[GHC] #14005: Explore moving from pretty to prettyprinter

[GHC]

#14005: Explore moving from pretty to prettyprinter
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        Reporter:  bgamari           |                Owner:  (none)
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:  8.4.1
       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:                    |  Differential Rev(s):  Phab:D3650
       Wiki Page:                    |
  wiki:PrettyErrors                  |
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Comment (by bgamari):

 One issue is that `prettyprinter` lacks an analogue to `pretty`'s `($$)`
 operator, which has `empty` as an identity. See
 https://github.com/quchen/prettyprinter/issues/34.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14005#comment:5>
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