可以使用切片模式在不克隆的情况下解析命令行参数吗？

Question

slice pattern in Rust 可以用来解析命令行参数吗？

我将参数捕获为：let args: Vec<String> = std::env::args().skip(1).collect();

我在想这样的事情，但无法编译：

// example usage: progname run bash ls -la
match args {
    ["run", rest_of_commands[..]] => println!("{:?}", rest_of_commands),
    _ => println!("usage: run <your-command>"),
}

Answer 1

从 1.40 开始，“其余”没有稳定的语法。然而 nightly 中有这样的语法：

#![feature(slice_patterns)]

fn main() {
    let args = ["foo", "bar"];
    match args {
        ["run", rest_of_commands @ ..] => println!("{:?}", rest_of_commands),
        _ => println!("usage: run <your-command>"),
    }
}

(Permalink to the playground)

语法identifier @ .. 表示“其余部分”is not finalized yet, and might changed in the future。