public fun foo(x: String?): Int {
    while (true) {
        // After the check, smart cast should work
        val y = if (x == null) break else <!DEBUG_INFO_SMARTCAST!>x<!>
        // y is not null in both branches
        y.length
    }
    // x is null because of the break
    return x<!UNSAFE_CALL!>.<!>length
}