[GHC] #8431: ghci freezes in multiline when passed a closing paren

[GHC]

#8431: ghci freezes in multiline when passed a closing paren
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        Reporter:  errge       |            Owner:
            Type:  bug         |           Status:  patch
        Priority:  high        |        Milestone:  7.8.1
       Component:  GHCi        |          Version:  7.6.3
      Resolution:              |         Keywords:
Operating System:              |     Architecture:  Unknown/Multiple
  Unknown/Multiple             |       Difficulty:  Easy (less than 1 hour)
 Type of failure:  Other       |       Blocked By:
       Test Case:              |  Related Tickets:
        Blocking:              |
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Comment (by hvr):

 Can this bug also be triggered via ordinary compilation by enabling
 prime:AlternativeLayoutRule?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8431#comment:3>
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