[GHC] #8776: Displaying pattern synonym for a GADT

[GHC]

#8776: Displaying pattern synonym for a GADT
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        Reporter:  monoidal          |            Owner:  cactus
            Type:  bug               |           Status:  new
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          Version:  7.7
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Changes (by cactus):

 * owner:   => cactus


Comment:

 OK I have pushed a prototype implementation of that to the `T8776` branch.
 It changes `ppr_ty_thing` to go via the `IfaceDecl`, but only for
 `PatSynCon`, since `tyThingToIfaceDecl` doesn't work for `RealDataCon`s.
 If you think that makes sense, I can clean it up somewhat (by removing
 remnants of the old way to print `PatSynCon` `TyThing`s) and merge it to
 `master`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8776#comment:7>
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