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Introduce a warning, -Wmissing-home-modules, to warn about home modules, not listed in command line. It is usefull for cabal when user fails to list a module in `exposed-modules` and `other-modules`. Test Plan: make TEST=MissingMod Reviewers: mpickering, austin, bgamari Reviewed By: bgamari Subscribers: simonpj, mpickering, thomie Differential Revision: https://phabricator.haskell.org/D2977 GHC Trac Issues: #13129
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