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Guide: Derive Eq to avoid compile error. #16003

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Guide: Derive Eq to avoid compile error. #16003

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4 changes: 4 additions & 0 deletions src/doc/guide.md
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Expand Up @@ -1066,13 +1066,17 @@ feature of Rust, and are used throughout the standard library. Enums look
like this:

```
#[deriving(Eq, PartialEq)]
enum Ordering {
Less,
Equal,
Greater,
}
```

We will talk about `#[deriving(Eq, PartialEq)]` later, for now we can read
it as "allow us to use `==` for comparisons."

This is an enum that is provided by the Rust standard library. An `Ordering`
can only be _one_ of `Less`, `Equal`, or `Greater` at any given time. Here's
an example:
Expand Down