[GHC] #12096: Attach stacktrace information to SomeException

[GHC]

#12096: Attach stacktrace information to SomeException
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        Reporter:  ndtimofeev        |                Owner:  (none)
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Core Libraries    |              Version:  8.0.1
      Resolution:                    |             Keywords:  Exceptions
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by gridaphobe):

 Actually that's not so bad, it's the same trick we use for
 `GHC.Stack.withFrozenCallStack`.

 And this should also give us locations for the rethrows, which sounds like
 a nice touch to me (e.g. maybe you were expecting the exception to be
 caught and need to figure out why it was rethrown).

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12096#comment:19>
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