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Re: comma-dot ?

From: Kevin Rodgers
Subject: Re: comma-dot ?
Date: Thu, 29 May 2003 14:49:46 -0600
User-agent: Mozilla/5.0 (X11; U; SunOS i86pc; en-US; rv: Gecko/20020406 Netscape6/6.2.2

Stefan Monnier wrote:

While looking at the lread.c code recently I bumped into
the comma-dot read syntax:  the reader not only recognizes
, and ,@ but also ,. as a special thingy.

Does anybody know what this is/was for ?

Probably compatibility with Common Lisp:

        Anywhere ",@" may be used, ",." may be used instead to indicate
        that it is permissible to destroy the list produced by the form
        following the ",."; this may permit more efficient code, using
        nconc instead of append, for example.

<a href="mailto:&lt;kevin.rodgers&#64;ihs.com&gt;";>Kevin Rodgers</a>

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