Hi

I suggest new methods for Ord working like below:

```
trait Ord {
fn chmax(&mut self, other: Self) -> bool { ... }
fn chmin(&mut self, other: Self) -> bool { ... }
}
```

```
x.chmax(y);
// x = x.max(y);
x.chmin(y);
// x = x.min(y);
```

The method `chmax`

replaces `self`

and returns `true`

if `self < other`

, else returns `false`

The method `chmin`

works in same way

Also I suggest adding these methods for `Option<T> where T: Ord`

```
impl<T> Option<T> {
fn chmin(&mut self, other: T) where T: Ord { ... }
fn chmin(&mut self, other: T) where T: Ord { ... }
}
```