[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:  new
       Priority:  high                     |         Milestone:  7.8.1
      Component:  GHCi                     |           Version:  7.6.3
       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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 {{{
 Prelude> :set +m
 Prelude> )
 }}}

 Never returns.

 Patch attached.  John's code was buggy and reachable, apparently.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8431>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler