[GHC] #13793: Simple program trips checkNurserySanity()

[GHC]

#13793: Simple program trips checkNurserySanity()
-------------------------------------+-------------------------------------
           Reporter:  niteria        |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Runtime        |           Version:  8.3
  System                             |
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:  x86_64         |   Type of failure:  None/Unknown
  (amd64)                            |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 Error:
 {{{
 Repro: internal error: ASSERTION FAILED: file rts/sm/Sanity.c, line 713

     (GHC version 8.3.20170606 for x86_64_unknown_linux)
     Please report this as a GHC bug:
 http://www.haskell.org/ghc/reportabug
 }}}

 Repro steps:
 * Add `GhcRTSWays += thr_debug` to `mk/build.mk` to build threaded debug
 runtime
 {{{
 inplace/bin/ghc-stage2 -fforce-recomp -debug -rtsopts -threaded -main-is
 Repro Repro.hs
 ./Repro +RTS -A16m -DS
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13793>
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