[GHC] #12007: Pattern families regression

[GHC]

#12007: Pattern families regression
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        Reporter:  MikeIzbicki       |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by MikeIzbicki):

 Replying to [comment:4 mpickering]:
 > So I could trigger the same panic with the example here
 https://ghc.haskell.org/trac/ghc/ticket/11549#comment:1 with rc-3
 >
 > but it is fixed in HEAD.
 >

 I just updated my GHC repo and rebuilt GHC today before submitting, so I
 thought I tested it with HEAD.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12007#comment:5>
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