[GHC] #14268: Implement Explicit Foralls Proposal

[GHC]

#14268: Implement Explicit Foralls Proposal
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           Reporter:  johnleo        |             Owner:  (none)
               Type:  task           |            Status:  new
           Priority:  normal         |         Milestone:  8.4.1
          Component:  Compiler       |           Version:  8.2.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 Implement Richard Eisenberg's Explicit Foralls proposal.
 https://github.com/ghc-proposals/ghc-proposals/pull/55

 For details see the proposal:
 https://github.com/goldfirere/ghc-proposals/blob/instance-
 forall/proposals/0000-instance-foralls.rst

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14268>
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