[GHC] #13343: Levity polymorphism-related GHC panic: expectJust zonkTcTyVarToVar

[GHC]

#13343: Levity polymorphism-related GHC panic: expectJust zonkTcTyVarToVar
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        Reporter:  RyanGlScott       |                Owner:  goldfire
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler (Type    |              Version:  8.0.1
  checker)                           |             Keywords:
      Resolution:                    |  LevityPolymorphism
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Richard Eisenberg <rae@…>):

 In [changeset:"02cc8f0c423e85033bdfd26f1492301b724930d8/ghc" 02cc8f0/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="02cc8f0c423e85033bdfd26f1492301b724930d8"
 Fix #13343 by not defaulting SigTvs

 test case: typecheck/should_compile/T13343
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13343#comment:3>
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