[GHC] #1658: CSE changes semantics

[GHC]

#1658: CSE changes semantics
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    Reporter:  guest     |        Owner:         
        Type:  bug       |       Status:  new    
    Priority:  normal    |    Milestone:         
   Component:  Compiler  |      Version:  6.7    
    Severity:  normal    |   Resolution:         
    Keywords:            |   Difficulty:  Unknown
          Os:  Multiple  |     Testcase:         
Architecture:  Multiple  |  
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Comment (by sorear):

 That rule is correct - for all x# :: Int#, x# -# x# is 0#.  Remember -# is
 only usable on integers.  Double subtraction uses -##.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1658>
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