class A {
    ~A.foo~fun foo() = 1
}
class B {
}
~B.foo~fun B.foo() = 2

fun test(a: A, b: B) {
    with (a) {
        with (b) {
            `B.foo`foo()
        }
    }
}

fun <T, R> with(receiver: T, f: T.() -> R) : R = receiver.f()