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Since the order of required and provided constraint contexts of pattern synonyms has been switched recently, I updated a couple places in the users guide's pattern synonym section to accommodate for this. Test Plan: read it :-) Reviewers: goldfire, thomie, mpickering, simonpj, austin, bgamari Reviewed By: bgamari Differential Revision: https://phabricator.haskell.org/D2034
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