[m-rev.] diff: improve error checking for instance decls

[Mark Brown]

On 25-Oct-2006, Julien Fischer <juliensf at csse.unimelb.edu.au> wrote:
> Emit an error if abstract instances in the implementation of a module do
> not have a corresponding concrete instance.

Why do we even allow abstract instances in the implementation?  (Likewise
for abstract types.)

Cheers,
Mark.

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