Rust 安装

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Rust 安装

Installation - The Rust Programming Language
使用 RustUp 管理 Rust 版本

**Rust is installed now. Great!**
To get started you may need to restart your current shell.
This would reload your **PATH** environment variable to include
Cargo's bin directory ($HOME/.cargo/bin).

linker 是什么?

You will also need a _linker_, which is a program that Rust uses to join its compiled outputs into one file. It is likely you already have one. If you get linker errors, you should install a C compiler, which will typically include a linker. A C compiler is also useful because some common Rust packages depend on C code and will need a C compiler.

hello world!

fn main() { 
    println!("Hello, world!"); 
}

Hello, World! - Rust 程序设计语言简体中文版
Rust 的缩进风格使用 4 个空格，而不是 1 个制表符（tab）。

println! 调用了一个 Rust 宏（macro）。如果是调用函数，则应输入 println（没有 !）。我们将在第十九章详细讨论宏。现在你只需记住，当看到符号 ! 的时候，就意味着调用的是宏而不是普通函数，并且宏并不总是遵循与函数相同的规则