[GHC] #16326: Implement visible dependent quantification

[GHC]

#16326: Implement visible dependent quantification
-------------------------------------+-------------------------------------
           Reporter:  RyanGlScott    |             Owner:  (none)
               Type:  task           |            Status:  new
           Priority:  normal         |         Milestone:  8.10.1
          Component:  Compiler       |           Version:  8.7
           Keywords:  GHCProposal    |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:  #15658
Differential Rev(s):                 |         Wiki Page:
-------------------------------------+-------------------------------------
 GHC proposal 35 ([https://github.com/ghc-proposals/ghc-
 proposals/blob/master/proposals/0035-forall-arrow.rst A syntax for visible
 dependent quantification]) has been accepted. This ticket tracks its
 implementation.

 Along with implementing it, we should also document it in the users' guide
 (the subject of #15658).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16326>
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