diff --git a/UPGRADE-2.7.md b/UPGRADE-2.7.md
index 5de67ebede..1cf3d3df7f 100644
--- a/UPGRADE-2.7.md
+++ b/UPGRADE-2.7.md
@@ -40,7 +40,7 @@ Form
 ----
 
  * In form types and extension overriding the "setDefaultOptions" of the
-   AbstractType or AbstractExtensionType has been deprecated in favor of
+   AbstractType or AbstractTypeExtension has been deprecated in favor of
    overriding the new "configureOptions" method.
 
    The method "setDefaultOptions(OptionsResolverInterface $resolver)" will
diff --git a/src/Symfony/Bridge/Twig/Tests/Extension/TranslationExtensionTest.php b/src/Symfony/Bridge/Twig/Tests/Extension/TranslationExtensionTest.php
index 0235c4da32..e96bd4f9a3 100644
--- a/src/Symfony/Bridge/Twig/Tests/Extension/TranslationExtensionTest.php
+++ b/src/Symfony/Bridge/Twig/Tests/Extension/TranslationExtensionTest.php
@@ -36,7 +36,7 @@ class TranslationExtensionTest extends \PHPUnit_Framework_TestCase
             $twig = new \Twig_Environment($loader, array('debug' => true, 'cache' => false));
             $twig->addExtension(new TranslationExtension(new Translator('en', new MessageSelector())));
 
-            echo $twig->compile($twig->parse($twig->tokenize(new \Twig_Source($twig->getLoader()->getSource('index'), 'index'))))."\n\n";
+            echo $twig->compile($twig->parse($twig->tokenize($twig->getLoader()->getSourceContext('index'))))."\n\n";
             $this->assertEquals($expected, $this->getTemplate($template)->render($variables));
         }
 
diff --git a/src/Symfony/Bridge/Twig/TwigEngine.php b/src/Symfony/Bridge/Twig/TwigEngine.php
index 3e3257e7fa..1ac9d0102e 100644
--- a/src/Symfony/Bridge/Twig/TwigEngine.php
+++ b/src/Symfony/Bridge/Twig/TwigEngine.php
@@ -75,14 +75,14 @@ class TwigEngine implements EngineInterface, StreamingEngineInterface
 
         $loader = $this->environment->getLoader();
 
-        if ($loader instanceof \Twig_ExistsLoaderInterface) {
+        if ($loader instanceof \Twig_ExistsLoaderInterface || method_exists($loader, 'exists')) {
             return $loader->exists((string) $name);
         }
 
         try {
             // cast possible TemplateReferenceInterface to string because the
             // EngineInterface supports them but Twig_LoaderInterface does not
-            $loader->getSource((string) $name);
+            $loader->getSourceContext((string) $name)->getCode();
         } catch (\Twig_Error_Loader $e) {
             return false;
         }
diff --git a/src/Symfony/Bundle/FrameworkBundle/Command/TranslationUpdateCommand.php b/src/Symfony/Bundle/FrameworkBundle/Command/TranslationUpdateCommand.php
index 64874e70ef..72298480b4 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Command/TranslationUpdateCommand.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Command/TranslationUpdateCommand.php
@@ -119,9 +119,8 @@ EOF
         // load any messages from templates
         $extractedCatalogue = new MessageCatalogue($input->getArgument('locale'));
         $io->comment('Parsing templates...');
-        $prefix = $input->getOption('prefix');
         $extractor = $this->getContainer()->get('translation.extractor');
-        $extractor->setPrefix(null === $prefix ? '' : $prefix);
+        $extractor->setPrefix($input->getOption('prefix'));
         foreach ($transPaths as $path) {
             $path .= 'views';
             if (is_dir($path)) {
diff --git a/src/Symfony/Bundle/TwigBundle/Controller/ExceptionController.php b/src/Symfony/Bundle/TwigBundle/Controller/ExceptionController.php
index 47bb19380d..1fcfbd9402 100644
--- a/src/Symfony/Bundle/TwigBundle/Controller/ExceptionController.php
+++ b/src/Symfony/Bundle/TwigBundle/Controller/ExceptionController.php
@@ -129,12 +129,12 @@ class ExceptionController
         $template = (string) $template;
 
