Reported by evgen-i on 2014-07-30 10:07 UTC
It seems like %caseless is not working the way it should in jflex 1.6.0:

%class XxxTokenizer
%unicode
%function next
%type Object
%char
%caseless

/** the first rule: **/
c[+][+] { return getNext(); }

This rule matches c++ (keeps it as one token), but not C++ (it gets split into C + +). Until version 1.5.1, C++ was also matched.