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Joachim Breitner authored
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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