Rust 编写的 Borgo 语言带来了代数数据类型和更多功能

use fmtenum NetworkState<T> {    Loading,    Failed(int),    Success(T),}struct Response {    title: string,    duration: int,}fn main() {    let res = Response {        title: "Hello world",        duration: 0,    }    let state = NetworkState.Success(res)    let msg = match state {        NetworkState.Loading => "still loading",        NetworkState.Failed(code) => fmt.Sprintf("Got error code: %d", code),        NetworkState.Success(res) => res.title,    }    fmt.Println(msg)}

use bufiouse fmtuse math.randuse osuse strconvuse stringsuse timefn main() {    let reader = bufio.NewReader(os.Stdin)    let secret = rand.Intn(100) + 1    loop {        fmt.Println("Please input your guess.")        let text = reader.ReadString('\n').Unwrap()        let text = strings.TrimSpace(text)        let guess = match strconv.Atoi(text) {            Ok(n) => n,            Err(_) => continue,        }        fmt.Println("You guessed: ", guess)        if guess < secret {            fmt.Println("Too small!")        } else if guess > secret {            fmt.Println("Too big!")        } else {            fmt.Println("Correct!")            break        }    }}

use fmtuse iouse osfn copyFile(src: string, dst: string) -> Result<(), error> {    let stat = os.Stat(src)?    if !stat.Mode().IsRegular() {        return Err(fmt.Errorf("%s is not a regular file", src))    }    let source = os.Open(src)?    defer source.Close()    let destination = os.Create(dst)?    defer destination.Close()    // 忽略复制的字节数    let _ = io.Copy(destination, source)?    Ok(())}

$ cargo run -- build

# 如果需要，生成一个 go.mod 文件# $ go mod init foo$ go run .