rust学习: 有用的命令

在学习rust的过程中, 发现一些有用的命令, 记录之.

cargo subcommands

cargo-expand

可以将rust中的宏展开.
代码仓库: https://github.com/dtolnay/cargo-expand

例子:
cargo new demo
修改main.rs内容如下:

#[derive(Debug)]
struct User {
    name: String,
    age: u8,
}

fn main() {
    let u = User{
        name: String::from("John"),
        age: 30,
    };
    println!("{:?}", u);
}

运行cargo expand, 效果:

#![feature(prelude_import)]
#[prelude_import]
use std::prelude::rust_2021::*;
#[macro_use]
extern crate std;
struct User {
    name: String,
    age: u8,
}
#[automatically_derived]
impl ::core::fmt::Debug for User {
    #[inline]
    fn fmt(&self, f: &mut ::core::fmt::Formatter) -> ::core::fmt::Result {
        ::core::fmt::Formatter::debug_struct_field2_finish(
            f,
            "User",
            "name",
            &self.name,
            "age",
            &&self.age,
        )
    }
}
fn main() {
    let u = User {
        name: String::from("John"),
        age: 30,
    };
    {
        ::std::io::_print(format_args!("{0:?}\n", u));
    };
}

这样方便我们了解宏展开的效果.

其他

tokei

(持续更新)