wholeTypeFir: FirResolvedTypeRef
    ): ClassId? {
        val qualifierToResolve = qualifier.parent as KtUserType
        // FIXME make it work with generics in functional types (like () -> AA.BB<CC, AA.DD>)
        val wholeType = when (val psi = wholeTypeFir.psi) {
            is KtUserType -> psi
            is KtTypeReference -> psi.typeElement?.unwrapNullability() as? KtUserType
            else -> null