diff --git a/composer.lock b/composer.lock
index 3b126299e4..e298fe0344 100644
--- a/composer.lock
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@@ -1798,29 +1870,88 @@
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+            "time": "2017-10-11T12:05:26+00:00"
+        },
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+                    "email": "p@tchwork.com"
+                },
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@@ -1907,36 +2038,39 @@
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@@ -2094,7 +2235,7 @@
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@@ -2121,40 +2262,47 @@
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             "description": "Symfony Translation Component",
             "homepage": "https://symfony.com",
-            "time": "2017-04-12T14:13:17+00:00"
+            "time": "2018-01-03T07:37:34+00:00"
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-            "version": "v3.2.8",
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@@ -2165,13 +2313,13 @@
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                 "symfony/intl": "",
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@@ -2198,27 +2346,30 @@
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@@ -4019,25 +4170,25 @@
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             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/css-selector/zipball/02983c144038e697c959e6b06ef6666de759ccbc",
-                "reference": "02983c144038e697c959e6b06ef6666de759ccbc",
+                "url": "https://api.github.com/repos/symfony/css-selector/zipball/e66394bc7610e69279bfdb3ab11b4fe65403f556",
+                "reference": "e66394bc7610e69279bfdb3ab11b4fe65403f556",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.5.9"
+                "php": "^5.5.9|>=7.0.8"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "3.2-dev"
+                    "dev-master": "3.4-dev"
                 }
             },
             "autoload": {
@@ -4125,28 +4276,28 @@
             ],
             "description": "Symfony CssSelector Component",
             "homepage": "https://symfony.com",
-            "time": "2017-05-01T14:55:58+00:00"
+            "time": "2018-01-03T07:37:34+00:00"
         },
         {
             "name": "symfony/dom-crawler",
-            "version": "v3.2.8",
+            "version": "v3.4.3",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/dom-crawler.git",
-                "reference": "f1ad34e8af09ed17570e027cf0c58a12eddec286"
+                "reference": "09bd97b844b3151fab82f2fdd62db9c464b3910a"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/dom-crawler/zipball/f1ad34e8af09ed17570e027cf0c58a12eddec286",
-                "reference": "f1ad34e8af09ed17570e027cf0c58a12eddec286",
+                "url": "https://api.github.com/repos/symfony/dom-crawler/zipball/09bd97b844b3151fab82f2fdd62db9c464b3910a",
+                "reference": "09bd97b844b3151fab82f2fdd62db9c464b3910a",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.5.9",
+                "php": "^5.5.9|>=7.0.8",
                 "symfony/polyfill-mbstring": "~1.0"
             },
             "require-dev": {
-                "symfony/css-selector": "~2.8|~3.0"
+                "symfony/css-selector": "~2.8|~3.0|~4.0"
             },
             "suggest": {
                 "symfony/css-selector": ""
@@ -4154,7 +4305,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "3.2-dev"
+                    "dev-master": "3.4-dev"
                 }
             },
             "autoload": {
@@ -4181,7 +4332,7 @@
             ],
             "description": "Symfony DomCrawler Component",
             "homepage": "https://symfony.com",
-            "time": "2017-04-12T14:13:17+00:00"
+            "time": "2018-01-03T07:37:34+00:00"
         },
         {
             "name": "symfony/phpunit-bridge",
@@ -4258,7 +4409,7 @@
     "prefer-stable": true,
     "prefer-lowest": false,
     "platform": {
-        "php": ">=5.5.9"
+        "php": "^5.5.9|>=7.0.8"
     },
     "platform-dev": []
 }
diff --git a/core/composer.json b/core/composer.json
index aeb15b4d4d..2e1b1c29dd 100644
--- a/core/composer.json
+++ b/core/composer.json
@@ -4,20 +4,20 @@
     "type": "drupal-core",
     "license": "GPL-2.0+",
     "require": {
-        "php": ">=5.5.9",
-        "symfony/class-loader": "~3.2.8",
-        "symfony/console": "~3.2.8",
-        "symfony/dependency-injection": "~3.2.8",
-        "symfony/event-dispatcher": "~3.2.8",
-        "symfony/http-foundation": "~3.2.8",
-        "symfony/http-kernel": "~3.2.8",
-        "symfony/routing": "~3.2.8",
-        "symfony/serializer": "~3.2.8",
-        "symfony/translation": "~3.2.8",
-        "symfony/validator": "~3.2.8",
-        "symfony/process": "~3.2.8",
+        "php": "^5.5.9|>=7.0.8",
+        "symfony/class-loader": "~3.4.0",
+        "symfony/console": "~3.4.0",
+        "symfony/dependency-injection": "~3.4.0",
+        "symfony/event-dispatcher": "~3.4.0",
+        "symfony/http-foundation": "~3.4.0",
+        "symfony/http-kernel": "~3.4.0",
+        "symfony/routing": "~3.4.0",
+        "symfony/serializer": "~3.4.0",
+        "symfony/translation": "~3.4.0",
+        "symfony/validator": "~3.4.0",
+        "symfony/process": "~3.4.0",
         "symfony/polyfill-iconv": "^1.0",
-        "symfony/yaml": "~3.2.8",
+        "symfony/yaml": "~3.4.0",
         "twig/twig": "^1.35.0",
         "doctrine/common": "^2.5",
         "doctrine/annotations": "^1.2",
@@ -46,8 +46,9 @@
         "mikey179/vfsStream": "^1.2",
         "phpunit/phpunit": "^4.8.35 || ^6.1",
         "phpspec/prophecy": "^1.4",
-        "symfony/css-selector": "~3.2.8",
-        "symfony/phpunit-bridge": "^3.4.3"
+        "symfony/css-selector": "^3.4.0",
+        "symfony/phpunit-bridge": "^3.4.3",
+        "symfony/debug": "^3.4.0"
     },
     "replace": {
         "drupal/action": "self.version",
diff --git a/core/lib/Drupal/Component/DependencyInjection/Dumper/OptimizedPhpArrayDumper.php b/core/lib/Drupal/Component/DependencyInjection/Dumper/OptimizedPhpArrayDumper.php
index 11768d0c20..dfd2a431cc 100644
--- a/core/lib/Drupal/Component/DependencyInjection/Dumper/OptimizedPhpArrayDumper.php
+++ b/core/lib/Drupal/Component/DependencyInjection/Dumper/OptimizedPhpArrayDumper.php
@@ -65,7 +65,7 @@ public function getArray() {
     $definition['aliases'] = $this->getAliases();
     $definition['parameters'] = $this->getParameters();
     $definition['services'] = $this->getServiceDefinitions();
-    $definition['frozen'] = $this->container->isFrozen();
+    $definition['frozen'] = $this->container->isCompiled();
     $definition['machine_format'] = $this->supportsMachineFormat();
     return $definition;
   }
@@ -103,8 +103,8 @@ protected function getParameters() {
     }
 
