From a style perspective, I'd prefer the trait definition to be on a single line. There are no other multi-line definitions in this project, and there are definitely longer lines (in this file even) than the ones created by squashing lines 109-110 and 118-119. So I suggest:

```scala
trait ScalaAnnotatedBindingBuilder[T] extends ScalaLinkedBindingBuilder[T] with AnnotatedBindingBuilderProxy[T] {
  outer =>
  
  def annotatedWith[...
```