[GHC] #2030: GHC internal error: `m' is not in scope

[GHC]

#2030: GHC internal error: `m' is not in scope
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    Reporter:  ToRA            |       Owner:       
        Type:  bug             |      Status:  new  
    Priority:  normal          |   Milestone:       
   Component:  Compiler        |     Version:  6.8.1
    Severity:  normal          |    Keywords:       
  Difficulty:  Unknown         |    Testcase:       
Architecture:  x86_64 (amd64)  |          Os:  Linux
-------------------------------+--------------------------------------------
 Tripped this while trying to use ScopedTypeVariables under 6.8.2

 Have stripped the code down as far as I could simply see while retaining
 the bug.  isSafeAlt seems to be the starting point.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2030>
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