[GHC] #9546: filterM is not a good consumer for list fusion

[GHC]

#9546: filterM is not a good consumer for list fusion
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       Reporter:  dfeuer             |                   Owner:
           Type:  bug                |                  Status:  new
       Priority:  normal             |               Milestone:
      Component:  Compiler           |                 Version:  7.9
       Keywords:                     |        Operating System:
   Architecture:  Unknown/Multiple   |  Unknown/Multiple
     Difficulty:  Unknown            |         Type of failure:  Runtime
     Blocked By:                     |  performance bug
Related Tickets:                     |               Test Case:
                                     |                Blocking:
                                     |  Differential Revisions:
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 This one shouldn't cause any wonkiness; it just updates `filterM` to fuse
 is much the same way `mapM` does.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9546>
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