File: t0631.scala

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scala 2.11.12-4
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object Test extends App {
  class Foo {
    override def equals(that: Any) = {
      println("Foo.equals called")
      super.equals(that)
    }
  }

  println(new Foo == new Foo)

  case class Bar(x: Foo)
  val b = new Bar(new Foo)

  // this should not call Foo.equals, but simply compare object identity of b
  println(b == b)
}