[GHC] #1489: Impossible happened

[GHC]

#1489: Impossible happened
--------------------------------+-------------------------------------------
  Reporter:  iampure at gmail.com  |          Owner:         
      Type:  bug                |         Status:  new    
  Priority:  highest            |      Milestone:         
 Component:  Compiler           |        Version:  6.7    
  Severity:  blocker            |       Keywords:         
Difficulty:  Unknown            |             Os:  Unknown
  Testcase:                     |   Architecture:  Unknown
--------------------------------+-------------------------------------------
ghc-6.7.20070702: panic! (the 'impossible' happened)
   (GHC version 6.7.20070702 for i386-unknown-linux):
         nameModule $dMonad{v a1BV5}

 Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

 Unfortunately, I have no test case, but it happened during the evaluation
 of something of type IO ([(Int, Int)]) which uses undecidable instances,
 functional dependencies and the no monomorphism restriction.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1489>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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