[GHC] #2600: Bind type variables in RULES

[GHC]

#2600: Bind type variables in RULES
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        Reporter:  simonpj           |                Owner:  simonpj
            Type:  feature request   |               Status:  new
        Priority:  lowest            |            Milestone:
       Component:  Compiler          |              Version:  6.8.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #2110             |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by goldfire):

 Ideas to fix this are in [https://github.com/ghc-proposals/ghc-
 proposals/pull/55 this recent proposal].

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/2600#comment:23>
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