[GHC] #6055: panic: ctFlavId: derived constraint cannot have id

[GHC]

#6055: panic: ctFlavId: derived constraint cannot have id
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 Reporter:  Lemming             |          Owner:                         
     Type:  bug                 |         Status:  new                    
 Priority:  normal              |      Component:  Compiler (Type checker)
  Version:  7.5                 |       Keywords:                         
       Os:  Unknown/Multiple    |   Architecture:  Unknown/Multiple       
  Failure:  Compile-time crash  |       Testcase:                         
Blockedby:                      |       Blocking:                         
  Related:                      |  
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Comment(by dimitris):

 My bad, I know what is going on. It's a silly mistake (but I am amazed our
 testsuite did not show this yet!). I will push the fix and add the
 testsuite in a couple of hours. Many thanks for this testcase!

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/6055#comment:1>
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