Re: comma-dot ?

[Kevin Rodgers]

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>