// ISSUE: KT-49249
// WITH_STDLIB

fun test_1() {
    val a: Throwable? = null;
    val b: Unit? = null
    val c = a ?: b?.let { return it } ?: return
    c<!UNNECESSARY_NOT_NULL_ASSERTION!>!!<!>
    throw a
}

fun test_2() {
    val a: Throwable? = null;
    val b: Unit? = null
    val c = a ?: b?.let { return it } ?: return
    throw a
}

fun test_3() {
    val a: Throwable? = null;
    val b: Unit? = null
    val c = b?.let { return it } ?: a ?: return
    c<!UNNECESSARY_NOT_NULL_ASSERTION!>!!<!>
    throw a
}

fun test_4() {
    val a: Throwable? = null;
    val b: Unit? = null
    val c = b?.let { return it } ?: a ?: return
    throw a
}