[GHC] #9244: Compiler could warn about type variable shadowing, and hint about ScopedTypeVariables

[GHC]

#9244: Compiler could warn about type variable shadowing, and hint about
ScopedTypeVariables
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        Reporter:  stusmith          |                Owner:  kanetw
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:  8.4.1
       Component:  Compiler          |              Version:  7.6.3
      Resolution:                    |             Keywords:
                                     |  TypeErrorMessages
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect         |  Unknown/Multiple
  warning at compile-time            |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #1316, #3691,     |  Differential Rev(s):
  #11438, #10581, #11539, #12716     |
       Wiki Page:                    |
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Changes (by kanetw):

 * owner:  (none) => kanetw


Comment:

 Working on this, but it seems pretty complicated.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9244#comment:10>
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