Surprisinlgy little comment on this proposal.
Perhaps it landed when yous were busy elsewhere.
I'd like to push it to the committee soon;
this is an invitation for more feedback.
Richard E wrote a nice brief summary
https://github.com/ghc-proposals/ghc-proposals/pull/56#issuecomment-311421457
Thank you
AntC
- Original Message Follows -
> After years of pondering this idea (in various forms),
> and several rounds of discussion on several forums,
> I've written it up.
>
> "This proposal tackles the thorny topic of Overlapping
> instances,
> for both type classes and Type Families/Associated types,
> by annotating instance heads with type-level apartness
> Guards.
> Type-level disequality predicates appear in Sulzmann &
> Stuckey 2002;
> in the type-level case selection in HList 2004;
> and in various guises in Haskell cafe discussions in
> following years.
> This proposal builds on the apartness testing implemented
> as part of the Closed Type Families work."
>
> All feedback welcome.
>
>
https://github.com/AntC2/ghc-proposals/blob/instance-apartness-guards/proposals/-instance-apartness-guards.rst
>
> AntC
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