Quantified constraints

[Simon Peyton Jones]

Friends
Now that the Quantified Constraints proposal<https://github.com/Gertjan423/ghc-proposals/blob/quantified-constraints/proposals/0000-quantified-constraints.rst> is accepted, I want to commit it to GHC before the 8.6 release.
It's up on https://phabricator.haskell.org/D4724 for your review.  It's rebased on master, and validates clean.
There's also a useful wiki page<https://ghc.haskell.org/trac/ghc/wiki/QuantifiedConstraints>.
Thanks!
Simon

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