[GHC] #7458: ghc panic

[GHC]

#7458: ghc panic
-------------------------+--------------------------------------------------
    Reporter:  timsears  |       Owner:                    
        Type:  bug       |      Status:  infoneeded        
    Priority:  normal    |   Milestone:                    
   Component:  Compiler  |     Version:  7.4.1             
    Keywords:            |          Os:  Linux             
Architecture:  x86       |     Failure:  Compile-time crash
  Difficulty:  Unknown   |    Testcase:                    
   Blockedby:            |    Blocking:                    
     Related:            |  
-------------------------+--------------------------------------------------
Description changed by igloo:

Old description:

> As ghc requested I am reporting this...
> All I can say right now is that I am tracking down a bug involving
> overlapping instances.
>
> ghc: panic! (the 'impossible' happened)
>   (GHC version 7.4.1 for i386-unknown-linu
>         tcTyVarDetails
>     ( t{tv acw0} [tv] :: ghc-prim:GHC.Prim.*{(w) tc 34d} )
>
> Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

New description:

 As ghc requested I am reporting this...
 All I can say right now is that I am tracking down a bug involving
 overlapping instances.
 {{{
 ghc: panic! (the 'impossible' happened)
   (GHC version 7.4.1 for i386-unknown-linu
         tcTyVarDetails
     ( t{tv acw0} [tv] :: ghc-prim:GHC.Prim.*{(w) tc 34d} )

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

--

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7458#comment:4>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler