[GHC] #9975: RecordWildcards and PatternSynonyms cause impossible bug

[GHC]

#9975: RecordWildcards and PatternSynonyms cause impossible bug
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        Reporter:  gamegoblin        |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:  7.10.1
       Component:  Compiler          |                 Version:  7.10.1-rc1
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |  RecordWildcards PatternSynonyms
 Type of failure:  Compile-time      |            Architecture:  x86_64
  crash                              |  (amd64)
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Comment (by cactus):

 Is 7.10.1-rc1 properly tagged in Git? I can't seem to find the exact
 commit corresponding to it.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9975#comment:4>
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