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

[GHC]

#13330: forkIO has inconsistent behavior under optimization
-------------------------------------+-------------------------------------
        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):
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by rwbarton):

 To be specific, the expected behavior of the test is for the `undefined`
 exception to be reported and then for the program to run for a second and
 then exit.

 This is the behavior without optimizations, and also the behavior under
 GHC 7.10 and earlier regardless of optimization level. Basically, the same
 situation as with `catch` in #11555.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13330#comment:1>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler