DeprecatedComment example

$invalidTokens = $this->checkInvalidTokensAfterAT();
        if ($invalidTokens->isInvalid()) {
            return $invalidTokens;
        }

        $missingDomain = $this->checkEmptyDomain();
        if ($missingDomain->isInvalid()) {
            return $missingDomain;
        }

        if ($this->lexer->current->isA(EmailLexer::S_OPENPARENTHESIS)) {
            $this->warnings[DeprecatedComment::CODE] = new DeprecatedComment();
        }
        return new ValidEmail();
    }

    private function checkEmptyDomain(): Result
    {
        $thereIsNoDomain = $this->lexer->current->isA(EmailLexer::S_EMPTY) ||
            ($this->lexer->current->isA(EmailLexer::S_SP) &&
                !$this->lexer->isNextToken(EmailLexer::GENERIC));

        if ($thereIsNoDomain) {