}

        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? {
            return mapping[fir]?.getOrNull()
        }

        override fun visitElement(element: FirElement) {

    override fun calculateMetadata(ktClass: KtClassOrObject, mapping: Multimap<KtElement, PsiElement>): Metadata {
        val firClass = ktClass.getOrBuildFirOfType<FirRegularClass>(firResolveSession)
        val bindings = JvmSerializationBindings().also { collectBindings(firClass.declarations, mapping, it) }
        val (serializer, stringTable) = createTopLevelSerializer(bindings)

            if (fir != null) {
                collectedMappings.putIfAbsent(fir, declaration)
            }
        }
    }
}

private class IrDeclarationPatchingVisitor(private val mapping: Map<FirDeclaration, IrDeclaration>) : IrElementVisitorVoid {
    override fun visitElement(element: IrElement) {
        element.acceptChildrenVoid(this)
    }