protected Token prevToken(ListIterator<Token> iterator) {
        checkUnexpectedStart(iterator);
        Token tk = iterator.previous();

        if (tk instanceof CommentToken) {
            return prevToken(iterator);
        }

        return tk;
    }
Processes named token and returns them as named tokens.
jphp-core/src/org/develnext/jphp/core/syntax/generators/Generator.java