Throw expressions are annoying to use on the right of if-null expressions

I know that this is rather fussy, but I stumble across this so often that I'm wondering if there's something that could be done about this in the language.

I'd like to write
```dart
var x = y ?? throw SomeError();
```
I have to write
```dart
var x = y ?? (throw SomeError());
```

This is a very common pattern to deal with nullable values and I'm not sure why `throw` has such a low precedence. Something like `var x = y != null ? y : throw SomeError()` is not a syntax error either.