <aux-specs>

as long as <body> doesn't begin with any declarations (if it does, then
the declarations related to the real arguments have to be outside the
LET*, while those for the &AUX variables must be inside).