else -> error("Unexpected ${this::class}")
        }

    /**
     * Note: The resulting sequence does not contain non-qualified types!
     *
     * For type `A.B.C.D` it will return sequence of [`A.B.C.D`, `A.B.C`, `A.B`] (**without** `A`).
     */
    private val KtUserType.qualifiedTypesWithSelf: Sequence<KtUserType>
        get() {
            require(qualifier != null) {