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Issue a separate warning per redundant (or inaccessible) clause. This way each warning can have more precice location information (the location of the clause under consideration and not the whole match). I thought that this could be too much but actually the number of such warnings is bound by the number of cases matched against (in contrast to the non-exhaustive warnings which may be exponentially more). Test Plan: validate Reviewers: simonpj, austin, bgamari Reviewed By: bgamari Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1920 GHC Trac Issues: #8710
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