class_resilient_add_virtual_method_subclass.swift
#if BEFORE
open class AddVirtualMethod {
public init() {}
open func f1() -> Int {
return 1
}
}
#else
open class AddVirtualMethod {
public init() {}
open func f1() -> Int {
return f2() + 1
}
open func f2() -> Int {
return 0
}
}
#endif