[m-rev.] for review: start integrating stream typeclasses into stdlib

[Julien Fischer]

On Fri, 27 Oct 2006, Ian MacLarty wrote:

> Does using the io equivalence type instead of io.state in these instance
> declarations cause problems?

No, it was something I did while I was working on this change in order
to avoid accidental problems with equivalence types and instances.

> I'd prefer it if we could use the
> equivalence type to be more consistent with the rest of the io module.

Done.

> Otherwise that looks fine.

The NEWS file will also need to be updated to mention all of this but
that can wait until after you've committed the changes to term_to_xml.m
on the main branch.

Julien.
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