[GHC] #8878: Export runTcInteractive from TcRnDriver

[GHC]

#8878: Export runTcInteractive from TcRnDriver
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       Reporter:  holzensp                 |             Owner:
           Type:  feature request          |            Status:  new
       Priority:  lowest                   |         Milestone:  7.8.1
      Component:  Compiler                 |           Version:  7.6.3
       Keywords:                           |  Operating System:
   Architecture:  Unknown/Multiple         |  Unknown/Multiple
     Difficulty:  Easy (less than 1 hour)  |   Type of failure:
     Blocked By:                           |  None/Unknown
Related Tickets:                           |         Test Case:
                                           |          Blocking:
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 For people writing more involved code onto GHC than the normal API
 (GHC.hs) allows, this is a very useful function. In previous versions of
 GHC, it has always been unclear to me how I should run the type checker
 on, for example, a single expression, while keeping the context (i.e. when
 running the type checker again, the types derived in the former run should
 still be known in the latter). Simply having runTcInteractive exported
 does wonders for self-documentation purposes.

 (patch to follow shortly)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8878>
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