     $parameters = $this->container->getParameterBag()->all();
-    $is_frozen = $this->container->isFrozen();
-    return $this->prepareParameters($parameters, $is_frozen);
+    $is_compiled = $this->container->isCompiled();
+    return $this->prepareParameters($parameters, $is_compiled);
   }
 
   /**
@@ -309,10 +309,10 @@ protected function dumpCollection($collection, &$resolve = FALSE) {
         }
       }
       else {
-        if (is_object($value)) {
+        $code[$key] = $this->dumpValue($value);
+        if (is_object($code[$key])) {
           $resolve = TRUE;
         }
-        $code[$key] = $this->dumpValue($value);
       }
     }
 
@@ -403,6 +403,9 @@ protected function dumpValue($value) {
     elseif ($value instanceof Parameter) {
       return $this->getParameterCall((string) $value);
     }
+    elseif (is_string($value) && preg_match('/^\%(.*)\%$/', $value, $matches)) {
+      return $this->getParameterCall($matches[1]);
+    }
     elseif ($value instanceof Expression) {
       throw new RuntimeException('Unable to use expressions as the Symfony ExpressionLanguage component is not installed.');
     }
diff --git a/core/lib/Drupal/Component/EventDispatcher/ContainerAwareEventDispatcher.php b/core/lib/Drupal/Component/EventDispatcher/ContainerAwareEventDispatcher.php
index a23f333a0a..1fd808c17f 100644
--- a/core/lib/Drupal/Component/EventDispatcher/ContainerAwareEventDispatcher.php
+++ b/core/lib/Drupal/Component/EventDispatcher/ContainerAwareEventDispatcher.php
@@ -104,8 +104,11 @@ public function dispatch($event_name, Event $event = NULL) {
           if (!isset($definition['callable'])) {
             $definition['callable'] = [$this->container->get($definition['service'][0]), $definition['service'][1]];
           }
+          if (is_array($definition['callable']) && isset($definition['callable'][0]) && $definition['callable'][0] instanceof \Closure) {
+            $definition['callable'][0] = $definition['callable'][0]();
+          }
 
-          $definition['callable']($event, $event_name, $this);
+          call_user_func($definition['callable'], $event, $event_name, $this);
           if ($event->isPropagationStopped()) {
             return $event;
           }
@@ -144,6 +147,9 @@ public function getListeners($event_name = NULL) {
           if (!isset($definition['callable'])) {
             $definition['callable'] = [$this->container->get($definition['service'][0]), $definition['service'][1]];
           }
+          if (is_array($definition['callable']) && isset($definition['callable'][0]) && $definition['callable'][0] instanceof \Closure) {
+            $definition['callable'][0] = $definition['callable'][0]();
+          }
 
           $result[] = $definition['callable'];
         }
@@ -156,27 +162,29 @@ public function getListeners($event_name = NULL) {
   /**
    * {@inheritdoc}
    */
-  public function getListenerPriority($eventName, $listener) {
-    // Parts copied from \Symfony\Component\EventDispatcher, that's why you see
-    // a yoda condition here.
-    if (!isset($this->listeners[$eventName])) {
+  public function getListenerPriority($event_name, $listener) {
+    if (!isset($this->listeners[$event_name])) {
       return;
     }
-    foreach ($this->listeners[$eventName] as $priority => $listeners) {
-      if (FALSE !== ($key = array_search(['callable' => $listener], $listeners, TRUE))) {
-        return $priority;
-      }
+    if (is_array($listener) && isset($listener[0]) && $listener[0] instanceof \Closure) {
+      $listener[0] = $listener[0]();
     }
     // Resolve service definitions if the listener has not been found so far.
-    foreach ($this->listeners[$eventName] as $priority => &$definitions) {
+    foreach ($this->listeners[$event_name] as $priority => &$definitions) {
       foreach ($definitions as $key => &$definition) {
         if (!isset($definition['callable'])) {
           // Once the callable is retrieved we keep it for subsequent method
           // invocations on this class.
-          $definition['callable'] = [$this->container->get($definition['service'][0]), $definition['service'][1]];
-          if ($definition['callable'] === $listener) {
-            return $priority;
-          }
+          $definition['callable'] = [
+            $this->container->get($definition['service'][0]),
+            $definition['service'][1],
+          ];
+        }
+        if (is_array($definition['callable']) && isset($definition['callable'][0]) && $definition['callable'][0] instanceof \Closure) {
+          $definition['callable'][0] = $definition['callable'][0]();
+        }
+        if ($definition['callable'] === $listener) {
+          return $priority;
         }
       }
     }
@@ -186,7 +194,17 @@ public function getListenerPriority($eventName, $listener) {
    * {@inheritdoc}
    */
   public function hasListeners($event_name = NULL) {
-    return (bool) count($this->getListeners($event_name));
+    if ($event_name !== NULL) {
+      return !empty($this->listeners[$event_name]);
+    }
+
+    foreach ($this->listeners as $event_listeners) {
+      if ($event_listeners) {
+        return TRUE;
+      }
+    }
+
+    return FALSE;
   }
 
