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From: "Richard M. Stallman" <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Bugs in newly added completion capabilities.
Date: Fri, 01 Jul 2005 18:45:19 -0400
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    > I think it's only ambiguous if you used symbols in a _mixed_ list --
    > one with both plain symbols and cons-cells with a symbol as their car.
    >  If the elements of the list are consistently one or the other, the
    > pattern (lambda (arg ...) ...) can never occur.

    And the lambda always has 3 args in this context, so (lambda nil ...)
    will never occur.

Ok, would people like to implement this?