[GHC] #8995: When generalising, use levels rather than global tyvars

[GHC]

#8995: When generalising, use levels rather than global tyvars
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        Reporter:  simonpj           |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler (Type    |                 Version:  7.8.2
  checker)                           |
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Changes (by thomie):

 * component:  Compiler => Compiler (Type checker)


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8995#comment:4>
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