# Eq

The `Eq` macro marks a type's `PartialEq` equality as a total equivalence relation, as Rust's `Eq`
trait does: every value equals itself, so `equals` never treats a value as incomparable. Like
Rust's, it adds no methods and generates no code.

## Requirements

`Eq` requires `PartialEq`, and `Ord` requires `Eq`. Deriving one without what it requires is an
expansion error, as it is a compile error in Rust.

## Example

```typescript
/** @derive(PartialEq, Eq, PartialOrd, Ord) */
class Version {
    major: number;
    minor: number;
}
```

`Eq` contributes nothing to the output; `Version` gets `equals` from `PartialEq`, `partialCompare`
from `PartialOrd` and `compare` from `Ord`.