   /**
@@ -214,10 +232,23 @@ public function removeListener($event_name, $listener) {
           $definition['callable'] = [$this->container->get($definition['service'][0]), $definition['service'][1]];
         }
 
+        if (is_array($definition['callable']) && isset($definition['callable'][0]) && $definition['callable'][0] instanceof \Closure && !$listener instanceof \Closure) {
+          $definition['callable'][0] = $definition['callable'][0]();
+        }
+
+        if (is_array($definition['callable']) && isset($definition['callable'][0]) && !$definition['callable'][0] instanceof \Closure && is_array($listener) && isset($listener[0]) && $listener[0] instanceof \Closure) {
+          $listener[0] = $listener[0]();
+        }
         if ($definition['callable'] === $listener) {
-          unset($this->listeners[$event_name][$priority][$key]);
+          unset($definitions[$key]);
         }
       }
+      if ($definitions) {
+        $this->listeners[$event_name][$priority] = $definitions;
+      }
+      else {
+        unset($this->listeners[$event_name][$priority]);
+      }
     }
   }
 
diff --git a/core/lib/Drupal/Component/Serialization/YamlSymfony.php b/core/lib/Drupal/Component/Serialization/YamlSymfony.php
index d35e09cd48..efe3039df7 100644
--- a/core/lib/Drupal/Component/Serialization/YamlSymfony.php
+++ b/core/lib/Drupal/Component/Serialization/YamlSymfony.php
@@ -34,7 +34,7 @@ public static function decode($raw) {
       $yaml = new Parser();
       // Make sure we have a single trailing newline. A very simple config like
       // 'foo: bar' with no newline will fail to parse otherwise.
-      return $yaml->parse($raw, SymfonyYaml::PARSE_EXCEPTION_ON_INVALID_TYPE);
+      return $yaml->parse($raw, SymfonyYaml::PARSE_EXCEPTION_ON_INVALID_TYPE | SymfonyYaml::PARSE_KEYS_AS_STRINGS);
     }
     catch (\Exception $e) {
       throw new InvalidDataTypeException($e->getMessage(), $e->getCode(), $e);
diff --git a/core/lib/Drupal/Core/DependencyInjection/ContainerBuilder.php b/core/lib/Drupal/Core/DependencyInjection/ContainerBuilder.php
index e0becc71e2..f6c34084ba 100644
--- a/core/lib/Drupal/Core/DependencyInjection/ContainerBuilder.php
+++ b/core/lib/Drupal/Core/DependencyInjection/ContainerBuilder.php
@@ -48,7 +48,7 @@ private function getProxyInstantiator()
   /**
    * {@inheritdoc}
    */
-  protected function shareService(Definition $definition, $service, $id)
+  protected function shareService(Definition $definition, $service, $id, array &$inlineServices)
   {
     if ($definition->isShared()) {
       $this->services[$lowerId = strtolower($id)] = $service;
@@ -85,7 +85,20 @@ public function register($id, $class = null) {
     if (strtolower($id) !== $id) {
       throw new \InvalidArgumentException("Service ID names must be lowercase: $id");
     }
-    return parent::register($id, $class);
+    $definition = parent::register($id, $class);
+    // As of Symfony 3.4 all services are private by default.
+    $definition->setPublic(TRUE);
+    return $definition;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setAlias($alias, $id) {
+    $alias = parent::setAlias($alias, $id);
+    // As of Symfony 3.4 all aliases are private by default.
+    $alias->setPublic(TRUE);
+    return $alias;
   }
 
   /**
@@ -101,7 +114,7 @@ public function setParameter($name, $value) {
   /**
    * A 1to1 copy of parent::callMethod.
    */
-  protected function callMethod($service, $call) {
+  protected function callMethod($service, $call, array &$inlineServices = array()) {
     $services = self::getServiceConditionals($call[1]);
 
     foreach ($services as $s) {
diff --git a/core/lib/Drupal/Core/DependencyInjection/YamlFileLoader.php b/core/lib/Drupal/Core/DependencyInjection/YamlFileLoader.php
index d999450b0a..c87193a2f0 100644
--- a/core/lib/Drupal/Core/DependencyInjection/YamlFileLoader.php
+++ b/core/lib/Drupal/Core/DependencyInjection/YamlFileLoader.php
@@ -8,7 +8,7 @@
 use Symfony\Component\DependencyInjection\Alias;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\DependencyInjection\Definition;
-use Symfony\Component\DependencyInjection\DefinitionDecorator;
+use Symfony\Component\DependencyInjection\ChildDefinition;
 use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
 
