RendererList.php

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

class RendererList extends AbstractBlock
{
    protected $rendererTemplates = [];

    public function getRenderer($type, $default = null, $rendererTemplate = null)
    {
        $renderer = $this->getChildBlock($type) ?: $this->getChildBlock($default);
        if (!$renderer instanceof BlockInterface) {
            throw new \RuntimeException('Renderer for type "' . $type . '" does not exist.');
        }
        $renderer->setRenderedBlock($this);

        if (!isset($this->rendererTemplates[$type])) {
            $this->rendererTemplates[$type] = $renderer->getTemplate();
        } else {
            $renderer->setTemplate($this->rendererTemplates[$type]);
        }

        if ($rendererTemplate) {
            $renderer->setTemplate($rendererTemplate);
        }
        return $renderer;
    }
}