(flex.info)How do I abandon a file in the middle of a scan and switch to a new file?

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How do I abandon a file in the middle of a scan and switch to a new file?
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Just call 'yyrestart(newfile)'.  Be sure to reset the start state if you
want a "fresh start, since 'yyrestart' does NOT reset the start state
back to 'INITIAL'.