Scala symbols declared in package object end up in wrong scope

[stuhood]

When a package object is declared:

package akka.http.scaladsl

package object marshalling {
  type ToEntityMarshaller[T] = ...
}

... akka.http.scaladsl.ToEntityMarshaller is extracted as the declared symbol, which is missing the additional marshalling nesting.

[stuhood]

This represented roughly 5% of the issues in akka-http.