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introduced its own form of exception handling circa 1964, allowing interrupts to be handled with ON units.MacLisp observed that ERRSET and ERR were used not only for error raising, but for non-local control flow, and thus added two new keywords, CATCH and THROW (June 1972). The cleanup behavior now generally called "finally" was introduced in NIL (New Implementation of LISP) in the mid- to late-1970s as

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