[GHC] #11028: Refactor ConDecl

[GHC]

#11028: Refactor ConDecl
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        Reporter:  simonpj           |                Owner:  alanz
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.10.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by alanz):

 `tcConDecl` returns a `DataCon`.

 For `ConDeclGADT`, should I bring in a function

 {{{#!hs
 gadtDeclDetails :: LHsSigType name -> HsConDeclDetails name
 gadtDeclDetails (HsIB {hsib_body = lbody_ty}) = details
   where
     (tvs, cxt, tau) = splitLHsSigmaTy lbody_ty
     details           -- See Note [Sorting out the result type]
       = case tau of
           L _ (HsFunTy (L l (HsRecTy flds)) res_ty)
                   -> RecCon (L l flds)
           _other  -> PrefixCon []
 }}}

 and then proceed with the process as it is now? Should there be a call to
 `tcHsSigType`?

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11028#comment:18>
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