Overlapping and incoherent instances

[Stephen Paul Weber]

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>I suppose that -XOverlappingInstances could mean "silently honour 
>OVERLAPPABLE/OVERLAPPING pragmas", while lacking it would mean "honour 
>OVERLAPPABLE/OVERLAPPING pragmas, but emit noisy warnings" or even "don't 
>honour them and warn".
>
>But that is different to the behaviour today, so we'd need a new LANGUAGE 
>pragma.  Perhaps -XHonourOverlappingInstances or something.

This would be a reasonable alternative to the keyword-based solution.  At 
least for now.
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