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Many industrial users have aligned around the idea that implicit exports are an anti-pattern. They lead to namespace pollution and byzantine naming schemes. They also prevent GHC's dead code analysis and create more obstacles to optimization. This warning allows teams/projects to warn on or enforce via -Werror explicit export lists. This warning also serves as a complement to warn-missing-import-lists. This was originally discussed here: https://github.com/ghc-proposals/ghc-proposals/pull/93 Test Plan: Three new minimal tests have been added to the type checker. Reviewers: bgamari Reviewed By: bgamari Subscribers: rwbarton, thomie Differential Revision: https://phabricator.haskell.org/D4197
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