[GHC] #8751: Show parenthesised output of expressions in ghci

[GHC]

#8751: Show parenthesised output of expressions in ghci
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              Reporter:              |            Owner:
  Iceland_jack                       |           Status:  infoneeded
                  Type:  feature     |        Milestone:  7.10.1
  request                            |          Version:  7.6.3
              Priority:  normal      |         Keywords:
             Component:  GHCi        |     Architecture:  Unknown/Multiple
            Resolution:              |       Difficulty:  Unknown
      Operating System:              |       Blocked By:
  Unknown/Multiple                   |  Related Tickets:
       Type of failure:              |
  None/Unknown                       |
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Changes (by thoughtpolice):

 * status:  patch => infoneeded
 * milestone:   => 7.10.1


Comment:

 Please:

  - Add documentation about the new parameter.
  - Add some tests.
  - Squash these commits together (easier to land all at once.)

 Thanks!

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8751#comment:4>
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