[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:  closed
        Priority:  normal            |            Milestone:  7.10.1
       Component:  Compiler          |              Version:  7.10.1-rc1
      Resolution:  fixed             |             Keywords:
                                     |  RecordWildcards PatternSynonyms
Operating System:  Unknown/Multiple  |         Architecture:  x86_64
                                     |  (amd64)
 Type of failure:  Compile-time      |            Test Case:
  crash                              |  patsyn/should_compile/T9975a,b
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by adamgundry):

 See also #11283, which is essentially the same bug.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9975#comment:8>
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