PhraseFactory.php

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<?php
namespace Magento\Framework\Message;

use Magento\Framework\Phrase;

class PhraseFactory
{
    public function create($mainMessage, $subMessages, $separator = '; ')
    {
        $renderedErrors = '';
        $eol = '';
        foreach ($subMessages as $subMessage) {
            if ($subMessage instanceof MessageInterface) {
                $phrase = new Phrase($subMessage->getText());
            } else {
                $phrase = new Phrase('Cannot render error message!');
            }
            $renderedErrors .= $eol . $phrase->render();
            $eol = $separator;
        }

        //$mainMessage should contain %1 to be substituted by concatenated errors
        return new Phrase($mainMessage, [$renderedErrors]);
    }
}