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Commit 3ee0c143 authored by quchen's avatar quchen Committed by Ben Gamari
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Improve MonadFail errors by mentioning the pattern 

Example error message:

    MonadFailErrors.hs:16:5: error:
        Could not deduce (MonadFail m)
          arising from a do statement
                       with the failable pattern ‘Just x’

Depends on D1248

Reviewers: austin, bgamari

Subscribers: thomie

Differential Revision: https://phabricator.haskell.org/D1489
parent 112ce874
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