public Tag[] firstSentenceTags() {
        if (firstSentence == null) {
            //Parse all sentences first to avoid duplicate warnings.
            inlineTags();
            try {
                env.setSilent(true);
                firstSentence = Comment.firstSentenceTags(this, commentText());
            } finally {
                env.setSilent(false);
            }
        }
        return firstSentence;
    }