[GHC] #13594: Typechecker behavior w.r.t. BangPatterns and nested foralls has changed in 8.2

[GHC]

#13594: Typechecker behavior w.r.t. BangPatterns and nested foralls has changed in
8.2
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        Reporter:  RyanGlScott       |                Owner:  bgamari
            Type:  bug               |               Status:  patch
        Priority:  high              |            Milestone:  8.2.1
       Component:  Compiler (Type    |              Version:  8.2.1-rc2
  checker)                           |             Keywords:  BangPatterns,
      Resolution:                    |  RankNTypes
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  GHC rejects       |  Unknown/Multiple
  valid program                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D3661
       Wiki Page:                    |
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Comment (by Ben Gamari <ben@…>):

 In [changeset:"6567c815135e93f8550d526f81d13f31c0cd92b6/ghc" 6567c81/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="6567c815135e93f8550d526f81d13f31c0cd92b6"
 Treat banged bindings as FunBinds

 This is another attempt at resolving #13594 by treating strict variable
 binds as FunBinds instead of PatBinds (as suggested in comment:1).

 Test Plan: Validate

 Reviewers: austin, alanz

 Subscribers: rwbarton, thomie, mpickering

 GHC Trac Issues: #13594

 Differential Revision: https://phabricator.haskell.org/D3670
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13594#comment:18>
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