return symbolsCache.cache(firSymbol) {
                KtFirBackingFieldSymbol(firSymbol, analysisSession)
            }
        }

        fun buildExtensionReceiverSymbol(firCallableSymbol: FirCallableSymbol<*>): KtReceiverParameterSymbol? {
            if (firCallableSymbol.fir.receiverParameter == null) return null

                val boundSymbol = boundSymbol
                when {
                    !isInLabelReference && boundSymbol is FirCallableSymbol<*> ->
                        symbolBuilder.callableBuilder.buildExtensionReceiverSymbol(boundSymbol)
                    else -> boundSymbol?.fir?.buildSymbol(symbolBuilder)
                }.let { listOfNotNull(it) }
            }
            is FirSuperReference -> {

                    is FirClassSymbol<*> -> partiallyAppliedSymbol.toKtSymbol()
                    is FirCallableSymbol<*> -> firSymbolBuilder.callableBuilder.buildExtensionReceiverSymbol(partiallyAppliedSymbol)
                        ?: return null
                    else -> return null
                }