Simple gist to show problem when using companion object extending trait and sub-class using the same trait

trait-conflictor.scala

object MyApp extends App {
  val b = new B()
}

trait Conflictor {
	val log = "reduction"
}

class A {}

object A extends Conflictor {}

class B extends A with Conflictor {}

This one works :

object MyApp extends App {
  val b = new B()
}

trait Conflictor {
    val log = "reduction"
}

class A extends Conflictor {}

object A extends Conflictor {}

class B extends A with Conflictor {}