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% Comments
<small>There is a new edition of the book and this is an old link.</small>
> Comments must start with two slashes and continue until the end of the line.
> For comments that extend beyond a single line, you’ll need to include // on each line.
```rust
// So we’re doing something complicated here, long enough that we need
// multiple lines of comments to do it! Whew! Hopefully, this comment will
// explain what’s going on.
```
---
Here are the relevant sections in the new and old books:
* **[in the current edition: Ch 3.04 — Comments][2]**
* <small>[In the first edition: Ch 3.4 — Comments][1]</small>
[1]: https://doc.rust-lang.org/1.30.0/book/first-edition/comments.html
[2]: ch03-04-comments.html
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