[GHC] #12512: UnboxedTupleRep-related panic involving typeclasses

[GHC]

#12512: UnboxedTupleRep-related panic involving typeclasses
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        Reporter:  RyanGlScott       |                Owner:  goldfire
            Type:  bug               |               Status:  merge
        Priority:  normal            |            Milestone:  8.0.2
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash                              |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #11723            |  Differential Rev(s):  Phab:D2557
       Wiki Page:                    |
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Comment (by bgamari):

 Merged to `ghc-8.0 ` as c448d5513d68da7077b2b4d3adadda93120d8504.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12512#comment:5>
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