require(type is KtFe10Type)
        return typeApproximator.approximateToSuperType(type.fe10Type, PublicApproximatorConfiguration(approximateLocalTypes))
            ?.toKtType(analysisContext)
    }

    override fun approximateToSubPublicDenotableType(type: KtType, approximateLocalTypes: Boolean): KtType? {
        require(type is KtFe10Type)

        require(type is KtFirType)
        val coneType = type.coneType
        val substitutor = EnhancedForWarningConeSubstitutor(typeContext)
        val enhancedConeType = substitutor.substituteType(coneType)

        return enhancedConeType?.asKtType()
    }

    override fun buildSelfClassType(symbol: KtNamedClassOrObjectSymbol): KtType {
        require(symbol is KtFirNamedClassOrObjectSymbol)

        val assignmentRValue = fir.rValue
        if (expression is KtOperationReferenceExpression &&
            assignmentRValue.source?.kind is KtFakeSourceElementKind.DesugaredAugmentedAssign
        ) {
            require(assignmentRValue is FirResolvable) {
                "Rvalue of desugared compound assignment should be resolvable, but it was ${assignmentRValue::class}"
            }

object AnalysisApiFe10TestConfiguratorFactory : AnalysisApiTestConfiguratorFactory() {
    override fun createConfigurator(data: AnalysisApiTestConfiguratorFactoryData): AnalysisApiTestConfigurator {
        require(supportMode(data))

        return when (data.moduleKind) {
            TestModuleKind.Source -> when (data.analysisSessionMode) {
                AnalysisSessionMode.Normal -> AnalysisApiFe10TestConfigurator

    }

    override fun getFileScope(fileSymbol: KtFileSymbol): KtScope {
        require(fileSymbol is KtFe10FileSymbol)
        return KtFe10FileScope(fileSymbol.psi, analysisContext, token)
    }

    override fun getPackageScope(packageSymbol: KtPackageSymbol): KtScope {
        require(packageSymbol is KtFe10PackageSymbol)

    }
}

private class KtFirResolveExtensionScope(
    private val analysisSession: KtFirAnalysisSession,
    private val tools: List<LLFirResolveExtensionTool>,
) : KtScope {
    init {
        require(tools.isNotEmpty())
    }

    override val token: KtLifetimeToken get() = analysisSession.token

    override fun getCallableSymbols(nameFilter: KtScopeNameFilter): Sequence<KtCallableSymbol> = withValidityAssertion {

        candidateSymbol: KtSymbolWithVisibility,
        useSiteFile: KtFileSymbol,
        position: PsiElement,
        receiverExpression: KtExpression?
    ): Boolean {
        require(candidateSymbol is KtFirSymbol<*>)
        require(useSiteFile is KtFirFileSymbol)

        if (candidateSymbol is KtFirPsiJavaClassSymbol) {
            candidateSymbol.isVisibleByPsi(useSiteFile)?.let { return it }
        }

                // Stubbed top-level function IR symbols (from other source files in the module) require a parent facade class to be
                // generated, which requires a container source to be provided. Without a facade class, function IR symbols will have
                // an `IrExternalPackageFragment` parent, which trips up code generation during IR lowering.

        firExplicitReceiver = explicitReceiver?.let(::findReceiverFirExpression)
    }

    override fun computeApplicability(candidate: KtCallableSymbol): KtExtensionApplicabilityResult {
        require(candidate is KtFirSymbol<*>)

        analysisSession.withValidityAssertion {
            val firSymbol = candidate.firSymbol as FirCallableSymbol<*>
            firSymbol.lazyResolveToPhase(FirResolvePhase.STATUS)

                    // Stubbed top-level function IR symbols (from other source files in the module) require a parent facade class to be
                    // generated, which requires a container source to be provided. Without a facade class, function IR symbols will have