[GHC] #7959: Panic on deriving nullary typeclass

[GHC]

#7959: Panic on deriving nullary typeclass
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    Reporter:  monoidal          |       Owner:  simonpj           
        Type:  bug               |      Status:  patch             
    Priority:  normal            |   Milestone:                    
   Component:  Compiler          |     Version:  7.7               
    Keywords:                    |          Os:  Unknown/Multiple  
Architecture:  Unknown/Multiple  |     Failure:  Compile-time crash
  Difficulty:  Unknown           |    Testcase:                    
   Blockedby:                    |    Blocking:                    
     Related:                    |  
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Comment(by krz.gogolewski@…):

 commit 967f746994802f50011a03c983417a6fca18de27
 {{{
 Author: Krzysztof Gogolewski <krz.gogolewski at gmail.com>
 Date:   Mon Jun 3 17:07:23 2013 +0200

     Fix panic on deriving a nullary typeclass (#7959)

  compiler/typecheck/TcDeriv.lhs |    8 +++++++-
  1 files changed, 7 insertions(+), 1 deletions(-)
 }}}

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7959#comment:3>
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