[GHC] #8680: In STM: Variables only in left branch of orElse can invalidate the right branch transaction

[GHC]

#8680: In STM: Variables only in left branch of orElse can invalidate the right
branch transaction
--------------------------------------------+------------------------------
        Reporter:  jberryman                |            Owner:
            Type:  bug                      |           Status:  new
        Priority:  normal                   |        Milestone:
       Component:  Compiler                 |          Version:  7.6.3
      Resolution:                           |         Keywords:
Operating System:  Unknown/Multiple         |     Architecture:
 Type of failure:  Runtime performance bug  |  Unknown/Multiple
       Test Case:                           |       Difficulty:  Unknown
        Blocking:                           |       Blocked By:
                                            |  Related Tickets:
--------------------------------------------+------------------------------

Comment (by carter):

 any chance you could cook up an even smaller example that exhibits the
 problem? :)

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8680#comment:1>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler