[GHC] #3399: Generalize the type of Data.List.{deleteBy, deleteFirstsBy}

[GHC]

#3399: Generalize the type of Data.List.{deleteBy, deleteFirstsBy}
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 Reporter:  iago              |          Owner:                  
     Type:  proposal          |         Status:  new             
 Priority:  normal            |      Milestone:                  
Component:  libraries/base    |        Version:  6.10.4          
 Severity:  normal            |     Resolution:                  
 Keywords:                    |       Testcase:                  
       Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
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Comment (by iago):

 The proposal doesn't require change code itself, it is just use the more
 general type signature instead of restrict it unnecessary. The change
 wouldn't break any code.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3399#comment:3>
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