Breadcrumbs.php

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<?php
namespace Magento\Backend\Block\Widget;

class Breadcrumbs extends \Magento\Backend\Block\Template
{
    protected $_links = [];

    protected $_template = 'Magento_Backend::widget/breadcrumbs.phtml';

    protected function _construct()
    {
        $this->addLink(__('Home'), __('Home'), $this->getUrl('*'));
    }

    public function addLink($label, $title = null, $url = null)
    {
        if (empty($title)) {
            $title = $label;
        }
        $this->_links[] = ['label' => $label, 'title' => $title, 'url' => $url];
        return $this;
    }

    protected function _beforeToHtml()
    {
        // TODO - Moved to Beta 2, no breadcrumbs displaying in Beta 1
        // $this->assign('links', $this->_links);
        return parent::_beforeToHtml();
    }
}