@@ -155,9 +155,11 @@ private function parseDefinition($id, $service, $file)
         }
 
         if (isset($service['parent'])) {
-            $definition = new DefinitionDecorator($service['parent']);
+            $definition = new ChildDefinition($service['parent']);
         } else {
             $definition = new Definition();
+            // As of Symfony 3.4 all services are private by default.
+            $definition->setPublic(TRUE);
         }
 
         if (isset($service['class'])) {
diff --git a/core/lib/Drupal/Core/Form/EventSubscriber/FormAjaxSubscriber.php b/core/lib/Drupal/Core/Form/EventSubscriber/FormAjaxSubscriber.php
index 6c9c1788f2..0e49c5bb08 100644
--- a/core/lib/Drupal/Core/Form/EventSubscriber/FormAjaxSubscriber.php
+++ b/core/lib/Drupal/Core/Form/EventSubscriber/FormAjaxSubscriber.php
@@ -76,10 +76,10 @@ public function onException(GetResponseForExceptionEvent $event) {
     // the configured upload limit.
     if ($exception instanceof BrokenPostRequestException && $request->query->has(FormBuilderInterface::AJAX_FORM_REQUEST)) {
       $this->drupalSetMessage($this->t('An unrecoverable error occurred. The uploaded file likely exceeded the maximum file size (@size) that this server supports.', ['@size' => $this->formatSize($exception->getSize())]), 'error');
-      $response = new AjaxResponse();
+      $response = new AjaxResponse(NULL, 200);
       $status_messages = ['#type' => 'status_messages'];
       $response->addCommand(new PrependCommand(NULL, $status_messages));
-      $response->headers->set('X-Status-Code', 200);
+      $event->allowCustomResponseCode();
       $event->setResponse($response);
       return;
     }
@@ -99,7 +99,8 @@ public function onException(GetResponseForExceptionEvent $event) {
 
         // Since this response is being set in place of an exception, explicitly
         // mark this as a 200 status.
-        $response->headers->set('X-Status-Code', 200);
+        $response->setStatusCode(200);
+        $event->allowCustomResponseCode();
         $event->setResponse($response);
       }
       catch (\Exception $e) {
diff --git a/core/lib/Drupal/Core/StackMiddleware/ReverseProxyMiddleware.php b/core/lib/Drupal/Core/StackMiddleware/ReverseProxyMiddleware.php
index e3e4895efe..cf4cd89cb5 100644
--- a/core/lib/Drupal/Core/StackMiddleware/ReverseProxyMiddleware.php
+++ b/core/lib/Drupal/Core/StackMiddleware/ReverseProxyMiddleware.php
@@ -59,23 +59,23 @@ public static function setSettingsOnRequest(Request $request, Settings $settings
     // Initialize proxy settings.
     if ($settings->get('reverse_proxy', FALSE)) {
       $ip_header = $settings->get('reverse_proxy_header', 'X_FORWARDED_FOR');
-      $request::setTrustedHeaderName($request::HEADER_CLIENT_IP, $ip_header);
+      $request::setTrustedHeaderName($request::HEADER_X_FORWARDED_FOR, $ip_header);
 
       $proto_header = $settings->get('reverse_proxy_proto_header', 'X_FORWARDED_PROTO');
-      $request::setTrustedHeaderName($request::HEADER_CLIENT_PROTO, $proto_header);
+      $request::setTrustedHeaderName($request::HEADER_X_FORWARDED_PROTO, $proto_header);
 
       $host_header = $settings->get('reverse_proxy_host_header', 'X_FORWARDED_HOST');
-      $request::setTrustedHeaderName($request::HEADER_CLIENT_HOST, $host_header);
+      $request::setTrustedHeaderName($request::HEADER_X_FORWARDED_HOST, $host_header);
 
       $port_header = $settings->get('reverse_proxy_port_header', 'X_FORWARDED_PORT');
-      $request::setTrustedHeaderName($request::HEADER_CLIENT_PORT, $port_header);
+      $request::setTrustedHeaderName($request::HEADER_X_FORWARDED_PORT, $port_header);
 
       $forwarded_header = $settings->get('reverse_proxy_forwarded_header', 'FORWARDED');
       $request::setTrustedHeaderName($request::HEADER_FORWARDED, $forwarded_header);
 
       $proxies = $settings->get('reverse_proxy_addresses', []);
       if (count($proxies) > 0) {
-        $request::setTrustedProxies($proxies);
+        $request::setTrustedProxies($proxies, Request::HEADER_X_FORWARDED_ALL | Request::HEADER_FORWARDED);
       }
     }
   }
diff --git a/core/modules/comment/tests/src/Functional/CommentPreviewTest.php b/core/modules/comment/tests/src/Functional/CommentPreviewTest.php
index 868ebe470d..91544b6367 100644
--- a/core/modules/comment/tests/src/Functional/CommentPreviewTest.php
+++ b/core/modules/comment/tests/src/Functional/CommentPreviewTest.php
@@ -117,6 +117,8 @@ public function testCommentPreviewDuplicateSubmission() {
 
     // Go back and re-submit the form.
     $this->getSession()->getDriver()->back();
+    $submit_button = $this->assertSession()->buttonExists('Save');
+    $submit_button->click();
     $this->assertText('Your comment has been posted.');
     $elements = $this->xpath('//section[contains(@class, "comment-wrapper")]/article');
     $this->assertEqual(2, count($elements));
diff --git a/core/modules/rest/src/RestServiceProvider.php b/core/modules/rest/src/RestServiceProvider.php
index e705de4177..ca63bc7ae6 100644
--- a/core/modules/rest/src/RestServiceProvider.php
+++ b/core/modules/rest/src/RestServiceProvider.php
@@ -7,7 +7,7 @@
 use Drupal\rest\LinkManager\LinkManager;
 use Drupal\rest\LinkManager\RelationLinkManager;
 use Drupal\rest\LinkManager\TypeLinkManager;
-use Symfony\Component\DependencyInjection\DefinitionDecorator;
+use Symfony\Component\DependencyInjection\ChildDefinition;
 use Symfony\Component\DependencyInjection\Reference;
 
