scala: abstract classes instantiation?

Question

How it comes that I instantiate an abstract class?

  abstract class A {
    val a: Int
  }

  val a = new A {val a = 3}

Or is some concrete cla

Answer 1

you're instantiating an anonymous class that inherits from A and overloads its abstract a member. For reference, see the part about anonymous class instantiations in A Tour of Scala: Abstract Types