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// how do I define MyTrait make this work?
// I expect C1#foo() to return "C1: [bar]" and C2#foo() to return "C2: [baz]"

trait MyTrait {
  override def foo() = { additionalFoo() + "[" + super.foo() + "]"}
  def additionalFoo(): String
}

class A {
  def foo() = "foo"
}

class B1 extends A {
  override def foo() = "bar"
}

class C1 extends B1 with MyTrait {
  override def additionalFoo() = "C1:"
}

class B2 extends A {
 override def foo() = "baz"
}

class C2 extends B2 with MyTrait {
  override def additionalFoo() = "C2:"
}