[GHC] #12921: initTc: unsolved constraints

[GHC]

#12921: initTc: unsolved constraints
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        Reporter:  jlp               |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler (Type    |              Version:  8.0.1
  checker)                           |
      Resolution:                    |             Keywords:
Operating System:  MacOS X           |         Architecture:  x86_64
 Type of failure:  Compile-time      |  (amd64)
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #13106            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 Thanks.  I debugged this last night and I know what is going on.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12921#comment:4>
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