0 -> KtSubstitutor.Empty(token)
            else -> {
                val chained = substitutors.reduce { left, right -> left.chain(right) }
                firSymbolBuilder.typeBuilder.buildSubstitutor(chained)
            }
        }
    }


    private fun collectInheritancePath(
        baseSymbol: FirClassSymbol<*>,
        superSymbol: FirClassSymbol<*>,

internal class KtFirSubstitutorFactory(
    override val analysisSession: KtFirAnalysisSession
) : KtSubstitutorFactory(), KtFirAnalysisSessionComponent {

    override fun buildSubstitutor(builder: KtSubstitutorBuilder): KtSubstitutor {
        if (builder.mappings.isEmpty()) return KtSubstitutor.Empty(token)

        val firSubstitution = buildMap {

internal class KtFe10SubstitutorFactory(
    override val analysisSession: KtFe10AnalysisSession
) : KtSubstitutorFactory(), Fe10KtAnalysisSessionComponent {

    override fun buildSubstitutor(builder: KtSubstitutorBuilder): KtSubstitutor {
        if (builder.mappings.isEmpty()) return KtSubstitutor.Empty(token)
        TODO()
    }

    }

    fun ConeSubstitutor.toKtSubstitutor(): KtSubstitutor {
        return analysisSession.firSymbolBuilder.typeBuilder.buildSubstitutor(this)
    }

            ProjectionKind.INVARIANT -> Variance.INVARIANT
            ProjectionKind.STAR -> error("KtStarProjectionTypeArgument should not be directly created")
        }

        fun buildSubstitutor(substitutor: ConeSubstitutor): KtSubstitutor {
            if (substitutor == ConeSubstitutor.Empty) return KtSubstitutor.Empty(token)
            return when (substitutor) {

        val coneSubstitutor = substitutorByMap(mapOf(typeParameter.symbol to elementType), rootModuleSession)
        return firSymbolBuilder.typeBuilder.buildSubstitutor(coneSubstitutor)
    }


    private fun FirEqualityOperatorCall.toKtCallInfo(psi: KtElement): KtCallInfo? {