See http://savage.net.au/Perl-modules/html/marpa.faq/faq.html#q127. I wrote
those 2 modules, and they each have a method called _validate_event(),
which I suggest may be relevant to your situation.
The point is that with ambiguity Marpa will generate multiple events at the
same point in the input stream, so there is no need to rewind Marpa to
rescan. Simply study the list of events generated and select one.
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