[GHC] #7494: Allow compatible type synonyms to be the return type of a GADT data constructor.

[GHC]

#7494: Allow compatible type synonyms to be the return type of a GADT data
constructor.
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    Reporter:  topi                     |       Owner:                  
        Type:  feature request          |      Status:  new             
    Priority:  normal                   |   Milestone:                  
   Component:  Compiler (Type checker)  |     Version:  7.4.1           
    Keywords:  GADT                     |          Os:  Unknown/Multiple
Architecture:  Unknown/Multiple         |     Failure:  None/Unknown    
  Difficulty:  Unknown                  |    Testcase:                  
   Blockedby:                           |    Blocking:                  
     Related:                           |  
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Comment(by topi):

 Replying to [comment:1 simonpj]:
 I stumbled upon this while writing a monad transformer. I do not have any
 urgent reason to have this feature. It just seemed like a natural
 extension that would be simple to add.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7494#comment:2>
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