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Herbert Valerio Riedel authored
The original implementation for #11429 covers only `-W*` flags. However, old packages will continue to use `-f(no-)warn-*` flags, so it seems desirable to have `-Wunrecognised-warning-flag` apply to those legacy aliases as well. Reviewed By: bgamari Differential Revision: https://phabricator.haskell.org/D1942
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