[GHC] #15285: "strange closure type" in T7919 with the threaded2 way

[GHC]

#15285: "strange closure type" in T7919 with the threaded2 way
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        Reporter:  alpmestan         |                Owner:  (none)
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:
       Component:  Runtime System    |              Version:  8.5
      Resolution:                    |             Keywords:
Operating System:  Linux             |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Runtime crash     |            Test Case:  T7919
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D5115
       Wiki Page:                    |
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Comment (by alpmestan):

 I think this was an error that I first saw on Circle CI, the slow validate
 job, and that I then managed to reproduce locally yes. I will trigger
 another slow validate job against your diff, will post the link to the
 circle ci build once it has started.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15285#comment:4>
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