when (this) {
        is SyntheticJavaPropertyDescriptor -> return KtSymbolOrigin.JAVA_SYNTHETIC_PROPERTY
        is SyntheticFieldDescriptor -> return KtSymbolOrigin.PROPERTY_BACKING_FIELD
        is SamConstructorDescriptor -> return KtSymbolOrigin.SAM_CONSTRUCTOR
        is JavaClassDescriptor, is JavaCallableMemberDescriptor -> return KtSymbolOrigin.JAVA

         * getter/setter) then this method is not used at all. Instead
         * [org.jetbrains.kotlin.backend.jvm.lower.ReflectiveAccessLowering.visitGetField] (or visitSetField) generates the access without
         * asking.
         */
        override fun isAccessorWithExplicitImplementation(accessor: IrSimpleFunction): Boolean {
            if (accessor is AbstractFir2IrLazyDeclaration<*>) {
                val fir = accessor.fir

        }

    override val hasBackingField: Boolean
        get() = withValidityAssertion {
            val bindingContext = analysisContext.analyze(psi, AnalysisMode.PARTIAL)
            bindingContext[BindingContext.BACKING_FIELD_REQUIRED, descriptor] == true
        }

    override val isDelegatedProperty: Boolean
        get() = withValidityAssertion {
            psi.hasDelegate()
        }

            // Destructuring declarations use their initializer.
            is KtDestructuringDeclaration ->
                parent.initializer == child

            // Backing field declarations use their initializer.
            is KtBackingField ->
                parent.initializer == child

            // Property accessors can use their bodies if not blocks.

            firDiagnostic as KtPsiDiagnostic,
            token,
        )
    }
    add(FirErrors.BACKING_FIELD_IN_INTERFACE) { firDiagnostic ->
        BackingFieldInInterfaceImpl(
            firDiagnostic as KtPsiDiagnostic,
            token,
        )
    }
    add(FirErrors.EXTENSION_PROPERTY_WITH_BACKING_FIELD) { firDiagnostic ->
        ExtensionPropertyWithBackingFieldImpl(

    override val hasBackingField: Boolean
        get() = withValidityAssertion {
            val bindingContext = analysisContext.resolveSession.bindingContext
            return bindingContext[BindingContext.BACKING_FIELD_REQUIRED, descriptor] == true
        }

    override val isDelegatedProperty: Boolean
        get() = withValidityAssertion { descriptor.isDelegated }

- [`KT-59849`](https://youtrack.jetbrains.com/issue/KT-59849) K2: IllegalArgumentException: List has more than one element
- [`KT-57553`](https://youtrack.jetbrains.com/issue/KT-57553) Implement deprecation for open val with backing field and deferred initialization in K1
- [`KT-57230`](https://youtrack.jetbrains.com/issue/KT-57230) Support Kotlin/Wasm in the K2 platform