R.I. Gen. Laws § 39-16-15: Pledge not to alter rights of authority.

The state does hereby pledge to and agree with the holders of the bonds, notes, and other evidences of indebtedness of the authority that the state will not limit or alter rights hereby vested in the authority until the bonds, notes, or other evidences of indebtedness, together with interest thereon, with interest on any unpaid installment of interest and all costs and expenses in connection with any actions or proceedings by or on behalf of the bondholders, are fully met and discharged.