#7178: Panic in coVarsOfTcCo
---------------------------------+------------------------------------------
    Reporter:  simonpj           |       Owner:                  
        Type:  bug               |      Status:  new             
    Priority:  highest           |   Milestone:  7.6.1           
   Component:  Compiler          |     Version:  7.4.2           
    Keywords:                    |          Os:  Unknown/Multiple
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown    
  Difficulty:  Unknown           |    Testcase:                  
   Blockedby:                    |    Blocking:                  
     Related:                    |  
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 Ganesh says: I'm getting the panic below when building darcs 2.8 with GHC
 7.6. It'll take some effort to cut it down or give repro instructions for
 an uncut-down version (I needed to hack a lot of underlying packages to be
 able to even get as far as doing this build), so could someone confirm
 that it's worth it before I do so? I can't spot anything already reporting
 this in trac.
 {{{
 ghc.exe: panic! (the 'impossible' happened)
   (GHC version 7.6.0.20120810 for i386-unknown-mingw32):
         coVarsOfTcCo:Bind
     cobox{v a6Czs} [lid]
       = cobox{v a6CTr} [lid] `cast`
 (<main:Darcs.Test.Patch.WithState.WithState{tc r1LL8}
                                         model{tv tC} [tv]
    ..blah blah..
 }}}

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7178>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler

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