Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/1463#issuecomment-50586830
In your example, the reason why there is no annotation on the `A` class is
that it the class is distinct from the companion object. You only created the
companion object in your example. I think that in this case scala will create
an empty class. What happens if you compile this:
```
@SomeAnnotation
object A
@SomeAnnotation
class A
```
Will you see the annotation on both?
I this current approach will cause false negatives in the following
situation:
```
// This is not a developer API
class A
// This is a developer API
@DeveloperAPI
object A
```
In this case changes to the `A` class would be ignored, incorrectly.
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