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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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