// PARAM_TYPES: A
// PARAM_TYPES: B
// PARAM_DESCRIPTOR: internal final class A defined in root package
// PARAM_DESCRIPTOR: internal final fun B.foo(): Int defined in A
// SIBLING:
class A {
    val a = 1

    fun B.foo() = i(this@A, this)
}

private fun i(a1: A, b1: B) = a1.a + b1.b

class B {
    val b = 1
}