 /**
@@ -28,21 +28,21 @@ public function register(ContainerBuilder $container) {
       // @deprecated in Drupal 8.3.x and will be removed before Drupal 9.0.0.
       //   Use hal.link_manager instead.
       // @see https://www.drupal.org/node/2830467
-      $service_definition = new DefinitionDecorator(new Reference('hal.link_manager'));
+      $service_definition = new ChildDefinition(new Reference('hal.link_manager'));
       $service_definition->setClass(LinkManager::class);
       $container->setDefinition('rest.link_manager', $service_definition);
 
       // @deprecated in Drupal 8.3.x and will be removed before Drupal 9.0.0.
       //   Use hal.link_manager.type instead.
       // @see https://www.drupal.org/node/2830467
-      $service_definition = new DefinitionDecorator(new Reference('hal.link_manager.type'));
+      $service_definition = new ChildDefinition(new Reference('hal.link_manager.type'));
       $service_definition->setClass(TypeLinkManager::class);
       $container->setDefinition('rest.link_manager.type', $service_definition);
 
       // @deprecated in Drupal 8.3.x and will be removed before Drupal 9.0.0.
       //   Use hal.link_manager.relation instead.
       // @see https://www.drupal.org/node/2830467
-      $service_definition = new DefinitionDecorator(new Reference('hal.link_manager.relation'));
+      $service_definition = new ChildDefinition(new Reference('hal.link_manager.relation'));
       $service_definition->setClass(RelationLinkManager::class);
       $container->setDefinition('rest.link_manager.relation', $service_definition);
     }
diff --git a/core/tests/Drupal/Tests/Component/DependencyInjection/Dumper/OptimizedPhpArrayDumperTest.php b/core/tests/Drupal/Tests/Component/DependencyInjection/Dumper/OptimizedPhpArrayDumperTest.php
index c1b70954d1..2ed2e74158 100644
--- a/core/tests/Drupal/Tests/Component/DependencyInjection/Dumper/OptimizedPhpArrayDumperTest.php
+++ b/core/tests/Drupal/Tests/Component/DependencyInjection/Dumper/OptimizedPhpArrayDumperTest.php
@@ -68,7 +68,7 @@ protected function setUp() {
       $this->containerBuilder->getAliases()->willReturn([]);
       $this->containerBuilder->getParameterBag()->willReturn(new ParameterBag());
       $this->containerBuilder->getDefinitions()->willReturn(NULL);
-      $this->containerBuilder->isFrozen()->willReturn(TRUE);
+      $this->containerBuilder->isCompiled()->willReturn(TRUE);
 
       $definition = [];
       $definition['aliases'] = [];
@@ -147,7 +147,7 @@ public function testGetParameters($parameters, $definition_parameters, $is_froze
 
       $parameter_bag = new ParameterBag($parameters);
       $this->containerBuilder->getParameterBag()->willReturn($parameter_bag);
-      $this->containerBuilder->isFrozen()->willReturn($is_frozen);
+      $this->containerBuilder->isCompiled()->willReturn($is_frozen);
 
       if (isset($parameters['reference'])) {
         $definition = new Definition('\stdClass');
diff --git a/core/tests/Drupal/Tests/Component/EventDispatcher/ContainerAwareEventDispatcherTest.php b/core/tests/Drupal/Tests/Component/EventDispatcher/ContainerAwareEventDispatcherTest.php
index a750ecaf09..baafcd594b 100644
--- a/core/tests/Drupal/Tests/Component/EventDispatcher/ContainerAwareEventDispatcherTest.php
+++ b/core/tests/Drupal/Tests/Component/EventDispatcher/ContainerAwareEventDispatcherTest.php
@@ -193,4 +193,59 @@ public function testGetListenerPriorityWithServices()
         $this->assertSame(5, $actualPriority);
     }
 
