[GHC] #12021: Type variable escapes its scope

[GHC]

#12021: Type variable escapes its scope
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        Reporter:  ttuegel           |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1-rc3
      Resolution:                    |             Keywords:
Operating System:  Linux             |         Architecture:  x86_64
 Type of failure:  GHC rejects       |  (amd64)
  valid program                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by bgamari):

 * cc: ghc-devs@… (removed)
 * cc: simonpj (added)


Comment:

 CCing Simon.

 There are a few odd things here. I've opened #12055 which describes a
 variant of this program which throws the typechecker into panic.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12021#comment:1>
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