gistfile1.txt

class Foo(_name: String) {
  def name = _name
  def equals(other: Foo) = {
        println(this, other, name, other.name, name equals other.name)
        _name equals other.name
  }
}

val (one,two,three) = (new Foo("one"), new Foo("two"), new Foo("three"))
val s = Seq[Foo](one, two, three)

println(s contains one)
println(s contains new Foo("one"))
println(new Foo("one") == one)
println(new Foo("one") equals one)

// expected output: true true true true; actual output: true false false true; Foo.equals is called once

// EXTRA BONUS CODE: shows that == is not calling equals
class Bar {
  def equals(x: Bar) = { println("bar equals bar"); true }
}

val b = new Bar
println(new Bar == new Bar)
println(new Bar equals new Bar)

// expected output: true true; actual output: false true; Bar.equals is called once