将生成的整数转换为C类枚举

Question

是否可以将int转换为生锈的C类枚举？可以从枚举转换为int，但我也想以其他方式进行转换。

enum Type {
    FIRST = 1,
    SECOND = 2,
    THIRD = 3,
}

fn main() {
    let x = 3u8 as Type;
    println!("{}", x as u8);
}

尝试转换为Type时出错：

main.rs:8:13: 8:24 error: non-scalar cast: `u8` as `Type`
main.rs:8     let x = 3u8 as Type;
                      ^~~~~~~~~~~
error: aborting due to previous error