[GHC] #15323: mkGadtDecl does not set con_forall correctly

[GHC]

#15323: mkGadtDecl does not set con_forall correctly
-------------------------------------+-------------------------------------
           Reporter:  alanz          |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:  8.6.1
          Component:  Compiler       |           Version:  8.4.3
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 A GADT declaration surrounded in parens does not det the `con_forall`
 field correctly.

 e.g.

 {{{#!hs
 data MaybeDefault v where
     TestParens  :: (forall v . (Eq v) => MaybeDefault v)
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15323>
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