[GHC] #5916: runST isn't free

[GHC]

#5916: runST isn't free
-------------------------------------+-------------------------------------
        Reporter:  tibbe             |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:  7.12.1
       Component:  Compiler          |                 Version:  7.4.1
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Runtime           |               Test Case:
  performance bug                    |  simplCore/should_run/runST
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
-------------------------------------+-------------------------------------
Changes (by rwbarton):

 * testcase:   => simplCore/should_run/runST


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/5916#comment:23>
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