[GHC] #10222: Data.Foldable should have genericLength

[GHC]

#10222: Data.Foldable should have genericLength
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              Reporter:  uznx        |             Owner:
                  Type:  feature     |            Status:  new
  request                            |         Milestone:
              Priority:  normal      |           Version:  7.10.1
             Component:              |  Operating System:  Unknown/Multiple
  libraries/base                     |   Type of failure:  None/Unknown
              Keywords:              |        Blocked By:
          Architecture:              |   Related Tickets:
  Unknown/Multiple                   |
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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 The "length" function in Data.Foldable has its return type hardcoded to
 "Int".  There should also be a genericLength function which can return any
 Num type, similar to Data.List.genericLength.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10222>
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