[GHC] #9670: Make Data.List.tails a good producer for list fusion

[GHC]

#9670: Make Data.List.tails a good producer for list fusion
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       Reporter:  dfeuer             |                   Owner:  ekmett
           Type:  task               |                  Status:  new
       Priority:  normal             |               Milestone:  7.10.1
      Component:  Core Libraries     |                 Version:  7.8.3
       Keywords:  fusion             |        Operating System:
   Architecture:  Unknown/Multiple   |  Unknown/Multiple
     Difficulty:  Unknown            |         Type of failure:
     Blocked By:                     |  None/Unknown
Related Tickets:                     |               Test Case:
                                     |                Blocking:
                                     |  Differential Revisions:
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 Its structure is trivially an unfold, so it should work well as a
 producer.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9670>
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