[GHC] #15805: Bug in anyRewritableTyVar

[GHC]

#15805: Bug in anyRewritableTyVar
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        Reporter:  ningning          |                Owner:  ningning
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:
      Resolution:  fixed             |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #14363            |  Differential Rev(s):  Phab:D5263
       Wiki Page:                    |
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Comment (by simonpj):

 Ningning, is there a test case?  Ideally we'd come up with one, knowing
 the bug.

 But not worth losing sleep over if it's hard to do so.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15805#comment:5>
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