[GHC] #5302: Unused arguments in join points

[GHC]

#5302: Unused arguments in join points
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        Reporter:  reinerp           |                Owner:  simonpj
            Type:  bug               |               Status:  new
        Priority:  low               |            Milestone:  8.4.1
       Component:  Compiler          |              Version:  7.0.3
      Resolution:                    |             Keywords:  JoinPoints
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 > The second argument is still boxed

 Even with -O2 (which does a second demand/absence analysis pass?  I think,
 though I have not dug into it, that the absence may only show up late.

 Even if that's true, we should just check to ensure that there's no way it
 could have been caught in the first pass.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/5302#comment:14>
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