@swift-main
class C1 { func f(_ aa: Int) { print(1) } func f(_ aa: Int, _ bb: Int) { print(2) } } class C2: C1 { override func f(_ aa: Int, _ bb: Int = 0) { print(3) } } let c2: C2 = C2() c2.f(42) let c1: C1 = c2 c1.f(42)