kotlin-fork/compiler/testData/diagnostics/tests/smartCasts/smartCastOnWhen.fir.kt

// Smart casts on complex expressions
fun baz(s: String?): Int {
    if (s == null) return 0
    return when(s) {
        "abc" -> s
        else -> "xyz"
    }.length
}

var ss: String? = null

fun bar(): Int {
    if (ss == null) return 0
    // ss cannot be smart casted, so an error here
    return when(ss) {
        "abc" -> ss
        else -> "xyz"
    }<!UNSAFE_CALL!>.<!>length
}