[GHC] #3263: Warnings for monadic values not used

[GHC]

#3263: Warnings for monadic values not used
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    Reporter:  NeilMitchell      |        Owner:  igloo           
        Type:  feature request   |       Status:  new             
    Priority:  normal            |    Milestone:  6.12.1          
   Component:  Compiler          |      Version:  6.10.2          
    Severity:  normal            |   Resolution:                  
    Keywords:                    |   Difficulty:  Unknown         
    Testcase:                    |           Os:  Unknown/Multiple
Architecture:  Unknown/Multiple  |  
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Comment (by simonmar):

 I've fixed the GHC.IO.Encoding modules.

 {{{
 Mon Jul  6 14:33:03 BST 2009  Simon Marlow <marlowsd at gmail.com>
   * Use the result of writeCharBuf
 }}}

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3263#comment:10>
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