[GHC] #7401: Can't derive instance for Eq when datatype has no constructor, while it is trivial do do so. (was: Can't derive instance for Eq when datatype has no constructor, when it's trivial do do so.)

[GHC]

#7401: Can't derive instance for Eq when datatype has no constructor, while it is
trivial do do so.
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Reporter:  jpbernardy                 |          Owner:                  
    Type:  feature request            |         Status:  new             
Priority:  normal                     |      Component:  Compiler        
 Version:  7.6.1                      |       Keywords:  deriving        
      Os:  Unknown/Multiple           |   Architecture:  Unknown/Multiple
 Failure:  GHC rejects valid program  |      Blockedby:                  
Blocking:                             |        Related:                  
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7401#comment:2>
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