get() = withValidityAssertion { descriptor.isExtension }

    override val valueParameters: List<KtValueParameterSymbol>
        get() = withValidityAssertion { descriptor.valueParameters.map { KtFe10DescValueParameterSymbol(it, analysisContext) } }

    override val hasStableParameterNames: Boolean
        get() = withValidityAssertion { descriptor.ktHasStableParameterNames }

    override val returnType: KtType