[GHC] #9621: New Data.Foldable methods

[GHC]

#9621: New Data.Foldable methods
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              Reporter:  hvr         |            Owner:  ekmett
                  Type:  task        |           Status:  new
              Priority:  normal      |        Milestone:  7.10.1
             Component:  Core        |          Version:
  Libraries                          |         Keywords:
            Resolution:              |     Architecture:  Unknown/Multiple
      Operating System:              |       Difficulty:  Unknown
  Unknown/Multiple                   |       Blocked By:
       Type of failure:              |  Related Tickets:  #9586
  None/Unknown                       |
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Comment (by Herbert Valerio Riedel <hvr@…>):

 In [changeset:"e5cca4ab246ca2d1ecdd7c39eefd3157547cb6aa/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="e5cca4ab246ca2d1ecdd7c39eefd3157547cb6aa"
 Extend `Foldable` class with `length` and `null` methods

 This completes the `Foldable` class by two important operations which
 this way can be optimised for the underlying structure more easily.

 A minor fix for the `containers` submodule was needed to due name clash

 Addresses #9621

 Reviewed By: ekmett, dfeuer, austin

 Differential Revision: https://phabricator.haskell.org/D250
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9621#comment:3>
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