[GHC] #8598: IO hack in demand analyzer gets in the way of CPR

[GHC]

#8598: IO hack in demand analyzer gets in the way of CPR
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        Reporter:  nomeata           |            Owner:
            Type:  task              |           Status:  new
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          Version:  7.6.3
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by nomeata):

 >  In short, CPR info yes, guaranteed-divergence no.

 Which is precisely what we obtain from adding `ExitCPR` to the lattice, as
 {{{ExitCPR `lub` BotCPR = ExitCPR}}}.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8598#comment:3>
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