[GHC] #4488: Warn about unnecessary fromIntegral and other conversions

[GHC]

#4488: Warn about unnecessary fromIntegral and other conversions
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    Reporter:  mitar             |       Owner:              
        Type:  feature request   |      Status:  new         
    Priority:  normal            |   Component:  Compiler    
     Version:  6.12.3            |    Keywords:              
    Testcase:                    |   Blockedby:              
          Os:  Unknown/Multiple  |    Blocking:              
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown
---------------------------------+------------------------------------------
 GHC should report unnecessary fromIntegral and other conversions.
 Sometimes you change the type later on and fromIntegral stays in the code
 but it is not necessary anymore. HLint cannot do that because it does not
 know about types.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4488>
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