[GHC] #7994: Make foldl into a good consumer

[GHC]

#7994: Make foldl into a good consumer
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        Reporter:  simonpj           |            Owner:
            Type:  bug               |           Status:  closed
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          Version:  7.6.3
      Resolution:  fixed             |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by Joachim Breitner <mail@…>):

 In [changeset:"c271e32eac65ee95ba1aacc72ed1b24b58ef17ad/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="c271e32eac65ee95ba1aacc72ed1b24b58ef17ad"
 Add GHC.Prim.oneShot

 to allow the programer to explictitly set the oneShot flag. This helps
 with #7994 and will be used in left folds. Also see
 https://ghc.haskell.org/trac/ghc/wiki/OneShot

 This commit touches libraries/base/GHC/Event/Manager.hs (which used to
 have a local definition of the name oneShot) to avoid a shadowing error.

 Differential Revision: https://phabricator.haskell.org/D392
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7994#comment:22>
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