[GHC] #13887: Template Haskell pretty-printer doesn't parenthesize infix datatype names in data declarations

[GHC]

#13887: Template Haskell pretty-printer doesn't parenthesize infix datatype names
in data declarations
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        Reporter:  RyanGlScott       |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Template Haskell  |              Version:  8.0.1
      Resolution:                    |             Keywords:  newcomer
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect result  |  Unknown/Multiple
  at runtime                         |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by ak3n):

 Yep, I tried to run the whole test suite and it finished with 417
 unexpected failures.

 Thanks for pointing out `pprParendType`! I didn't find it yesterday.

 Also, should we change `pprParendType (VarT v)            = ppr v` too?
 Because of `pprExp _ (VarE v)     = pprName' Applied v`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13887#comment:3>
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