When to use the equals sign in a Scala method declaration?

Question

With equals sign:

object HelloWorld {
  def main(args: Array[String]) = {
    println(\"Hello!\")
  }
}

Without equals sign:

Answer 1

One thing : imagine the last statement of a method that should return Unit does not return Unit. Using the non-equal syntax is then very convenient, I hope this will not be deprecated as I see several use case for it