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An effect corresponding to the MonadFail type class.

Effly's MonadFail instance is based on this effect; by having access to Fail, you're able to invoke handle pattern-match failure automatically inside of effect handlers.

Each Fail interpreter's associated carrier has an MonadFail instance based on how it interprets Fail. This means you can use an Fail interpreter to locally gain access to an MonadFail instance inside of application code.