configureLambdas: ConfigureLambdaHandler
    ): SchemaMemberFunction {
        val thisTypeRef = inType.toDataTypeRef()

        val returnType = function.returnType

        checkInScope(returnType, preIndex)
        val returnClass = function.returnType.classifier as KClass<*>
        val fnParams = function.parameters

        is KClass<*> -> DataTypeRefInternal.DefaultName(DefaultFqName.parse(checkNotNull(qualifiedName)))
        else -> error("unexpected type")
    }


internal
fun checkInScope(
    type: KType,
    typeScope: DataSchemaBuilder.PreIndex
) {
    if (type.classifier?.isInScope(typeScope) != true) {
        error("type $type used in a function is not in schema scope")
    }
}