Commits on Dec 5, 2022

1. Adapt to NuMatchingAny1 becoming a quantified constraint …

   This makes the necessary changes to adapt to eddywestbrook/hobbits#8,
   which turns `NuMatchingAny1` into an alias for a quantified `NuMatching`
   constraint. See #1742 and https://gitlab.haskell.org/ghc/ghc/-/issues/22492 for
   the motivation behind this.
   
   One unfortunate hiccup with this patch is that combining quantified superclasses
   and `TypeFamilies` doesn't quite work out of the box on pre-9.2 GHCs due to
   https://gitlab.haskell.org/ghc/ghc/-/issues/14860. As a result, I have to
   introduce explicit equality constraints to work around the issue. I have added
   a `Note [QuantifiedConstraints + TypeFamilies trick]` to describe why the
   workaround is necessary.
   
   Credit goes to Matthew Pickering for helping me identify this issue and for
   authoring a separate fix. I have tweaked his fix and turned it into this patch,
   adding him as a co-author in the process.
   
   Fixes #1742.
   
   Co-authored-by: Matthew Pickering <matthewtpickering@gmail.com>

   

   RyanGlScott and mpickering committed Dec 5, 2022
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