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%option reentrant (–reentrant) must be specified.
Notice that %option reentrant
is specified in the above example
(see Reentrant Example. Had this option not been specified,
flex
would have happily generated a non-reentrant scanner without
complaining. You may explicitly specify %option noreentrant
, if
you do not want a reentrant scanner, although it is not
necessary. The default is to generate a non-reentrant scanner.