[GHC] #10735: Smooth out the differences between `compiler/utils/Pretty.hs` and `libraries/pretty`

[GHC]

#10735: Smooth out the differences between `compiler/utils/Pretty.hs` and
`libraries/pretty`
-------------------------------------+-------------------------------------
        Reporter:  thomie            |                   Owner:  thomie
            Type:  task              |                  Status:  new
        Priority:  normal            |               Milestone:  7.12.1
       Component:  Compiler          |                 Version:  7.0.1
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:  #1062, #1176,     |  Differential Revisions:
  #7666, #8809                       |
-------------------------------------+-------------------------------------
Changes (by thomie):

 * related:  #1062, #1176, #7666 => #1062, #1176, #7666, #8809


Comment:

 Ok, maybe you want to comment on
 https://github.com/haskell/pretty/issues/1#issuecomment-78297997, where
 Trevor Elliott said:

   "I was hoping to extend the GHC pretty printer with the annotations, to
 get functionality like in the idris repl. Maybe extending their forked
 version with the annotations is the right path forward for that work :)"

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10735#comment:3>
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