[GHC] #14933: DeriveAnyClass can cause "No skolem info" GHC panic

[GHC]

#14933: DeriveAnyClass can cause "No skolem info" GHC panic
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        Reporter:  RyanGlScott       |                Owner:  (none)
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:
       Component:  Compiler (Type    |              Version:  8.2.2
  checker)                           |
      Resolution:                    |             Keywords:  deriving
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #14932            |  Differential Rev(s):  Phab:D4507
       Wiki Page:                    |
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Comment (by Simon Peyton Jones <simonpj@…>):

 In [changeset:"2a3702d8950ebdec27357e08caae3b1cd4f8b00d/ghc"
 2a3702d8/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="2a3702d8950ebdec27357e08caae3b1cd4f8b00d"
 Comments and tiny refactor

 Related to Ryan's upcoming patch for Trac #14933
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14933#comment:3>
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