[GHC] #10287: ApiAnnotations : BooleanFormula construction discards original

[GHC]

#10287: ApiAnnotations : BooleanFormula construction discards original
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              Reporter:  alanz       |             Owner:  alanz
                  Type:  bug         |            Status:  new
              Priority:  normal      |         Milestone:  7.10.2
             Component:  Compiler    |           Version:  7.10.1
              Keywords:              |  Operating System:  Unknown/Multiple
  ApiAnnotations                     |   Type of failure:  None/Unknown
          Architecture:              |        Blocked By:
  Unknown/Multiple                   |   Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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 The MINIMAL pragma is captured in the parser using a `BooleanFormula`.

 The constructors (`mkBool`,`mkAnd`,`mkOr`) are smart and try to minimise
 the boolean formula as it is constructed.

 This discards the original information, making round tripping impossible.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10287>
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