When countries are close to default and bankrupt, seeking bailout from IMF or other supernational financial institutions (Greece, Argentina are recent examples), do they usually have to pledge or liquidate their gold bars?

Otherwise it seems a bit unfair where they just get to keep their gold, and then gets money from the IMF, with the donating nations having to bear the risk. Should not they liquidate their assets first to pay off whatever they can, before IMF rescues them?