On Wed, Sep 2, 2009 at 2:39 PM, Stavros Macrakis<macra...@alum.mit.edu> wrote:
> Most types of language objects are regarded as recursive: those
> which are not are the atomic vector types, 'NULL' and symbols (as
> given by 'as.name').
>
> But is.recursive(as.name('foo')) == is.recursive(quote(foo)) == FALSE.
Sorry, this *is* consistent with the behavior. But if we read "the
atomic vector types, 'NULL' and symbols" as a list of mutually
exclusive categories, then is.atomic(NULL)==FALSE is inconsistent.
-s
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