trait Init {
  def preInit(event: FMLPreInitializationEvent): Unit
}

trait Blocks extends Init {
  abstract override def preInit(event: FMLPreInitializationEvent): Unit = {
    super.preInit(event)
    println("Blocks")
  }
}

object MeMod extends Init with Blocks {
  override def preInit(event: FMLPreInitializationEvent): Unit = println("PreInit")
}