[m-dev.] file streams

[Ralph Becket]

> From: Michael Day [mailto:mcda at cat.cs.mu.OZ.AU]
> 
> :- type file__duplex.
> :- instance stream__stream(file__duplex).
> :- instance stream__input(file__duplex).
> :- instance stream__output(file__duplex).
> :- instance stream__duplex(file__duplex).
> :- instance stream__seekable(file__duplex).

Isn't `instance stream__duplex' implied by 
`instance stream__{in,out}put'?  Or is the
declaration necessary?

Ralph
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