[GHC] #10168: generalize filterM, mapAndUnzipM, zipWithM, zipWithM_, replicateM, replicateM_

[GHC]

#10168: generalize filterM, mapAndUnzipM, zipWithM, zipWithM_, replicateM,
replicateM_
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        Reporter:  strake888         |                Owner:
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:  8.0.1
       Component:  Core Libraries    |              Version:  7.10.1-rc1
      Resolution:  fixed             |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D1324
       Wiki Page:                    |
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Comment (by dfeuer):

 I was too tired when I wrote that remark, so I forgot about transformers.
 `StateT u (ST s)` actually is a perfectly beautiful target for
 `replicateM_`. With the current definition, that *can* be unboxed,
 allowing for some serious vector crunching. I think your version should be
 in the library; I just think it should have a new name.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10168#comment:22>
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