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;;; *last-label* holds the label# of the last used label.
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;;; *exit* holds an 'exit', which is
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;; ( label# . ref-flag ) or one of RETURNs (i.e. RETURN, RETURN-FIXNUM,
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;; RETURN-CHARACTER, RETURN-LONG-FLOAT, RETURN-SHORT-FLOAT, or
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;; RETURN-CHARACTER, RETURN-DOUBLE-FLOAT, RETURN-SINGLE-FLOAT, or
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;;; *unwind-exit* holds a list consisting of:
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;; ( label# . ref-flag ), one of RETURNs, TAIL-RECURSION-MARK, FRAME,