[GHC] #7777: ghc panic: varargs + sets

[GHC]

#7777: ghc panic: varargs + sets
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    Reporter:  litherum                                                                             |        Owner:                    
        Type:  bug                                                                                  |       Status:  closed            
    Priority:  normal                                                                               |    Component:  Compiler          
     Version:  7.4.1                                                                                |   Resolution:  duplicate         
    Keywords:  MultiParamTypeClasses FunctionalDependencies FlexibleInstances UndecidableInstances  |           Os:  Linux             
Architecture:  Unknown/Multiple                                                                     |      Failure:  Compile-time crash
   Blockedby:                                                                                       |     Blocking:                    
     Related:                                                                                       |  
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Changes (by monoidal):

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


Comment:

 The panic is caused by:

 {{{
 instance Ord a => BuildSet a b => BuildSet a (a -> b)
 }}}

 which should be `(Ord a, BuildSet a b) => BuildSet a (a -> b)`. The error
 message is already fixed in GHC 7.6, see bug #5951.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7777#comment:2>
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