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by mrkgnao
3039 days ago
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This is a nifty thing made possible by the MonadFail class, which defines how a monad treats or recovers from a failed pattern-match. When a value is bound in do-notation, the pattern on the
left hand side of <- might not match. In this case, this
class provides a function to recover.
https://hackage.haskell.org/package/base-4.10.1.0/docs/Contr... |
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