[GHC] #13330: forkIO has inconsistent behavior under optimization

[GHC]

#13330: forkIO has inconsistent behavior under optimization
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        Reporter:  dfeuer            |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Core Libraries    |              Version:  8.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Other             |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D3189
       Wiki Page:                    |
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Comment (by simonpj):

 Demand signatures are not expressive enough to express the either/or
 demand you want in comment:14.  Sorry.  Not even close.

 My questions in comment:13 stand though.  What goes wrong (in behavior or
 perf) if we just say `catchException = catch`?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13330#comment:15>
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