[GHC] #9848: List.all does not fuse

[GHC]

#9848: List.all does not fuse
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        Reporter:  klapaucius        |                   Owner:  ekmett
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Core Libraries    |                 Version:  7.9
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Comment (by nomeata):

 > Should I add a performance test?

 Yes. Usually with list fusion you can create a test that allocates almost
 nothing if fusion kicks in, but allocates a lot of it does not.

 Alternatively, you can copy the code from
 http://hackage.haskell.org/package/list-fusion-probe-0.1.0.3/docs/src
 /Data-List-Fusion-Probe.html into the test case and wrap the argument to
 `all` with `fuseThis`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9848#comment:5>
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