ExpectingCTEXT example

        if ($this->lexer->current->isA(EmailLexer::S_CR)) {
            return new InvalidEmail(new CRNoLF(), $this->lexer->current->value);
        }

        if ($this->lexer->isNextToken(EmailLexer::GENERIC) && !$previous->isA(EmailLexer::S_AT)) {
            return new InvalidEmail(new AtextAfterCFWS(), $this->lexer->current->value);
        }

        if ($this->lexer->current->isA(EmailLexer::S_LF) || $this->lexer->current->isA(EmailLexer::C_NUL)) {
            return new InvalidEmail(new ExpectingCTEXT(), $this->lexer->current->value);
        }

        if ($this->lexer->isNextToken(EmailLexer::S_AT) || $previous->isA(EmailLexer::S_AT)) {
            $this->warnings[CFWSNearAt::CODE] = new CFWSNearAt();
        } else {
            $this->warnings[CFWSWithFWS::CODE] = new CFWSWithFWS();
        }

        return new ValidEmail();
    }