}

        fun buildSubstitutor(substitutor: ConeSubstitutor): KtSubstitutor {
            if (substitutor == ConeSubstitutor.Empty) return KtSubstitutor.Empty(token)
            return when (substitutor) {
                is ConeSubstitutorByMap -> KtFirMapBackedSubstitutor(substitutor, this@KtSymbolByFirBuilder)
                is ChainedSubstitutor -> KtFirChainedSubstitutor(substitutor, this@KtSymbolByFirBuilder)

            !typeProjection.isStarProjection &&
                    typeProjection.type.hasReferenceOtherThan(allowedTypeParameterDescriptors)
        }
    }
}

/**
 * Use-site substitution override are tracked through [CallableDescriptor.getOriginal]. Note that overridden symbols are accessed through
 * [CallableDescriptor.getOverriddenDescriptors] instead, which is separate from [CallableDescriptor.getOriginal].
 */

            // to prevent the following [substituteTypeOr*] from proceeding to its own (recursive) substitution.
            if (type.hasRecursiveTypeArgument()) return type
            // Return `null` means we will use [fir.resolve.substitution.Substitutors]'s [substituteRecursive]
            // that literally substitutes type arguments recursively.
            return null
        }

    }

    override fun getEnhancedType(type: KtType): KtType? {
        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 {

            Errors.TYPE_PARAMETER_AS_REIFIED,
            Errors.DEFINITELY_NON_NULLABLE_AS_REIFIED,
            Errors.REIFIED_TYPE_FORBIDDEN_SUBSTITUTION,
            Errors.REIFIED_TYPE_UNSAFE_SUBSTITUTION,
            Errors.CANDIDATE_CHOSEN_USING_OVERLOAD_RESOLUTION_BY_LAMBDA_ANNOTATION,
            Errors.RESOLUTION_TO_CLASSIFIER,
            Errors.RESERVED_SYNTAX_IN_CALLABLE_REFERENCE_LHS,

        val substitutor = (this as? FirQualifiedAccessExpression)
            ?.createConeSubstitutorFromTypeArguments(rootModuleSession, discardErrorTypes = !substituteWithErrorTypes)
            ?: ConeSubstitutor.Empty

        return resolvedArgumentMapping?.mapValuesTo(LinkedHashMap()) { (_, parameter) ->
            SubstitutedValueParameter(parameter, substitutor.substituteOrSelf(parameter.returnTypeRef.coneType))

/compiler/testData/versionRequirement/ "Kotlin JVM"
/compiler/testData/writeFlags/ "Kotlin JVM"
/compiler/testData/writeSignature/ "Kotlin JVM"
/compiler/testData/type-checker-test.kt "Kotlin Compiler Core"
/compiler/testData/type-substitutor.kt "Kotlin Compiler Core"
/compiler/tests/ "Kotlin Compiler Core" "Kotlin JVM" "Kotlin Native" "Kotlin Wasm" "Kotlin Common Backend"
/compiler/tests/org/jetbrains/kotlin/klib/ "Kotlin Common Backend"