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Backquote idioms

    Date: Fri, 17 May 85 20:44:49 EST
    From: Jonathan A Rees <JAR@MIT-MC@think>
    Subject:  Backquote idioms
    To: gls%AQUINAS@THINK

    And consider the useful but not CL-supported ,,@ .

Much to my surprise, I find that
(a)  ,,@  *is* supported by Common Lisp.
(b)  ,,@  is equivalent to  ,@(list ,@

I obtained these results by working through the expansions of
	`(foo `(bar ,,@x))
and     `(foo `(bar ,@(list ,@x)))
using the rules on pages 349-350 of the CLM.
--Guy