[m-rev.] for review: constraints on ground types

[Ralph Becket]

Mark Brown, Tuesday, 24 September 2002:
> Hi,
> 
> This is in response to the issue that came up recently on this list
> regarding allowing typeclass constraints on ground types.  This is for
> review by anyone.
> 
> Cheers,
> Mark.
> 
> Estimated hours taken: 3
> Branches: main
> 
> Allow typeclass constraints on ground types.

Does this mean we can now write things like

:- type hash_table(K, V) <= hashable(K).

or only

:- instance hashable(int) where [...].

or have I misunderstood something?

- Ralph
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