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와, 이번 장에서는 ExceptT 모나드 트랜스포머를 알려준다! 크리스와 줄리 선생님 필력만 믿습니다. https://hackage-content.haskell.org/package/transformers-0.6.2.0/docs/Control-Monad-Trans-Except.html

Control.Monad.Trans.Except

DescriptionThis monad transformer extends a monad with the ability to throw and catch exceptions.A sequence of actions terminates normally, producing a value, only if none of the actions in the sequence throws an exception. If one throws an exception, the rest of the sequence is skipped and the composite action exits with that exception.If the value of the exception is not required, the variant in Control.Monad.Trans.Maybe may be used instead.

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