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<?php

require "autoload.php";

use Drupal\Component\DependencyInjection\Dumper\PhpArrayDumper;
use Drupal\Core\DependencyInjection\ContainerBuilder;
use Symfony\Component\DependencyInjection\Reference;

/*

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diff --git a/core/lib/Drupal/Core/Render/Renderer.php b/core/lib/Drupal/Core/Render/Renderer.php
index f2be9ce..82f6228 100644
--- a/core/lib/Drupal/Core/Render/Renderer.php
+++ b/core/lib/Drupal/Core/Render/Renderer.php
@@ -131,10 +131,23 @@ public function renderRoot(&$elements) {
 
     // Render in its own render context.
     $this->isRenderingRoot = TRUE;
-    $output = $this->executeInRenderContext(new RenderContext(), function () use (&$elements) {
-      return $this->render($elements, TRUE);

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diff --git a/core/modules/block/src/BlockRepository.php b/core/modules/block/src/BlockRepository.php
index 485a66f..e2aa34e 100644
--- a/core/modules/block/src/BlockRepository.php
+++ b/core/modules/block/src/BlockRepository.php
@@ -77,9 +77,8 @@ public function getVisibleBlocksPerRegion(array $contexts) {
     foreach ($this->blockStorage->loadByProperties(array('theme' => $this->getTheme())) as $block_id => $block) {
       /** @var \Drupal\block\BlockInterface $block */
       // Set the contexts on the block before checking access.
-      if ($block->setContexts($contexts)->access('view')) {
-        $full[$block->getRegion()][$block_id] = $block;

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diff --git a/core/lib/Drupal/Core/Template/TwigExtension.php b/core/lib/Drupal/Core/Template/TwigExtension.php
index bb29cd1..5461283 100644
--- a/core/lib/Drupal/Core/Template/TwigExtension.php
+++ b/core/lib/Drupal/Core/Template/TwigExtension.php
@@ -420,7 +420,11 @@ public function renderVar($arg) {
     }
 
     if (is_object($arg)) {
-      if (method_exists($arg, '__toString')) {
+      // @todo Replace with a proper interface.

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diff --git a/core/lib/Drupal/Core/Render/BubbleableMetadata.php b/core/lib/Drupal/Core/Render/BubbleableMetadata.php
index c56b421..748bc0b 100644
--- a/core/lib/Drupal/Core/Render/BubbleableMetadata.php
+++ b/core/lib/Drupal/Core/Render/BubbleableMetadata.php
@@ -39,6 +39,13 @@ class BubbleableMetadata {
   protected $postRenderCache;
 
   /**
+   * #placeholder metadata.
+   *

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diff --git a/core/lib/Drupal/Core/Render/Renderer.php b/core/lib/Drupal/Core/Render/Renderer.php
index 69e99a0..8bdf86a 100644
--- a/core/lib/Drupal/Core/Render/Renderer.php
+++ b/core/lib/Drupal/Core/Render/Renderer.php
@@ -184,6 +184,11 @@ protected function doRender(&$elements, $is_root_call = FALSE) {
         $this->bubbleStack();
         return $elements['#markup'];
       }
+
+      // Store the cache ID for later comparison.

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diff --git a/core/includes/theme.inc b/core/includes/theme.inc
index 47c99d9..30380f8 100644
--- a/core/includes/theme.inc
+++ b/core/includes/theme.inc
@@ -11,6 +11,7 @@
 use Drupal\Core\Cache\CacheBackendInterface;
 use Drupal\Core\Template\Attribute;
 use Drupal\Core\Utility\ThemeRegistry;
+use Drupal\Component\PhpStorage\PhpStorageFactory;
 

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<?php

/**
 * @file
 * The PHP page that serves all page requests on a Drupal installation.
 *
 * The routines here dispatch control to the appropriate handler, which then
 * prints the appropriate page.
 *
 * All Drupal code is released under the GNU General Public License.

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<?php

component('ordered_list',
  array(
    component('item', 'a', array('id' => 'id-a')),
    'b',
    'c'),
  array('id' => 'x')
);

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=== blocks.twig
{% block sidebar %}
Right
{% endblock %}
=== test-base.twig
<side>
{% block sidebar %}Sidebar{% endblock %}

</side>