[m-rev.] for review: fix bug with impure lambda expressions

[Zoltan Somogyi]

On 11-Aug-2005, Julien Fischer <juliensf at cs.mu.OZ.AU> wrote:
> I don't think the predicates in arg_info.m are all that related; in
> particular most of the code there is used in later stages of
> compilation.  It doesn't seem to need to deal with the possibility of
> undefined modes.  Unless you feel strongly that this test belongs in
> arg_info.m, I'm going to leave it here.

Fine, but please put a comment at the top of arg_info.m pointing readers
to this predicate and how it differs from the ones in arg_info.m.

Zoltan.
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