scala> def foo = 5
def foo: Int
scala> def bar: String = "1"
def bar: String
scala> def baz() = 2
def baz(): Int
scala> def qux(): Int = 2
def qux(): Int
scala> def id(x: 4): 4 = x
def id(x: 4.type): Int(4)
scala> id(4)
val res0: Int = 4
scala> :quit