When it fits on one line, I also like the style:

```dart
foo() => bar + baz ^ f
```

or

```dart
foo() => bar + baz 
       ^ f
```

I like it better because a + b + c reads like a sequence (left to right) which it is.

I'm just thinking of it now, so I'm using the occasion to tell you, but for consistency with the rest of the file feel free not to change it.