override val first
        get(): KaSubstitutor {
            return builder.typeBuilder.buildSubstitutor(substitutor.first)
        }

    override val second
        get(): KaSubstitutor {
            return builder.typeBuilder.buildSubstitutor(substitutor.second)
        }

private fun List<FirTypeRef>.mapToKtType(
    builder: KaSymbolByFirBuilder,
): List<KaType> = map { typeRef ->
    builder.typeBuilder.buildKtType(typeRef)
}

internal fun FirCallableSymbol<*>.returnType(builder: KaSymbolByFirBuilder): KaType =
    builder.typeBuilder.buildKtType(resolvedReturnType)

internal fun FirCallableSymbol<*>.receiver(builder: KaSymbolByFirBuilder): KaReceiverParameterSymbol? =

    override val token: KaLifetimeToken get() = builder.token

    override val lowerBound: KaType get() = withValidityAssertion { builder.typeBuilder.buildKtType(coneType.lowerBound) }
    override val upperBound: KaType get() = withValidityAssertion { builder.typeBuilder.buildKtType(coneType.upperBound) }
    override val annotations: KaAnnotationList by cached {
        KaFirAnnotationListForType.create(coneType, builder)
    }

    override val returnType by cached {
        val returnType = firSymbol.resolvedReturnType
        if (firSymbol.isVararg) {
            builder.typeBuilder.buildKtType(returnType.varargElementType())
        } else {
            builder.typeBuilder.buildKtType(returnType)
        }
    }

    override val hasDefaultValue: Boolean get() = withValidityAssertion { firSymbol.hasDefaultValue }

    val firSymbolBuilder get() = analysisSession.firSymbolBuilder
    val firResolveSession get() = analysisSession.firResolveSession

    fun ConeKotlinType.asKtType() = analysisSession.firSymbolBuilder.typeBuilder.buildKtType(this)

    fun KtPsiDiagnostic.asKtDiagnostic(): KaDiagnosticWithPsi<*> =
        KT_DIAGNOSTIC_CONVERTER.convert(analysisSession, this as KtDiagnostic)

    fun ConeDiagnostic.asKtDiagnostic(

                KaClassTypeQualifier.KaResolvedClassTypeQualifier(
                    builder.classifierBuilder.buildClassifierSymbol(classSymbolToRender),
                    coneType.typeArguments.map { builder.typeBuilder.buildTypeProjection(it) },
                    builder.token
                )
            )
        }

        val designation = classSymbolToRender.fir.let {

}

private fun createContextReceiver(
    builder: KaSymbolByFirBuilder,
    contextReceiver: FirContextReceiver
) = KaContextReceiverImpl(
    builder.typeBuilder.buildKtType(contextReceiver.typeRef),
    contextReceiver.customLabelName,
    builder.token
)

internal fun FirCallableSymbol<*>.getCallableId(): CallableId? {
    return when {

        firSymbolBuilder.typeBuilder.buildKtType(coneSubstitutor.substituteOrSelf(coneType))
    }
    override val receiverType: KaType? by cached {
        firSymbol.resolvedReceiverTypeRef?.let { typeRef ->
            firSymbolBuilder.typeBuilder.buildKtType(coneSubstitutor.substituteOrSelf(typeRef.coneType))
        }
    }

    @Suppress("UNCHECKED_CAST")
    override val symbol: S
        get() = withValidityAssertion { firSymbol.buildSymbol(firSymbolBuilder) as S }
    override val returnType: KaType by cached {
        firSymbolBuilder.typeBuilder.buildKtType(coneSubstitutor.substituteOrSelf(firSymbol.resolvedReturnType))
    }
    override val receiverType: KaType? by cached {
        val receiverTypeRef = when (val fir = firSymbol.fir) {

    @OptIn(UnexpandedTypeCheck::class)
    override val upperBounds: List<KaType> by cached {
        firSymbol.resolvedBounds.mapNotNull { type ->
            if (type.isNullableAny) return@mapNotNull null
            builder.typeBuilder.buildKtType(type)
        }
    }

    override fun createPointer(): KaSymbolPointer<KaTypeParameterSymbol> = withValidityAssertion {