[GHC] #9510: Prelude.!! is not a good consumer

[GHC]

#9510: Prelude.!! is not a good consumer
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              Reporter:  dfeuer      |            Owner:
                  Type:  bug         |           Status:  new
              Priority:  normal      |        Milestone:
             Component:              |          Version:  7.8.3
  libraries/base                     |         Keywords:  fusion
            Resolution:              |     Architecture:  Unknown/Multiple
      Operating System:              |       Difficulty:  Unknown
  Unknown/Multiple                   |       Blocked By:
       Type of failure:  Runtime     |  Related Tickets:
  performance bug                    |
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Comment (by dfeuer):

 Note that, like the new `last`-as-`foldl`, this almost certainly won't be
 able to unbox the list elements, for the same reason.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9510#comment:1>
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