diff --git a/UPGRADE-3.0.md b/UPGRADE-3.0.md
index fc81eae24f..a93cfbf2f0 100644
--- a/UPGRADE-3.0.md
+++ b/UPGRADE-3.0.md
@@ -1902,5 +1902,5 @@ UPGRADE FROM 2.x to 3.0
    After:
 
    ```php
-   $request->query->get('foo')[bar];
+   $request->query->get('foo')['bar'];
    ```
diff --git a/src/Symfony/Bridge/Twig/Tests/Node/DumpNodeTest.php b/src/Symfony/Bridge/Twig/Tests/Node/DumpNodeTest.php
index 8e5b933c81..5d669cde7a 100644
--- a/src/Symfony/Bridge/Twig/Tests/Node/DumpNodeTest.php
+++ b/src/Symfony/Bridge/Twig/Tests/Node/DumpNodeTest.php
@@ -80,7 +80,12 @@ if ($this->env->isDebug()) {
 }
 
 EOTXT;
-        $expected = preg_replace('/%(.*?)%/', '(isset($context["$1"]) ? $context["$1"] : null)', $expected);
+
+        if (PHP_VERSION_ID >= 70000) {
+            $expected = preg_replace('/%(.*?)%/', '($context["$1"] ?? null)', $expected);
+        } else {
+            $expected = preg_replace('/%(.*?)%/', '(isset($context["$1"]) ? $context["$1"] : null)', $expected);
+        }
 
         $this->assertSame($expected, $compiler->compile($node)->getSource());
     }
@@ -106,7 +111,12 @@ if ($this->env->isDebug()) {
 }
 
 EOTXT;
-        $expected = preg_replace('/%(.*?)%/', '(isset($context["$1"]) ? $context["$1"] : null)', $expected);
+
+        if (PHP_VERSION_ID >= 70000) {
+            $expected = preg_replace('/%(.*?)%/', '($context["$1"] ?? null)', $expected);
+        } else {
+            $expected = preg_replace('/%(.*?)%/', '(isset($context["$1"]) ? $context["$1"] : null)', $expected);
+        }
 
         $this->assertSame($expected, $compiler->compile($node)->getSource());
     }
diff --git a/src/Symfony/Bridge/Twig/Tests/Node/FormThemeTest.php b/src/Symfony/Bridge/Twig/Tests/Node/FormThemeTest.php
index 52d79eb612..ce0eade671 100644
--- a/src/Symfony/Bridge/Twig/Tests/Node/FormThemeTest.php
+++ b/src/Symfony/Bridge/Twig/Tests/Node/FormThemeTest.php
@@ -66,6 +66,10 @@ class FormThemeTest extends \PHPUnit_Framework_TestCase
 
     protected function getVariableGetter($name)
     {
+        if (PHP_VERSION_ID >= 70000) {
+            return sprintf('($context["%s"] ?? null)', $name, $name);
+        }
+
         return sprintf('(isset($context["%s"]) ? $context["%s"] : null)', $name, $name);
     }
 }
diff --git a/src/Symfony/Bridge/Twig/Tests/Node/SearchAndRenderBlockNodeTest.php b/src/Symfony/Bridge/Twig/Tests/Node/SearchAndRenderBlockNodeTest.php
index 599f2c8c34..3cf2ceb5a2 100644
--- a/src/Symfony/Bridge/Twig/Tests/Node/SearchAndRenderBlockNodeTest.php
+++ b/src/Symfony/Bridge/Twig/Tests/Node/SearchAndRenderBlockNodeTest.php
@@ -263,6 +263,10 @@ class SearchAndRenderBlockNodeTest extends \PHPUnit_Framework_TestCase
 
     protected function getVariableGetter($name)
     {
+        if (PHP_VERSION_ID >= 70000) {
+            return sprintf('($context["%s"] ?? null)', $name, $name);
+        }
+
         return sprintf('(isset($context["%s"]) ? $context["%s"] : null)', $name, $name);
     }
 }
diff --git a/src/Symfony/Bridge/Twig/Tests/Node/TransNodeTest.php b/src/Symfony/Bridge/Twig/Tests/Node/TransNodeTest.php
index 9798e6ddf4..4c00cdab50 100644
--- a/src/Symfony/Bridge/Twig/Tests/Node/TransNodeTest.php
+++ b/src/Symfony/Bridge/Twig/Tests/Node/TransNodeTest.php
@@ -39,15 +39,23 @@ class TransNodeTest extends \PHPUnit_Framework_TestCase
 
     protected function getVariableGetterWithoutStrictCheck($name)
     {
+        if (PHP_VERSION_ID >= 70000) {
+            return sprintf('($context["%s"] ?? null)', $name, $name);
+        }
+
         return sprintf('(isset($context["%s"]) ? $context["%s"] : null)', $name, $name);
     }
 
     protected function getVariableGetterWithStrictCheck($name)
     {
-        if (version_compare(\Twig_Environment::VERSION, '2.0.0-DEV', '>=')) {
+        if (\Twig_Environment::MAJOR_VERSION >= 2) {
             return sprintf('(isset($context["%s"]) || array_key_exists("%s", $context) ? $context["%s"] : $this->notFound("%s", 0))', $name, $name, $name, $name);
         }
 
