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Summary: Make scanl a good producer and a good consumer for fold/build fusion. Add strictly-accumulating scanl', which is required for Data.List.inits. Reviewers: nomeata, austin Reviewed By: austin Subscribers: spacekitteh, thomie, carter, ezyang, simonmar Differential Revision: https://phabricator.haskell.org/D314 GHC Trac Issues: #9356
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