minor #15663 Mark deprecated Twig functions as deprecated with the Tw…

…ig feature (stof)

This PR was merged into the 2.7 branch.

Discussion
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Mark deprecated Twig functions as deprecated with the Twig feature

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | n/a
| License       | MIT
| Doc PR        | n/a

We were not able to trigger the deprecation for ``form_enctype`` because we were trying to trigger it at runtime, and we failed at it.
Twig now has a builtin way to mark functions as deprecated so here is the PR using it.

Commits
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cd167f4 Mark deprecated Twig functions as deprecated with the Twig feature

src/Symfony/Bridge/Twig/AppVariable.php

@@ -14,8 +14,8 @@
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\RequestStack;
 use Symfony\Component\HttpFoundation\Session\Session;
-use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
 use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;
+use Symfony\Component\Security\Core\SecurityContext;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 
 /**

src/Symfony/Bridge/Twig/Extension/AssetExtension.php

@@ -42,7 +42,7 @@ public function getFunctions()
         return array(
             new \Twig_SimpleFunction('asset', array($this, 'getAssetUrl')),
             new \Twig_SimpleFunction('asset_version', array($this, 'getAssetVersion')),
-            new \Twig_SimpleFunction('assets_version', array($this, 'getAssetsVersion')),
+            new \Twig_SimpleFunction('assets_version', array($this, 'getAssetsVersion'), array('deprecated' => true, 'alternative' => 'asset_version')),
         );
     }
 

src/Symfony/Bridge/Twig/Extension/FormExtension.php

@@ -61,7 +61,7 @@ public function getTokenParsers()
     public function getFunctions()
     {
         return array(
-            new \Twig_SimpleFunction('form_enctype', null, array('node_class' => 'Symfony\Bridge\Twig\Node\FormEnctypeNode', 'is_safe' => array('html'))),
+            new \Twig_SimpleFunction('form_enctype', null, array('node_class' => 'Symfony\Bridge\Twig\Node\FormEnctypeNode', 'is_safe' => array('html'), 'deprecated' => true, 'alternative' => 'form_start')),
             new \Twig_SimpleFunction('form_widget', null, array('node_class' => 'Symfony\Bridge\Twig\Node\SearchAndRenderBlockNode', 'is_safe' => array('html'))),
             new \Twig_SimpleFunction('form_errors', null, array('node_class' => 'Symfony\Bridge\Twig\Node\SearchAndRenderBlockNode', 'is_safe' => array('html'))),
             new \Twig_SimpleFunction('form_label', null, array('node_class' => 'Symfony\Bridge\Twig\Node\SearchAndRenderBlockNode', 'is_safe' => array('html'))),