         $loader = $this->twig->getLoader();
-        if ($loader instanceof \Twig_ExistsLoaderInterface) {
+        if ($loader instanceof \Twig_ExistsLoaderInterface || method_exists($loader, 'exists')) {
             return $loader->exists($template);
         }
 
         try {
-            $loader->getSource($template);
+            $loader->getSourceContext($template)->getCode();
 
             return true;
         } catch (\Twig_Error_Loader $e) {
diff --git a/src/Symfony/Component/HttpFoundation/RequestMatcher.php b/src/Symfony/Component/HttpFoundation/RequestMatcher.php
index ca094ca162..aa4f67b58b 100644
--- a/src/Symfony/Component/HttpFoundation/RequestMatcher.php
+++ b/src/Symfony/Component/HttpFoundation/RequestMatcher.php
@@ -19,22 +19,22 @@ namespace Symfony\Component\HttpFoundation;
 class RequestMatcher implements RequestMatcherInterface
 {
     /**
-     * @var string
+     * @var string|null
      */
     private $path;
 
     /**
-     * @var string
+     * @var string|null
      */
     private $host;
 
     /**
-     * @var array
+     * @var string[]
      */
     private $methods = array();
 
     /**
-     * @var string
+     * @var string[]
      */
     private $ips = array();
 
@@ -76,13 +76,13 @@ class RequestMatcher implements RequestMatcherInterface
      */
     public function matchScheme($scheme)
     {
-        $this->schemes = array_map('strtolower', (array) $scheme);
+        $this->schemes = null !== $scheme ? array_map('strtolower', (array) $scheme) : array();
     }
 
     /**
      * Adds a check for the URL host name.
      *
-     * @param string $regexp A Regexp
+     * @param string|null $regexp A Regexp
      */
     public function matchHost($regexp)
     {
@@ -92,7 +92,7 @@ class RequestMatcher implements RequestMatcherInterface
     /**
      * Adds a check for the URL path info.
      *
-     * @param string $regexp A Regexp
+     * @param string|null $regexp A Regexp
      */
     public function matchPath($regexp)
     {
@@ -112,21 +112,21 @@ class RequestMatcher implements RequestMatcherInterface
     /**
      * Adds a check for the client IP.
      *
-     * @param string|string[] $ips A specific IP address or a range specified using IP/netmask like 192.168.1.0/24
+     * @param string|string[]|null $ips A specific IP address or a range specified using IP/netmask like 192.168.1.0/24
      */
     public function matchIps($ips)
     {
-        $this->ips = (array) $ips;
+        $this->ips = null !== $ips ? (array) $ips : array();
     }
 
     /**
      * Adds a check for the HTTP method.
      *
-     * @param string|string[] $method An HTTP method or an array of HTTP methods
+     * @param string|string[]|null $method An HTTP method or an array of HTTP methods
      */
     public function matchMethod($method)
     {
-        $this->methods = array_map('strtoupper', (array) $method);
+        $this->methods = null !== $method ? array_map('strtoupper', (array) $method) : array();
     }
 
     /**
@@ -145,11 +145,11 @@ class RequestMatcher implements RequestMatcherInterface
      */
     public function matches(Request $request)
     {
-        if ($this->schemes && !in_array($request->getScheme(), $this->schemes)) {
+        if ($this->schemes && !in_array($request->getScheme(), $this->schemes, true)) {
             return false;
         }
 
-        if ($this->methods && !in_array($request->getMethod(), $this->methods)) {
+        if ($this->methods && !in_array($request->getMethod(), $this->methods, true)) {
             return false;
         }
 
diff --git a/src/Symfony/Component/HttpKernel/Fragment/HIncludeFragmentRenderer.php b/src/Symfony/Component/HttpKernel/Fragment/HIncludeFragmentRenderer.php
index 56c96b3ced..27051cfb77 100644
--- a/src/Symfony/Component/HttpKernel/Fragment/HIncludeFragmentRenderer.php
+++ b/src/Symfony/Component/HttpKernel/Fragment/HIncludeFragmentRenderer.php
@@ -140,12 +140,16 @@ class HIncludeFragmentRenderer extends RoutableFragmentRenderer
         }
 
         $loader = $this->templating->getLoader();
-        if ($loader instanceof \Twig_ExistsLoaderInterface) {
+        if ($loader instanceof \Twig_ExistsLoaderInterface || method_exists($loader, 'exists')) {
             return $loader->exists($template);
         }
 
         try {
-            $loader->getSource($template);
+            if (method_exists($loader, 'getSourceContext')) {
+                $loader->getSourceContext($template);
+            } else {
+                $loader->getSource($template);
+            }
 
             return true;
         } catch (\Twig_Error_Loader $e) {