[GHC] #13043: GHC 7.10->8.0 regression: GHC code-generates duplicate _closures

[GHC]

#13043: GHC 7.10->8.0 regression: GHC code-generates duplicate _closures
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        Reporter:  hvr               |                Owner:
            Type:  bug               |               Status:  merge
        Priority:  normal            |            Milestone:  8.0.3
       Component:  Compiler          |              Version:  8.0.2-rc2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #12595            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 PS thank you for a nice repro case -- made it far easier to find.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13043#comment:9>
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