ExceptionHandlerBlock.php

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<?php
namespace Magento\Framework\View\Element;

use Magento\Framework\Exception\LocalizedException;
use Magento\Framework\Phrase;

class ExceptionHandlerBlock implements BlockInterface
{
    protected $blockName;

    public function __construct($blockName = '')
    {
        $this->blockName = $blockName;
    }

    public function __call($method, $args)
    {
        throw new LocalizedException(
            new Phrase('The "%1" block threw an exception, and it can\'t be rendered.', [$this->blockName])
        );
    }

    public function toHtml()
    {
        throw new LocalizedException(
            new Phrase('The "%1" block threw an exception, and it can\'t be rendered.', [$this->blockName])
        );
    }
}