[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:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
-------------------------------------+-------------------------------------

Comment (by simonpj):

 See also #10678

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/5916#comment:22>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler