[GHC] #7039: Panic due 'instance Foo a => Bar a => Baz a' style declarations

[GHC]

#7039: Panic due 'instance Foo a => Bar a => Baz a' style declarations
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 Reporter:  ksf                 |          Owner:                  
     Type:  bug                 |         Status:  new             
 Priority:  normal              |      Component:  Compiler        
  Version:  7.4.2               |       Keywords:                  
       Os:  Unknown/Multiple    |   Architecture:  Unknown/Multiple
  Failure:  Compile-time crash  |       Testcase:                  
Blockedby:                      |       Blocking:                  
  Related:                      |  
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Comment(by guest):

 seems to be a duplicate of #5951

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7039#comment:1>
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