[GHC] #13585: ala from Control.Lens.Wrapped panics

[GHC]

#13585: ala from Control.Lens.Wrapped panics
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        Reporter:  fumieval          |                Owner:  goldfire
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.2.1
       Component:  Compiler (Type    |              Version:
  checker)                           |
      Resolution:                    |             Keywords:  TypeInType
Operating System:  Linux             |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by simonpj):

 * owner:  (none) => goldfire
 * milestone:   => 8.2.1


Comment:

 Following a conversation with Richard, I'm assigning this to him and
 milestoning for 8.2.1.   It should be fixed automatically when he commits
 the changes to `mkCastTy` and fixes for #13333.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13585#comment:9>
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