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/// 对给定的数字加1
/// # 范例
/// ```
/// let five = 5;
///
/// assert_eq!(6, my_crate::add_one(5));
/// ```
pub fn add_one(x: i32) -> i32 {
    x + 1
}

#[cfg(test)]
mod tests {
    use super::add_one;
    #[test]
    fn it_works() {
        assert_eq!(3, add_one(2));
    }
}