incredibles.scala

scala> case class Person(name: String, age: Int)
defined class Person

scala> val p1 = Person("Steve", 39)
p1: Person = Person(Steve,39)

scala> val p2 = Person("Steve", 39)
p2: Person = Person(Steve,39)

scala> p1 == p2
res0: Boolean = true

scala> p1 === p2
<console>:10: error: value === is not a member of Person
       p1 === p2
       ^

scala> p1 eq p2 
res2: Boolean = false

scala> p1
res3: Person = Person(Steve,39)

scala> p1.toString
res4: String = Person(Steve,39)

scala> p2.toString
res5: String = Person(Steve,39)

scala> scala.collection.Set(p1, p2)
res6: scala.collection.Set[Person] = Set(Person(Steve,39))