[GHC] #3275: ghc: panic! (the 'impossible' happened)

[GHC]

#3275: ghc: panic! (the 'impossible' happened)
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    Reporter:  EricKow   |        Owner:         
        Type:  bug       |       Status:  new    
    Priority:  normal    |    Milestone:  6.10.4 
   Component:  Compiler  |      Version:  6.10.3 
    Severity:  normal    |   Resolution:         
    Keywords:            |   Difficulty:  Unknown
    Testcase:            |           Os:  MacOS X
Architecture:  x86       |  
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Comment (by GregoryCollins):

 As a workaround, you can run:
 {{{
     sudo cabal install -O2 --reinstall regex-base regex-compat regex-posix
 }}}
 which seems to clear up the problem for me. The underlying issue still
 remains.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3275#comment:8>
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