Update to Drupal 8.1.1. For more information, see https://www.drupal.org/node/2718713

core/lib/Drupal/Core/DependencyInjection/Compiler/ProxyServicesPass.php

@@ -50,7 +50,7 @@ class ProxyServicesPass implements CompilerPassInterface {
             $root_namespace_dir = $namespaces[$root_namespace];
           }
 
-          $message =<<<EOF
+          $message = <<<EOF
 
 Missing proxy class '$proxy_class' for lazy service '$service_id'.
 Use the following command to generate the proxy class:

core/lib/Drupal/Core/DependencyInjection/ContainerBuilder.php

@@ -1,4 +1,5 @@
 <?php
+// @codingStandardsIgnoreFile
 
 namespace Drupal\Core\DependencyInjection;
 

core/lib/Drupal/Core/DependencyInjection/YamlFileLoader.php

@@ -1,4 +1,5 @@
 <?php
+// @codingStandardsIgnoreFile
 
 namespace Drupal\Core\DependencyInjection;