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====Interrupt handling==== The {{tt|RESIGNAL}}-statement executed in an ON-unit terminates execution of the ON-unit, and raises the condition again in the procedure that called the current one (thus passing control to the corresponding ON-unit for that procedure). The {{tt|INVALIDOP}} condition handles invalid operation codes detected by the PC processor, as well as illegal arithmetic operations such as subtraction of two infinite values. The {{tt|ANYCONDITION}} condition is provided to intercept conditions for which no specific ON-unit has been provided in the current procedure. The {{tt|STORAGE}} condition is raised when an {{tt|ALLOCATE}} statement is unable to obtain sufficient storage.
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