+    /**
+     * @expectedDeprecation The Symfony\Component\EventDispatcher\ContainerAwareEventDispatcher class is deprecated since Symfony 3.3 and will be removed in 4.0. Use EventDispatcher with closure factories instead.
+     * @group legacy
+     */
+    public function testAddAListenerService() {
+      parent::testAddAListenerService();
+    }
+
+    /**
+     * @expectedDeprecation The Symfony\Component\EventDispatcher\ContainerAwareEventDispatcher class is deprecated since Symfony 3.3 and will be removed in 4.0. Use EventDispatcher with closure factories instead.
+     * @group legacy
+     */
+    public function testPreventDuplicateListenerService() {
+      parent::testPreventDuplicateListenerService();
+    }
+
+    /**
+     * @expectedDeprecation The Symfony\Component\EventDispatcher\ContainerAwareEventDispatcher class is deprecated since Symfony 3.3 and will be removed in 4.0. Use EventDispatcher with closure factories instead.
+     * @group legacy
+     */
+    public function testAddASubscriberService() {
+      parent::testAddASubscriberService();
+    }
+
+    /**
+     * @expectedDeprecation The Symfony\Component\EventDispatcher\ContainerAwareEventDispatcher class is deprecated since Symfony 3.3 and will be removed in 4.0. Use EventDispatcher with closure factories instead.
+     * @group legacy
+     */
+    public function testHasListenersOnLazyLoad() {
+      parent::testHasListenersOnLazyLoad();
+    }
+
+    /**
+     * @expectedDeprecation The Symfony\Component\EventDispatcher\ContainerAwareEventDispatcher class is deprecated since Symfony 3.3 and will be removed in 4.0. Use EventDispatcher with closure factories instead.
+     * @group legacy
+     */
+    public function testGetListenersOnLazyLoad() {
+      parent::testGetListenersOnLazyLoad();
+    }
+
+    /**
+     * @expectedDeprecation The Symfony\Component\EventDispatcher\ContainerAwareEventDispatcher class is deprecated since Symfony 3.3 and will be removed in 4.0. Use EventDispatcher with closure factories instead.
+     * @group legacy
+     */
+    public function testRemoveAfterDispatch() {
+      parent::testRemoveAfterDispatch();
+    }
+
+    /**
+     * @expectedDeprecation The Symfony\Component\EventDispatcher\ContainerAwareEventDispatcher class is deprecated since Symfony 3.3 and will be removed in 4.0. Use EventDispatcher with closure factories instead.
+     * @group legacy
+     */
+    public function testRemoveBeforeDispatch() {
+      parent::testRemoveBeforeDispatch();
+    }
  }
diff --git a/core/tests/Drupal/Tests/Component/Serialization/YamlTest.php b/core/tests/Drupal/Tests/Component/Serialization/YamlTest.php
index becd7c0221..e627715637 100644
--- a/core/tests/Drupal/Tests/Component/Serialization/YamlTest.php
+++ b/core/tests/Drupal/Tests/Component/Serialization/YamlTest.php
@@ -77,20 +77,40 @@ public function testYamlFiles($file) {
   }
 
   /**
-   * Ensures that decoding php objects is similar for PECL and Symfony.
+   * Ensures that decoding php objects does not work in PECL.
    *
    * @requires extension yaml
+   *
+   * @see \Drupal\Tests\Component\Serialization\YamlTest::testObjectSupportDisabledSymfony()
    */
-  public function testObjectSupportDisabled() {
+  public function testObjectSupportDisabledPecl() {
     $object = new \stdClass();
     $object->foo = 'bar';
     // In core all Yaml encoding is done via Symfony and it does not support
-    // objects so in order to encode an object we hace to use the PECL
+    // objects so in order to encode an object we have to use the PECL
     // extension.
     // @see \Drupal\Component\Serialization\Yaml::encode()
     $yaml = YamlPecl::encode([$object]);
     $this->assertEquals(['O:8:"stdClass":1:{s:3:"foo";s:3:"bar";}'], YamlPecl::decode($yaml));
-    $this->assertEquals(['!php/object "O:8:\"stdClass\":1:{s:3:\"foo\";s:3:\"bar\";}"'], YamlSymfony::decode($yaml));
+  }
+
+  /**
+   * Ensures that decoding php objects does not work in Symfony.
+   *
+   * @requires extension yaml
+   *
+   * @see \Drupal\Tests\Component\Serialization\YamlTest::testObjectSupportDisabledPecl()
+   */
+  public function testObjectSupportDisabledSymfony() {
+    $this->setExpectedExceptionRegExp(InvalidDataTypeException::class, '/^Object support when parsing a YAML file has been disabled/');
+    $object = new \stdClass();
+    $object->foo = 'bar';
+    // In core all Yaml encoding is done via Symfony and it does not support
+    // objects so in order to encode an object we have to use the PECL
+    // extension.
+    // @see \Drupal\Component\Serialization\Yaml::encode()
+    $yaml = YamlPecl::encode([$object]);
+    YamlSymfony::decode($yaml);
   }
 
   /**
diff --git a/core/tests/Drupal/Tests/Core/DependencyInjection/Compiler/ProxyServicesPassTest.php b/core/tests/Drupal/Tests/Core/DependencyInjection/Compiler/ProxyServicesPassTest.php
index aea2524ebf..638bd1512e 100644
--- a/core/tests/Drupal/Tests/Core/DependencyInjection/Compiler/ProxyServicesPassTest.php
+++ b/core/tests/Drupal/Tests/Core/DependencyInjection/Compiler/ProxyServicesPassTest.php
@@ -39,7 +39,7 @@ public function testContainerWithoutLazyServices() {
 
     $this->proxyServicesPass->process($container);
 
-    $this->assertCount(1, $container->getDefinitions());
+    $this->assertCount(2, $container->getDefinitions());
     $this->assertEquals('Drupal\Core\Plugin\CachedDiscoveryClearer', $container->getDefinition('plugin_cache_clearer')->getClass());
   }
 
@@ -53,7 +53,7 @@ public function testContainerWithLazyServices() {
 
     $this->proxyServicesPass->process($container);
 
-    $this->assertCount(2, $container->getDefinitions());
+    $this->assertCount(3, $container->getDefinitions());
 
     $non_proxy_definition = $container->getDefinition('drupal.proxy_original_service.plugin_cache_clearer');
     $this->assertEquals('Drupal\Core\Plugin\CachedDiscoveryClearer', $non_proxy_definition->getClass());
diff --git a/core/tests/Drupal/Tests/Core/DependencyInjection/Compiler/TaggedHandlersPassTest.php b/core/tests/Drupal/Tests/Core/DependencyInjection/Compiler/TaggedHandlersPassTest.php
index 5fe2b4478c..848c458a75 100644
--- a/core/tests/Drupal/Tests/Core/DependencyInjection/Compiler/TaggedHandlersPassTest.php
+++ b/core/tests/Drupal/Tests/Core/DependencyInjection/Compiler/TaggedHandlersPassTest.php
@@ -38,7 +38,7 @@ public function testProcessNoConsumers() {
     $handler_pass = new TaggedHandlersPass();
     $handler_pass->process($container);
 
