[GHC] #14245: Make ScopedTypedVariables be effective for any type signature

[GHC]

#14245: Make ScopedTypedVariables be effective for any type signature
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        Reporter:  jeltsch           |                Owner:  (none)
            Type:  feature request   |               Status:  closed
        Priority:  normal            |            Milestone:
       Component:  Compiler (Type    |              Version:  8.2.1
  checker)                           |
      Resolution:  invalid           |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #12540            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by jeltsch):

 Note that the way `ScopedTypeVariables` works for instance declarations
 nowadays already breaks Haskell 98/2010 code.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14245#comment:4>
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