[GHC] #7742: StandaloneDeriving on Read fails for GADTs

[GHC]

#7742: StandaloneDeriving on Read fails for GADTs
---------------------------------+------------------------------------------
    Reporter:  hoffstaetter      |        Owner:                           
        Type:  bug               |       Status:  closed                   
    Priority:  normal            |    Component:  Compiler                 
     Version:  7.6.2             |   Resolution:  invalid                  
    Keywords:                    |           Os:  MacOS X                  
Architecture:  Unknown/Multiple  |      Failure:  GHC rejects valid program
   Blockedby:                    |     Blocking:                           
     Related:                    |  
---------------------------------+------------------------------------------
Changes (by monoidal):

  * status:  new => closed
  * resolution:  => invalid


Comment:

 I agree with kosmikus. {{{instance Show (Foo a)}}} can be written
 manually, while {{{instance Read (Foo a)}}} cannot.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7742#comment:2>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler