[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:  closed
        Priority:  normal            |            Milestone:  ⊥
       Component:  Compiler          |              Version:  6.6.1
      Resolution:  duplicate         |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #11438            |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by thomie):

 * status:  new => closed
 * resolution:   => duplicate
 * related:   => #11438


Comment:

 Closing as a duplicate of #9244, which has a more complete test case, and
 suggestions for how to implement this.

 Also reported as #11438.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/1316#comment:10>
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