[GHC] #11024: Fix strange parsing of BooleanFormula

[GHC]

#11024: Fix strange parsing of BooleanFormula
-------------------------------------+-------------------------------------
        Reporter:  mpickering        |                Owner:  ethercrow
            Type:  task              |               Status:  patch
        Priority:  low               |            Milestone:
       Component:  Compiler          |              Version:  7.10.2
  (Parser)                           |
      Resolution:                    |             Keywords:  newcomer
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |  https://phabricator.haskell.org/D3139
-------------------------------------+-------------------------------------
Changes (by ethercrow):

 * status:  new => patch
 * differential:   => https://phabricator.haskell.org/D3139


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11024#comment:7>
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