[GHC] #7900: The impossible happend

[GHC]

#7900: The impossible happend
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    Reporter:  dhjdhj            |        Owner:                  
        Type:  bug               |       Status:  closed          
    Priority:  normal            |    Component:  Compiler        
     Version:  7.4.2             |   Resolution:  duplicate       
    Keywords:                    |           Os:  Unknown/Multiple
Architecture:  Unknown/Multiple  |      Failure:  None/Unknown    
   Blockedby:                    |     Blocking:                  
     Related:                    |  
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Changes (by monoidal):

  * status:  new => closed
  * resolution:  => duplicate


Comment:

 Almost certainly this is a duplicate of #5951 - you have a malformed class
 declaration (for example, you wrote `instance A => B => C` or `instance A
 -> B`). If this is not a case, please reopen pasting the source code
 causing the error.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7900#comment:1>
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