* For data classes & enums generated members like `copy` `componentN`, `values` it will return corresponding enum/data class
 * Otherwise, behaves the same way as [findPsi] returns exact PSI declaration corresponding to passed [FirDeclaration]
 */
fun FirDeclaration.findReferencePsi(): PsiElement? {
    return if (this is FirCallableDeclaration) {
        unwrapFakeOverridesOrDelegated().psi
    } else {
        psi

                    return ApplicableAsFunctionalVariableCall(substitutor, receiverCastRequired, token)
                }

                return ApplicableAsExtensionCallable(substitutor, receiverCastRequired, token)
            }

            return implicitReceivers.firstNotNullOfOrNull(::processReceiver)
                ?: processReceiver(null)

        if (this === other) return true
        if (javaClass != other?.javaClass) return false

        other as KtFe10FunctionLikeSignature<*>

        if (backingSymbol != other.backingSymbol) return false
        if (backingReturnType != other.backingReturnType) return false
        if (backingReceiverType != other.backingReceiverType) return false

        val element = elements.firstOrNull() ?: return BindingContext.EMPTY
        return getHandler(element).resolveSession.orThrowResolutionNotPerformedError().bindingContext
    }

    override fun getOrigin(file: VirtualFile): KtSymbolOrigin {
        return KtSymbolOrigin.SOURCE
    }

    private fun getHandler(useSiteElement: KtElement): KtFe10AnalysisHandlerExtension {

        get() = analysisSession.token

    override fun getResolveExtensionScopeWithTopLevelDeclarations(): KtScope {
        val tools = analysisSession.extensionTools
        if (tools.isEmpty()) return KtEmptyScope(token)
        return KtFirResolveExtensionScope(analysisSession, tools)
    }

    @OptIn(KtModuleStructureInternals::class)
    override fun isResolveExtensionFile(file: VirtualFile): Boolean =

                return file === ktFile || inlineObjectDeclarationFiles.contains(ktFile)
            }

            override fun shouldAnnotateClass(processingClassOrObject: KtClassOrObject): Boolean {
                return true
            }

            override fun shouldGenerateClass(processingClassOrObject: KtClassOrObject): Boolean {
                return processingClassOrObject.containingKtFile === file ||

    // without a body.
    override val enumEntryInitializer: KtEnumEntryInitializerSymbol?
        get() = this

    override fun createPointer(): KtSymbolPointer<KtEnumEntrySymbol> = withValidityAssertion {
        KtPsiBasedSymbolPointer.createForSymbolFromSource<KtEnumEntrySymbol>(this)?.let {
            return it
        }

                if (it.containingDeclaration != descriptor) return@mapNotNull null
                KtFe10DescTypeParameterSymbol(it, analysisContext)
            }
        }

    override fun createPointer(): KtSymbolPointer<KtConstructorSymbol> = withValidityAssertion {
        KtPsiBasedSymbolPointer.createForSymbolFromSource<KtConstructorSymbol>(this)?.let {
            return it
        }

        val function = assignment.operationReference.mainReference.resolve() as? KtNamedFunction ?: return null
        val name = function.name ?: return null
        return if (Name.identifier(name) in OperatorConventions.ASSIGNMENT_OPERATIONS.values)
            ReferenceAccess.READ to assignment
        else
            null
    }

        KtPsiBasedSymbolPointer.createForSymbolFromSource<KtSamConstructorSymbol>(this)?.let {
            return it
        }

        val classId = descriptor.baseDescriptorForSynthetic.classId
        if (classId != null) {
            return KtFe10DescSamConstructorSymbolPointer(classId)
        }

        return KtFe10NeverRestoringSymbolPointer()
    }

    override fun equals(other: Any?): Boolean = isEqualTo(other)