[GHC] #8834: 64-bit windows cabal.exe segfaults in GC

[GHC]

#8834: 64-bit windows cabal.exe segfaults in GC
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        Reporter:  awson          |            Owner:
            Type:  bug            |           Status:  patch
        Priority:  highest        |        Milestone:  7.8.1
       Component:  Compiler       |          Version:  7.8.1-rc2
      Resolution:                 |         Keywords:
Operating System:  Windows        |     Architecture:  x86_64 (amd64)
 Type of failure:  Runtime crash  |       Difficulty:  Unknown
       Test Case:                 |       Blocked By:
        Blocking:                 |  Related Tickets:
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Comment (by awson):

 Replying to [comment:17 simonmar]:
 > I'm surprised that the change to `isTrivial` all by itself causes this
 failure.  That must mean that there was something wrong with the code
 before the "bad patch", because the change to `isTrivial` should be safe.

 It probably would worth to add that reverting `isTrivial` only does not
 help either. I. e. `isTrivial` all by itself broke things as they were
 before that bad commit, but changing *only* `isTrivial` to it's pre-commit
 state does not help either.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8834#comment:19>
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