[GHC] #7931: Deriving Read of an empty datatype crashes

[GHC]

#7931: Deriving Read of an empty datatype crashes
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Reporter:  monoidal          |          Owner:                  
    Type:  bug               |         Status:  patch           
Priority:  normal            |      Component:  Compiler        
 Version:  7.6.3             |       Keywords:                  
      Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
 Failure:  None/Unknown      |      Blockedby:                  
Blocking:                    |        Related:                  
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Comment(by parcs):

 > (Oddly, the "panic" message is given only by ghc, not ghci, but this is
 minor.)

 That should be fixed in HEAD

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7931#comment:2>
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