-        return sprintf('(isset($context["%1$s"]) ? $context["%1$s"] : $this->getContext($context, "%1$s"))', $name);
+        if (PHP_VERSION_ID >= 70000) {
+            return sprintf('($context["%s"] ?? $this->getContext($context, "%s"))', $name, $name, $name);
+        }
+
+        return sprintf('(isset($context["%s"]) ? $context["%s"] : $this->getContext($context, "%s"))', $name, $name, $name);
     }
 }
diff --git a/src/Symfony/Bridge/Twig/composer.json b/src/Symfony/Bridge/Twig/composer.json
index f61a045f57..c38a72d378 100644
--- a/src/Symfony/Bridge/Twig/composer.json
+++ b/src/Symfony/Bridge/Twig/composer.json
@@ -17,7 +17,7 @@
     ],
     "require": {
         "php": ">=5.5.9",
-        "twig/twig": "~1.27|~2.0"
+        "twig/twig": "~1.28|~2.0"
     },
     "require-dev": {
         "symfony/asset": "~2.8|~3.0",
diff --git a/src/Symfony/Bundle/FrameworkBundle/Command/TranslationDebugCommand.php b/src/Symfony/Bundle/FrameworkBundle/Command/TranslationDebugCommand.php
index f5cd62938f..3f0f2908a5 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Command/TranslationDebugCommand.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Command/TranslationDebugCommand.php
@@ -21,6 +21,8 @@ use Symfony\Component\HttpKernel\Kernel;
 use Symfony\Component\Translation\Catalogue\MergeOperation;
 use Symfony\Component\Translation\MessageCatalogue;
 use Symfony\Component\Translation\Translator;
+use Symfony\Component\Translation\DataCollectorTranslator;
+use Symfony\Component\Translation\LoggingTranslator;
 
 /**
  * Helps finding unused or missing translation messages in a given locale
@@ -295,7 +297,7 @@ EOF
     {
         $fallbackCatalogues = array();
         $translator = $this->getContainer()->get('translator');
-        if ($translator instanceof Translator) {
+        if ($translator instanceof Translator || $translator instanceof DataCollectorTranslator || $translator instanceof LoggingTranslator) {
             foreach ($translator->getFallbackLocales() as $fallbackLocale) {
                 if ($fallbackLocale === $locale) {
                     continue;
diff --git a/src/Symfony/Component/Console/Command/Command.php b/src/Symfony/Component/Console/Command/Command.php
index 0d5001bb18..c3a5aa2d0d 100644
--- a/src/Symfony/Component/Console/Command/Command.php
+++ b/src/Symfony/Component/Console/Command/Command.php
@@ -202,8 +202,6 @@ class Command
      *
      * @return int The command exit code
      *
-     * @throws \Exception
-     *
      * @see setCode()
      * @see execute()
      */
diff --git a/src/Symfony/Component/DomCrawler/FormFieldRegistry.php b/src/Symfony/Component/DomCrawler/FormFieldRegistry.php
index dbd08ff720..7dd3d3e7a3 100644
--- a/src/Symfony/Component/DomCrawler/FormFieldRegistry.php
+++ b/src/Symfony/Component/DomCrawler/FormFieldRegistry.php
@@ -15,6 +15,8 @@ use Symfony\Component\DomCrawler\Field\FormField;
 
 /**
  * This is an internal class that must not be used directly.
+ *
+ * @internal
  */
 class FormFieldRegistry
 {
diff --git a/src/Symfony/Component/Form/Extension/Core/Type/TimeType.php b/src/Symfony/Component/Form/Extension/Core/Type/TimeType.php
index 60fbeb5826..4ba23a8c8b 100644
--- a/src/Symfony/Component/Form/Extension/Core/Type/TimeType.php
+++ b/src/Symfony/Component/Form/Extension/Core/Type/TimeType.php
@@ -12,6 +12,8 @@
 namespace Symfony\Component\Form\Extension\Core\Type;
 
 use Symfony\Component\Form\AbstractType;
+use Symfony\Component\Form\FormEvent;
+use Symfony\Component\Form\FormEvents;
 use Symfony\Component\Form\FormInterface;
 use Symfony\Component\Form\FormBuilderInterface;
 use Symfony\Component\Form\ReversedTransformer;
@@ -54,6 +56,17 @@ class TimeType extends AbstractType
 
