(30 ILCS 355/18) (from Ch. 85, par. 1397k)
    Sec. 18. The State of Illinois irrevocably covenants and agrees with the holders of Bonds issued pursuant to this Act that the State will not limit or alter (a) the basis on which the taxes and revenues of the State are required to be collected and deposited in the MEAOB Fund and to be transferred from the MEAOB Fund; (b) the basis on which transfers of amounts credited to the MEAOB Fund are required to be made to the Bond Retirement Fund; (c) the purposes of the Bond Retirement Fund; or (d) the provisions of this Act or the provisions of "An Act in relation to State finance", approved June 10, 1919, as amended, so as to impair, in any of the foregoing respects, the obligations of contract incurred by the State in favor of the holders of Bonds issued under this Act. The covenant and agreement set forth in this Section may be included in any Bond Sale Order, trust indenture, agreement or Bond authorized under this Act.
(Source: P.A. 84-245.)