[GHC] #13202: Levity polymorphism panic in GHCi

[GHC]

#13202: Levity polymorphism panic in GHCi
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        Reporter:  bgamari           |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
                                     |  LevityPolymorphism
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Richard Eisenberg <rae@…>):

 In [changeset:"fa13c136e6e666b9a1393c1c0041020ad842c069/ghc"
 fa13c136/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="fa13c136e6e666b9a1393c1c0041020ad842c069"
 Fix #13202 by failing more eagerly in tcRnStmt

 test cases: ghci/scripts/T13202{,a}
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13202#comment:3>
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