[GHC] #9748: Disambiguate IO actions in GHCi with :set +t

[GHC]

#9748: Disambiguate IO actions in GHCi with :set +t
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              Reporter:              |            Owner:  zudov
  Iceland_jack                       |           Status:  new
                  Type:  feature     |        Milestone:
  request                            |          Version:  7.8.2
              Priority:  low         |         Keywords:
             Component:  GHCi        |     Architecture:  Unknown/Multiple
            Resolution:              |       Difficulty:  Easy (less than 1
      Operating System:              |  hour)
  Unknown/Multiple                   |       Blocked By:
       Type of failure:              |  Related Tickets:
  None/Unknown                       |
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Comment (by hvr):

 Replying to [comment:3 simonpj]:
 > I quite like Herert's suggestion.  Or
 > {{{
 > Prelude> return 'a'
 > Running IO action...
 > 'a'
 > it :: Char
 > }}}

 This has the risk of interleaving with other side-effected output the `IO`
 action may produce

 > or
 > {{{
 > Prelude> return 'a'
 > it :: Char  -- After running the IO action
 > }}}

 This has the issue of introducing an English sentence which may require
 translation to other language (should GHCi ever be i18n'ed), as well as
 using up precious horizontal space for a boilerplate expression. I'd
 rather avoid adding natural language in places where a more terse
 annotation would suffice

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9748#comment:5>
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