interface Base {
    fun foo()
}

var ~setter1~Int.setter1: Int = 2
    set(i: Int) {
        field = `setter1`this@setter1
    }

var ~setter2~Int.setter2: Base? = null
    set(i: Base?) {
        field = object: Base {
            override fun foo() {
                `setter2`this@setter2
            }
        }
    }

var ~setter3~Int.setter3: Int = 1
    set(i: Int) {
        {
            `setter3`this@setter3
        }.invoke()
    }

var ~setter4~Int.setter4: Int = 1
    set(i: Int) {
        val extFun = { Int.() ->
            `setter4`this@setter4
        }
        `setter4`this@setter4.extFun()
    }