-    $this->assertCount(1, $container->getDefinitions());
+    $this->assertCount(2, $container->getDefinitions());
     $this->assertFalse($container->getDefinition('consumer_id')->hasMethodCall('addHandler'));
   }
 
diff --git a/core/tests/Drupal/Tests/Core/DependencyInjection/ContainerBuilderTest.php b/core/tests/Drupal/Tests/Core/DependencyInjection/ContainerBuilderTest.php
index 026154da70..08465d6381 100644
--- a/core/tests/Drupal/Tests/Core/DependencyInjection/ContainerBuilderTest.php
+++ b/core/tests/Drupal/Tests/Core/DependencyInjection/ContainerBuilderTest.php
@@ -61,6 +61,25 @@ public function testRegisterException() {
     $container->register('Bar');
   }
 
+  /**
+   * @covers ::register
+   */
+  public function testRegister() {
+    $container = new ContainerBuilder();
+    $service = $container->register('bar');
+    $this->assertTrue($service->isPublic());
+  }
+
+  /**
+   * @covers ::setAlias
+   */
+  public function testSetAlias() {
+    $container = new ContainerBuilder();
+    $container->register('bar');
+    $alias = $container->setAlias('foo', 'bar');
+    $this->assertTrue($alias->isPublic());
+  }
+
   /**
    * Tests serialization.
    */
diff --git a/core/tests/Drupal/Tests/Core/DependencyInjection/YamlFileLoaderTest.php b/core/tests/Drupal/Tests/Core/DependencyInjection/YamlFileLoaderTest.php
index 97b2c942d2..4093b6a2eb 100644
--- a/core/tests/Drupal/Tests/Core/DependencyInjection/YamlFileLoaderTest.php
+++ b/core/tests/Drupal/Tests/Core/DependencyInjection/YamlFileLoaderTest.php
@@ -28,6 +28,9 @@ public function testParseDefinitionsWithProvider() {
 services:
   example_service:
     class: \Drupal\Core\ExampleClass
+  example_private_service:
+    class: \Drupal\Core\ExampleClass
+    public: false
 YAML;
 
     vfsStream::setup('drupal', NULL, [
@@ -39,6 +42,11 @@ class: \Drupal\Core\ExampleClass
     $yaml_file_loader->load('vfs://drupal/modules/example/example.yml');
 
     $this->assertEquals(['_provider' => [['provider' => 'example']]], $builder->getDefinition('example_service')->getTags());
+    $this->assertTrue($builder->getDefinition('example_service')->isPublic());
+    $this->assertFalse($builder->getDefinition('example_private_service')->isPublic());
+    $builder->compile();
+    $this->assertTrue($builder->has('example_service'));
+    $this->assertFalse($builder->has('example_private_service'));
   }
 
 }
diff --git a/core/tests/Drupal/Tests/Core/Form/EventSubscriber/FormAjaxSubscriberTest.php b/core/tests/Drupal/Tests/Core/Form/EventSubscriber/FormAjaxSubscriberTest.php
index 278ec06416..aa69ad0f0b 100644
--- a/core/tests/Drupal/Tests/Core/Form/EventSubscriber/FormAjaxSubscriberTest.php
+++ b/core/tests/Drupal/Tests/Core/Form/EventSubscriber/FormAjaxSubscriberTest.php
@@ -76,7 +76,8 @@ public function testOnException() {
       ->willReturn($response);
 
     $event = $this->assertResponseFromException($request, $exception, $response);
-    $this->assertSame(200, $event->getResponse()->headers->get('X-Status-Code'));
+    $this->assertTrue($event->isAllowingCustomResponseCode());
+    $this->assertSame(200, $event->getResponse()->getStatusCode());
   }
 
   /**
@@ -100,7 +101,8 @@ public function testOnExceptionNewBuildId() {
       ->willReturn($response);
 
     $event = $this->assertResponseFromException($request, $exception, $response);
-    $this->assertSame(200, $event->getResponse()->headers->get('X-Status-Code'));
+    $this->assertTrue($event->isAllowingCustomResponseCode());
+    $this->assertSame(200, $event->getResponse()->getStatusCode());
   }
 
