Merge branch '4.0' into 4.1

* 4.0:
  [TwigBundle][DX] Only add the Twig WebLinkExtension if the WebLink component is enabled
  Add note about changed form processing when using PUT requests
  [SecurityBundle] Dont throw if "security.http_utils" is not found
  [Di] Fix undefined variable found by Php Inspections (EA Ultimate)
  [DI] Cleanup unused service_subscriber.locator tag
  [DI] Resolve env placeholder in logs
  The debug class loader is always loaded by Debug::enable().
  [Intl] Update ICU data to 62.1

Author: fabpot

UndefinedCallableHandler.php

@@ -11,6 +11,7 @@
 
 namespace Symfony\Bridge\Twig;
 
+use Symfony\Bundle\FullStack;
 use Twig\Error\SyntaxError;
 
 /**
@@ -56,14 +57,21 @@ class UndefinedCallableHandler
         'workflow_marked_places' => 'workflow',
     );
 
+    private static $fullStackEnable = array(
+        'form' => 'enable "framework.form"',
+        'security-core' => 'add the "SecurityBundle"',
+        'security-http' => 'add the "SecurityBundle"',
+        'web-link' => 'enable "framework.web_link"',
+        'workflow' => 'enable "framework.workflows"',
+    );
+
     public static function onUndefinedFilter($name)
     {
         if (!isset(self::$filterComponents[$name])) {
             return false;
         }
 
-        // Twig will append the source context to the message, so that it will end up being like "[...] Unknown filter "%s" in foo.html.twig on line 123."
-        throw new SyntaxError(sprintf('Did you forget to run "composer require symfony/%s"? Unknown filter "%s".', self::$filterComponents[$name], $name));
+        self::onUndefined($name, 'filter', self::$filterComponents[$name]);
     }
 
     public static function onUndefinedFunction($name)
@@ -72,6 +80,15 @@ public static function onUndefinedFunction($name)
             return false;
         }
 
-        throw new SyntaxError(sprintf('Did you forget to run "composer require symfony/%s"? Unknown function "%s".', self::$functionComponents[$name], $name));
+        self::onUndefined($name, 'function', self::$functionComponents[$name]);
+    }
+
+    private static function onUndefined($name, $type, $component)
+    {
+        if (\class_exists(FullStack::class) && isset(self::$fullStackEnable[$component])) {
+            throw new SyntaxError(sprintf('Did you forget to %s? Unknown %s "%s".', self::$fullStackEnable[$component], $type, $name));
+        }
+
+        throw new SyntaxError(sprintf('Did you forget to run "composer require symfony/%s"? Unknown %s "%s".', $component, $type, $name));
     }
 }