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quchen authored
This implements phase 1 of the MonadFail proposal (MFP, #10751). - MonadFail warnings are all issued as desired, tunable with two new flags - GHC was *not* made warning-free with `-fwarn-missing-monadfail-warnings` (but it's disabled by default right now) Credits/thanks to - Franz Thoma, whose help was crucial to implementing this - My employer TNG Technology Consulting GmbH for partially funding us for this work Reviewers: goldfire, austin, #core_libraries_committee, hvr, bgamari, fmthoma Reviewed By: hvr, bgamari, fmthoma Subscribers: thomie Projects: #ghc Differential Revision: https://phabricator.haskell.org/D1248 GHC Trac Issues: #10751
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