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"extern crate" is no longer necessary in rust 2018 #1590

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4 changes: 1 addition & 3 deletions src/advance/macro.md
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Expand Up @@ -335,7 +335,7 @@ hello_macro_derive = { path = "../hello_macro/hello_macro_derive" }

此时，`hello_macro` 项目就可以成功的引用到 `hello_macro_derive` 本地包了，对于项目依赖引入的详细介绍，可以参见 [Cargo 章节](https://course.rs/cargo/dependency.html)。

另外，学习过程更好的办法是通过展开宏来阅读和调试自己写的宏，这里需要用到一个 cargo-expand 的工具，可以通过下面的命令安装
另外，学习过程宏更好的办法是通过展开宏来阅读和调试自己写的宏，这里需要用到一个 cargo-expand 的工具，可以通过下面的命令安装：
```bash
cargo install cargo-expand
```
Expand All @@ -360,8 +360,6 @@ quote = "1.0"
其次，在 `hello_macro_derive/src/lib.rs` 中添加如下代码：

```rust
extern crate proc_macro;

use proc_macro::TokenStream;
use quote::quote;
use syn;
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