[GHC] #1318: add warning for prefix negate operator and flag to replace it with negative numeric literals

[GHC]

#1318: add warning for prefix negate operator and flag to replace it with negative
numeric literals
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        Reporter:  Isaac Dupree      |                Owner:  (none)
            Type:  feature request   |               Status:  closed
        Priority:  normal            |            Milestone:  ⊥
       Component:  Compiler          |              Version:  6.6.1
  (Parser)                           |
      Resolution:  wontfix           |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect         |  Unknown/Multiple
  warning at compile-time            |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by bgamari):

 * status:  new => closed
 * resolution:   => wontfix


Comment:

 We have `-XNegativeLiterals` now but I don't think that removing the `-`
 operator is going  to happen at this point.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/1318#comment:6>
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