[GHC] #14875: -ddump-splices pretty-printing oddities with case statements

[GHC]

#14875: -ddump-splices pretty-printing oddities with case statements
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        Reporter:  RyanGlScott       |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.2.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Debugging         |  Unknown/Multiple
  information is incorrect           |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 Yes, using a precedence argument must be the Right Thing.

 We do this in quite a few places, notably `TyCoRep` and even
 `RtClosureInspect` and `Debugger`.

 Maybe the thing to do is to have
 {{{
 newtype PprPrec = Prec Int deriving( Eq, Ord )
 }}}
 in `BasicTypes` or `Outputable`, and use it for everything.  Then we can
 have local defns like
 {{{
 topPrec = 0
 funPrec = 1
 ...
 }}}
 and the various applications of it won't conflict with each other.

 Maybe `topPrec` can be shared.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14875#comment:3>
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