[GHC] #4349: ASSERT failed! file compiler/types/FamInstEnv.lhs

[GHC]

#4349: ASSERT failed! file compiler/types/FamInstEnv.lhs
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    Reporter:  daniel.is.fischer  |        Owner:                     
        Type:  bug                |       Status:  new                
    Priority:  normal             |    Milestone:                     
   Component:  Compiler           |      Version:  7.1                
    Keywords:                     |     Testcase:                     
   Blockedby:                     |   Difficulty:                     
          Os:  Linux              |     Blocking:                     
Architecture:  x86                |      Failure:  Building GHC failed
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Comment(by simonpj):

 Aha. I didn't have `-DDEBUG` on my ''stage 2'' compiler.   I'll try that,
 and I'm guessing that'll show up the problem.  But I'm at ICFP so not much
 hacking time this week.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4349#comment:8>
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