[GHC] #11811: GHC sometimes misses a CUSK

[GHC]

#11811: GHC sometimes misses a CUSK
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        Reporter:  goldfire          |                Owner:  goldfire
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:  TypeInType
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 <eir@…>):

 In [changeset:"b1084fd700e6bbe9d0d787046a6aabdb193982c4/ghc"
 b1084fd7/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="b1084fd700e6bbe9d0d787046a6aabdb193982c4"
 Fix #11811.

 Previously, I had forgotten to omit variables already in scope
 from the TypeInType CUSK check. Simple enough to fix.

 Test case: typecheck/should_compile/T11811
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11811#comment:2>
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