[GHC] #3809: template-haskell 2.4 fails to compile with base 4.1

[GHC]

#3809: template-haskell 2.4 fails to compile with base 4.1
---------------------------------+------------------------------------------
    Reporter:  benmachine        |       Owner:                   
        Type:  bug               |      Status:  new              
    Priority:  normal            |   Component:  libraries (other)
     Version:  6.10.4            |    Keywords:                   
          Os:  Unknown/Multiple  |    Testcase:                   
Architecture:  Unknown/Multiple  |     Failure:  Other            
---------------------------------+------------------------------------------
 The problem is !CharConstr, which doesn't exist in Data.Data prior to base
 4.2. I suppose the easiest fix is to update the build-depends in the cabal
 file.

 But for what it's worth I had a look and the mention of !CharConstr is so
 brief that I wonder if it's not worth factoring it out somehow in a way
 that maintains compatibility – commenting out that single two-line case
 branch allows the build to complete fine.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3809>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler