[GHC] #13932: GHC and GHCi dumps "panic!" ("initTc: unsolved constraints")

[GHC]

#13932: GHC and GHCi dumps "panic!" ("initTc: unsolved constraints")
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        Reporter:  aiya000           |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Linux             |         Architecture:  x86_64
 Type of failure:  Compile-time      |  (amd64)
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by aiya000):

 I use makeLensesFor instead of my makeLensesA.

 Is this microlens's problem ?

 https://github.com/aiya000/hs-
 zuramaru/commit/3980ea2833fa346592745d1bf15f86f6bb444d88

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13932#comment:3>
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