[GHC] #10934: Iface type variable out of scope

[GHC]

#10934: Iface type variable out of scope
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        Reporter:  mjmrotek          |                Owner:
            Type:  bug               |               Status:  merge
        Priority:  high              |            Milestone:  7.10.3
       Component:  Compiler          |              Version:  7.10.2
      Resolution:                    |             Keywords:  interface
Operating System:  Linux             |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Compile-time      |            Test Case:
  crash                              |  polykinds/T10934
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
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Comment (by mjmrotek):

 Thanks! Just for the record, in case someone runs into a similar problem:
 a "workaround" for this bug in the particular case I've posted was just to
 remove the offending type class, as its method can be implemented by just
 having a regular function pattern match on Rec.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10934#comment:6>
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