[GHC] #5209: ^C doesn't correctly reset the prompt from within multiline commands in ghci

[GHC]

#5209: ^C doesn't correctly reset the prompt from within multiline commands in
ghci
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        Reporter:  dmwit       |            Owner:  bennofs
            Type:  bug         |           Status:  new
        Priority:  low         |        Milestone:  7.6.2
       Component:  GHCi        |          Version:  7.0.3
      Resolution:              |         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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Comment (by bennofs):

 The bug is trivally fixed by putting the code for resetting the promt in a
 `finally` clause. The attached patch does just that.

 I don't know how I could add a test case for this bug. Is there a way to
 send Ctrl-C to ghci with the current testing infrastructure?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/5209#comment:6>
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