kotlin-fork/compiler/testData/diagnostics/tests/sealed/WhenOnEmptySealed.fir.kt

// !DIAGNOSTICS: -UNUSED_EXPRESSION
sealed class Sealed {

}

fun foo(s: Sealed): Int {
    return <!NO_ELSE_IN_WHEN!>when<!>(s) {
        // We do not return anything, so else branch must be here
    }
}