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the comment filter example

Etienne's thesis has an example in the lexer part that shows how to make a
subclass of the lexer that overwrites filter().

One small remark: the signature of filter() has changed since then: it
throws exceptions.


setText in all the generated tokens throws RuntimeExceptions. So the example
that does comment.setText() wouldn't even work anymore. What's the
alternative if I want to change token text in filter() ?