[GHC] #10841: Run handler on STM retry

[GHC]

#10841: Run handler on STM retry
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        Reporter:  shlevy            |                   Owner:
            Type:  feature request   |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  libraries         |                 Version:  7.10.2
  (other)                            |
      Resolution:                    |                Keywords:  stm
Operating System:  Unknown/Multiple  |            Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Comment (by shlevy):

 A few more thoughts looking back on this a few days later: a) It might be
 nice to have some structured information from the runtime explaining why a
 transaction needed to retry, and b) perhaps the only primitive needed is
 just a "try once" that can be looped as-desired by the user.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10841#comment:3>
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