[GHC] #12942: Add infix flag for class and data declarations

[GHC]

#12942: Add infix flag for class and data declarations
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        Reporter:  alanz             |                Owner:  alanz
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #3384             |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by alanz):

 And I just realised the issue statement is wrong, the constraints are on
 the `Outputable` instances for the AST, not the AST itself.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12942#comment:3>
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