[GHC] #1316: add warning for local type signatures that use the same type variable names as outer type signatures

[GHC]

#1316: add warning for local type signatures that use the same type variable names
as outer type signatures
---------------------------------+------------------------------------------
    Reporter:  Isaac Dupree      |        Owner:  simonpj         
        Type:  feature request   |       Status:  new             
    Priority:  normal            |    Milestone:  _|_             
   Component:  Compiler          |      Version:  6.6.1           
    Severity:  normal            |   Resolution:                  
    Keywords:                    |   Difficulty:  Unknown         
    Testcase:                    |           Os:  Unknown/Multiple
Architecture:  Unknown/Multiple  |  
---------------------------------+------------------------------------------
Changes (by igloo):

  * milestone:  6.10 branch => _|_

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1316#comment:7>
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