Where did the Twig function "render" disappear in templates?

I just updated my dependencies for my Silex app and now suddenly one of my templates fails with the error:

Twig_Error_Syntax: The function "render" does not exist.

      

        
        
        
      

    

This worked great before I executed composer update

. The composer's output has been updated:

- Removing symfony/options-resolver (v2.6.7)
- Installing symfony/options-resolver (v2.7.0)
  Downloading: 100%

- Removing symfony/intl (v2.6.7)
- Installing symfony/intl (v2.7.0)
  Downloading: 100%

- Removing symfony/form (v2.6.7)
- Installing symfony/form (v2.7.0)
  Downloading: 100%

- Removing symfony/translation (v2.6.7)
- Installing symfony/translation (v2.7.0)
  Downloading: 100%

- Removing symfony/validator (v2.6.7)
- Installing symfony/validator (v2.7.0)
  Downloading: 100%

- Removing symfony/security (v2.6.7)
- Installing symfony/security (v2.7.0)
  Downloading: 100%

- Removing symfony/finder (v2.6.7)
- Installing symfony/finder (v2.7.0)
  Downloading: 100%

- Removing symfony/process (v2.6.7)
- Installing symfony/process (v2.7.0)
  Downloading: 100%

- Removing symfony/twig-bridge (v2.6.7)
- Installing symfony/twig-bridge (v2.7.0)
  Downloading: 100%

- Removing symfony/web-profiler-bundle (v2.6.7)
- Installing symfony/web-profiler-bundle (v2.7.0)
  Downloading: 100%

- Removing symfony/stopwatch (v2.6.7)
- Installing symfony/stopwatch (v2.7.0)
  Downloading: 100%

      

        
        
        
      

    

The code that worked in my template:

{{ render (url('navigation')) | raw }}

      

        
        
        
      

    

I can't find anything that suggests this feature has been deprecated or replaced it. I'm not sure which of the updates caused this issue, but I suspect it's Twig-Bridge. I am using Twig version 1.18.1.

I'm a little bit obsessed with the problem here and it is giving me some trouble, so any help would be great.

I acknowledge the fact that I had to link the version of the packages I am using so that I can test the updates in a more methodical way.

Thanks Russell

Update 1:

Update to provide some more contexts.

composer.json

"require": {
    "silex/silex": "~1.2",
    "silex/web-profiler": "1.0.*@dev",

    "ruflin/elastica": "1.3.*@dev",
    "dflydev/doctrine-orm-service-provider": "1.0.*@dev",

    "monolog/monolog": "1.9.1",

    "twig/twig": "1.18.*@dev",
    "twig/extensions": "1.2.*@dev",

    "symfony/yaml": "~2.4",
    "symfony/console": "~2.4",
    "symfony/twig-bridge": "~2.4",
    "symfony/config": "~2.4",
    "symfony/monolog-bridge": "~2.4",
    "symfony/serializer": "~2.4",
    "symfony/form": "~2.4",
    "symfony/validator": "~2.4",
    "symfony/translation": "~2.4",
    "symfony/security": "~2.4",

    "macedigital/silex-jms-serializer": "1.0.0",
    "jdesrosiers/silex-jms-serializer-provider": "~0.1",

    "mheap/silex-gravatar": "dev-master",
    "mheap/gravatar-php": "dev-master",
    "mheap/silex-assetic": "1.0.4",

    "knplabs/knp-menu": "2.0.*@dev",

    "predis/service-provider": "dev-master",

    "pear/archive_tar": "dev-master",
    "pear/pear_exception": "1.0.*@dev",
    "wapmorgan/unified-archive": "dev-master",

    "sybio/image-workshop": "dev-master",
    "sybio/gif-frame-extractor": "dev-master",
    "sybio/gif-creator": "dev-master",

    "paypal/rest-api-sdk-php" : "*",

    "kilte/silex-pagination": "1.1.*@dev",

    "thispagecannotbefound/silex-markdown-parser": "dev-master",

    "erusev/parsedown": "~1.4",
    "erusev/parsedown-extra": "dev-master"
 }

      

        
        
        
      

    

I register Twig and UrlGenerator services using the following:

$app->register ( new \Silex\Provider\UrlGeneratorServiceProvider () );
$app -> register (new \Silex\Provider\TwigServiceProvider(), array(
        'twig.options' => array("debug" => true)
    ));

$app['twig'] = $app -> share($app -> extend('twig', function($twig, $app) {
        $twig -> addExtension(new \Twig_Extension_Debug());
        return $twig;
    }));

      

        
        
        
      

    

The twig itself still works, and any template that doesn't have {{render}} in it will work without issue.