(MIT) A LiSp operator which evaluateS an expreSSion and then, even if that expreSSion cauSeS a non-local exit, evaluateS zero or more other expreSSionS. ThiS can be uSed to enSure that eSSential "clean-up" operationS are performed even in the preSence of errorS. [Jargon File] (1994-11-03)