[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 simonpj):

 I think you should just move the check to the typechecker.

 It's there to stop you writing
 {{{
 f :: { x::Int } -> Int
 f = blah
 }}}
 in normal code.  But the renamer now treats a GADT constructor type
 uniformly, so we don't want to reject it.  The type checker treats them
 differently, so it can reject `HsRecTy` in ordinary types but not in GADTs

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11028#comment:27>
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