[GHC] #7395: DefaultSignatures conflict with default implementations

[GHC]

#7395: DefaultSignatures conflict with default implementations
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 Reporter:  cgaebel                    |          Owner:                         
     Type:  bug                        |         Status:  new                    
 Priority:  normal                     |      Component:  Compiler               
  Version:  7.6.1                      |       Keywords:  DefaultSignatures      
       Os:  Unknown/Multiple           |   Architecture:  Unknown/Multiple       
  Failure:  GHC rejects valid program  |       Testcase:  http://hpaste.org/77290
Blockedby:                             |       Blocking:                         
  Related:                             |  
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 Default signatures cannot be used with default implementations.

 This is quite annoying for the hashable package, as we'd like to provide
 both options to the user.

 See the attached test case.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7395>
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