   /**
@@ -176,9 +178,10 @@ public function testOnExceptionBrokenPostRequest() {
 
     $event = new GetResponseForExceptionEvent($this->httpKernel, $request, HttpKernelInterface::MASTER_REQUEST, $exception);
     $this->subscriber->onException($event);
+    $this->assertTrue($event->isAllowingCustomResponseCode());
     $actual_response = $event->getResponse();
     $this->assertInstanceOf('\Drupal\Core\Ajax\AjaxResponse', $actual_response);
-    $this->assertSame(200, $actual_response->headers->get('X-Status-Code'));
+    $this->assertSame(200, $actual_response->getStatusCode());
     $expected_commands[] = [
       'command' => 'insert',
       'method' => 'prepend',
diff --git a/core/tests/Drupal/Tests/Core/StackMiddleware/ReverseProxyMiddlewareTest.php b/core/tests/Drupal/Tests/Core/StackMiddleware/ReverseProxyMiddlewareTest.php
index b7a784d487..9350327c10 100644
--- a/core/tests/Drupal/Tests/Core/StackMiddleware/ReverseProxyMiddlewareTest.php
+++ b/core/tests/Drupal/Tests/Core/StackMiddleware/ReverseProxyMiddlewareTest.php
@@ -47,6 +47,10 @@ public function testNoProxy() {
    * Tests that subscriber sets trusted headers when reverse proxy is set.
    *
    * @dataProvider reverseProxyEnabledProvider
+   *
+   * @group legacy
+   *
+   * @expectedDeprecation The "Symfony\Component\HttpFoundation\Request::setTrustedHeaderName()" method is deprecated since Symfony 3.3 and will be removed in 4.0. Use the $trustedHeaderSet argument of the Request::setTrustedProxies() method instead.
    */
   public function testReverseProxyEnabled($provided_settings) {
     // Enable reverse proxy and add test values.
@@ -87,10 +91,10 @@ protected function trustedHeadersAreSet(Settings $settings) {
     $request = new Request();
 
     $middleware->handle($request);
-    $this->assertSame($settings->get('reverse_proxy_header'), $request->getTrustedHeaderName($request::HEADER_CLIENT_IP));
-    $this->assertSame($settings->get('reverse_proxy_proto_header'), $request->getTrustedHeaderName($request::HEADER_CLIENT_PROTO));
-    $this->assertSame($settings->get('reverse_proxy_host_header'), $request->getTrustedHeaderName($request::HEADER_CLIENT_HOST));
-    $this->assertSame($settings->get('reverse_proxy_port_header'), $request->getTrustedHeaderName($request::HEADER_CLIENT_PORT));
+    $this->assertSame($settings->get('reverse_proxy_header'), $request->getTrustedHeaderName($request::HEADER_X_FORWARDED_FOR));
+    $this->assertSame($settings->get('reverse_proxy_proto_header'), $request->getTrustedHeaderName($request::HEADER_X_FORWARDED_PROTO));
+    $this->assertSame($settings->get('reverse_proxy_host_header'), $request->getTrustedHeaderName($request::HEADER_X_FORWARDED_HOST));
+    $this->assertSame($settings->get('reverse_proxy_port_header'), $request->getTrustedHeaderName($request::HEADER_X_FORWARDED_PORT));
     $this->assertSame($settings->get('reverse_proxy_forwarded_header'), $request->getTrustedHeaderName($request::HEADER_FORWARDED));
     $this->assertSame($settings->get('reverse_proxy_addresses'), $request->getTrustedProxies());
   }
diff --git a/core/tests/Drupal/Tests/Listeners/DeprecationListenerTrait.php b/core/tests/Drupal/Tests/Listeners/DeprecationListenerTrait.php
index 027ead6c24..97e1112a6d 100644
--- a/core/tests/Drupal/Tests/Listeners/DeprecationListenerTrait.php
+++ b/core/tests/Drupal/Tests/Listeners/DeprecationListenerTrait.php
@@ -279,6 +279,12 @@ public static function getSkippedDeprecations() {
       "The 'rest.entity.workflow.GET.json' route is deprecated since version 8.5.x and will be removed in 9.0.0. Use the 'rest.entity.workflow.GET' route instead.",
       "The 'rest.entity.workflow.GET.xml' route is deprecated since version 8.5.x and will be removed in 9.0.0. Use the 'rest.entity.workflow.GET' route instead.",
       "The 'rest.entity.workflow.GET.hal_json' route is deprecated since version 8.5.x and will be removed in 9.0.0. Use the 'rest.entity.workflow.GET' route instead.",
+      'The Symfony\Component\ClassLoader\ApcClassLoader class is deprecated since Symfony 3.3 and will be removed in 4.0. Use `composer install --apcu-autoloader` instead.',
+      'The Symfony\Component\EventDispatcher\ContainerAwareEventDispatcher class is deprecated since Symfony 3.3 and will be removed in 4.0. Use EventDispatcher with closure factories instead.',
+      'The Symfony\Component\HttpFoundation\Session\Storage\Handler\WriteCheckSessionHandler class is deprecated since Symfony 3.4 and will be removed in 4.0. Implement `SessionUpdateTimestampHandlerInterface` or extend `AbstractSessionHandler` instead.',
+      'The "session_handler.write_check" service relies on the deprecated "Symfony\Component\HttpFoundation\Session\Storage\Handler\WriteCheckSessionHandler" class. It should either be deprecated or its implementation upgraded.',
+      'Not setting the strict option of the Choice constraint to true is deprecated since Symfony 3.4 and will throw an exception in 4.0.',
+      'Using the Yaml::PARSE_KEYS_AS_STRINGS flag is deprecated since Symfony 3.4 as it will be removed in 4.0. Quote your keys when they are evaluable instead.',
     ];
   }
 
diff --git a/sites/default/default.services.yml b/sites/default/default.services.yml
index e1bbbc7e21..dd6d60e54e 100644
--- a/sites/default/default.services.yml
+++ b/sites/default/default.services.yml
@@ -126,15 +126,13 @@ parameters:
   # Not recommended in production environments
   # @default false
   http.response.debug_cacheability_headers: false
-  factory.keyvalue:
-    {}
+  factory.keyvalue: {}
     # Default key/value storage service to use.
     # @default keyvalue.database
     # default: keyvalue.database
     # Collection-specific overrides.
     # state: keyvalue.database
-  factory.keyvalue.expirable:
-    {}
+  factory.keyvalue.expirable: {}
     # Default key/value expirable storage service to use.
     # @default keyvalue.database.expirable
     # default: keyvalue.database.expirable