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这是我的代码的前三行:

let day_of_week (year: int) (month: int) (day: int): int =
    if year < 2010 || year > 2019 then failwith "year out of range"
    if month < 1 || month > 12 then failwith "invalid month"

对于第二个 if,我得到“意外的令牌”;错误:语法错误“。怎么来的?

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于 2013-07-15T00:07:06.460 回答