KtSuccessCallInfo:
  call = KtSimpleFunctionCall:
    isImplicitInvoke = true
    partiallyAppliedSymbol = KtPartiallyAppliedSymbol:
      dispatchReceiver = null
      extensionReceiver = KtExplicitReceiverValue:
        expression = x
        isSafeNavigation = false
        type = kotlin.Int
      signature = KtFunctionLikeSignature:
        receiverType = kotlin.Int
        returnType = kotlin.String
        symbol = /invoke(<extension receiver>: kotlin.Int): kotlin.String
        valueParameters = []
        callableIdIfNonLocal = /invoke
    typeArgumentsMapping = {}
    argumentMapping = {}