[GHC] #2927: Bug in network library, uncaught exception when dealing with ipv6 sockets

[GHC]

#2927: Bug in network library, uncaught exception when dealing with ipv6 sockets
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    Reporter:  tphyahoo           |        Owner:  bos             
        Type:  bug                |       Status:  assigned        
    Priority:  normal             |    Milestone:                  
   Component:  libraries/network  |      Version:  6.10.1          
    Severity:  normal             |   Resolution:                  
    Keywords:  ipv6               |   Difficulty:  Unknown         
    Testcase:                     |           Os:  Unknown/Multiple
Architecture:  Unknown/Multiple   |  
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Changes (by igloo):

  * difficulty:  => Unknown

Comment:

 FWIW, I think `liftM fst` is clearer than `return . fst =<< `.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2927#comment:4>
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