KtFakeSourceElementKind.SingleExpressionBlock
            )
        }

        private val statements = statements.toHashSet()

        private val mapping = HashMap<FirElement, Optional<FirElement>>()
        private var unmappedCount = statements.size

        private val stack = ArrayDeque<FirElement>()

        operator fun get(fir: FirElement): FirElement? {

            ideCodegenSettings = ideCodegenSettings,
        )
    }
}

private class IrDeclarationMappingCollectingVisitor : IrElementVisitorVoid {
    private val collectedMappings = HashMap<FirDeclaration, IrDeclaration>()

    val mappings: Map<FirDeclaration, IrDeclaration>
        get() = Collections.unmodifiableMap(collectedMappings)

    override fun visitElement(element: IrElement) {