[GHC] #1683: strange MVar / UnsafePerformIO (and type checker...) behaviour

[GHC]

#1683: strange MVar / UnsafePerformIO (and type checker...) behaviour
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    Reporter:  komuves at renyi.hu                    |        Owner:         
        Type:  bug                                 |       Status:  closed 
    Priority:  normal                              |    Milestone:         
   Component:  Compiler                            |      Version:  6.6.1  
    Severity:  normal                              |   Resolution:  invalid
    Keywords:  MVar, UnsafePerformIO, typechecker  |   Difficulty:  Unknown
          Os:  Unknown                             |     Testcase:         
Architecture:  Unknown                             |  
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Changes (by igloo):

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

Comment:

 Thanks for the report! However, you are unsafely (with the help of
 unsafePerformIO) coercing an Int to a Word8. The behaviour is undefined.
 It happens that with GHC's implementation you end up with a sequence of
 bits that doesn't make a valid value for the type.


 Thanks

 Ian

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1683>
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