         if ('single_text' === $options['widget']) {
             $builder->addViewTransformer(new DateTimeToStringTransformer($options['model_timezone'], $options['view_timezone'], $format));
+
+            // handle seconds ignored by user's browser when with_seconds enabled
+            // https://codereview.chromium.org/450533009/
+            if ($options['with_seconds']) {
+                $builder->addEventListener(FormEvents::PRE_SUBMIT, function (FormEvent $e) {
+                    $data = $e->getData();
+                    if ($data && preg_match('/^\d{2}:\d{2}$/', $data)) {
+                        $e->setData($data.':00');
+                    }
+                });
+            }
         } else {
             $hourOptions = $minuteOptions = $secondOptions = array(
                 'error_bubbling' => true,
diff --git a/src/Symfony/Component/Form/Tests/Extension/Core/Type/TimeTypeTest.php b/src/Symfony/Component/Form/Tests/Extension/Core/Type/TimeTypeTest.php
index 7e10d326f8..ccd0011f09 100644
--- a/src/Symfony/Component/Form/Tests/Extension/Core/Type/TimeTypeTest.php
+++ b/src/Symfony/Component/Form/Tests/Extension/Core/Type/TimeTypeTest.php
@@ -221,6 +221,22 @@ class TimeTypeTest extends TestCase
         $this->assertEquals('03', $form->getViewData());
     }
 
+    public function testSubmitWithSecondsAndBrowserOmissionSeconds()
+    {
+        $form = $this->factory->create('time', null, array(
+            'model_timezone' => 'UTC',
+            'view_timezone' => 'UTC',
+            'input' => 'string',
+            'widget' => 'single_text',
+            'with_seconds' => true,
+        ));
+
+        $form->submit('03:04');
+
+        $this->assertEquals('03:04:00', $form->getData());
+        $this->assertEquals('03:04:00', $form->getViewData());
+    }
+
     public function testSetDataWithoutMinutes()
     {
         $form = $this->factory->create('Symfony\Component\Form\Extension\Core\Type\TimeType', null, array(
diff --git a/src/Symfony/Component/Translation/DataCollectorTranslator.php b/src/Symfony/Component/Translation/DataCollectorTranslator.php
index 2446723358..50e4a2ff93 100644
--- a/src/Symfony/Component/Translation/DataCollectorTranslator.php
+++ b/src/Symfony/Component/Translation/DataCollectorTranslator.php
@@ -88,6 +88,20 @@ class DataCollectorTranslator implements TranslatorInterface, TranslatorBagInter
         return $this->translator->getCatalogue($locale);
     }
 
+    /**
+     * Gets the fallback locales.
+     *
+     * @return array $locales The fallback locales
+     */
+    public function getFallbackLocales()
+    {
+        if ($this->translator instanceof Translator) {
+            return $this->translator->getFallbackLocales();
+        }
+
+        return array();
+    }
+
     /**
      * Passes through all unknown calls onto the translator object.
      */
diff --git a/src/Symfony/Component/Translation/LoggingTranslator.php b/src/Symfony/Component/Translation/LoggingTranslator.php
index fa5c5cc5b5..b259df5e0a 100644
--- a/src/Symfony/Component/Translation/LoggingTranslator.php
+++ b/src/Symfony/Component/Translation/LoggingTranslator.php
@@ -88,6 +88,20 @@ class LoggingTranslator implements TranslatorInterface, TranslatorBagInterface
         return $this->translator->getCatalogue($locale);
     }
 
+    /**
+     * Gets the fallback locales.
+     *
+     * @return array $locales The fallback locales
+     */
+    public function getFallbackLocales()
+    {
+        if ($this->translator instanceof Translator) {
+            return $this->translator->getFallbackLocales();
+        }
+
+        return array();
+    }
+
     /**
      * Passes through all unknown calls onto the translator object.
      */
diff --git a/src/Symfony/Component/Translation/Tests/TranslatorTest.php b/src/Symfony/Component/Translation/Tests/TranslatorTest.php
index 0f65d3e5ef..389f3e6e78 100644
--- a/src/Symfony/Component/Translation/Tests/TranslatorTest.php
+++ b/src/Symfony/Component/Translation/Tests/TranslatorTest.php
@@ -273,6 +273,16 @@ class TranslatorTest extends \PHPUnit_Framework_TestCase
         $translator->trans('foo');
     }
 
+    public function testNestedFallbackCatalogueWhenUsingMultipleLocales()
+    {
+        $translator = new Translator('fr');
+        $translator->setFallbackLocales(array('ru', 'en'));
+
+        $translator->getCatalogue('fr');
+
+        $this->assertNotNull($translator->getCatalogue('ru')->getFallbackCatalogue());
+    }
+
     public function testFallbackCatalogueResources()
     {
         $translator = new Translator('en_GB', new MessageSelector());
diff --git a/src/Symfony/Component/Translation/Translator.php b/src/Symfony/Component/Translation/Translator.php
index df0ef65ba1..62deed8672 100644
--- a/src/Symfony/Component/Translation/Translator.php
+++ b/src/Symfony/Component/Translation/Translator.php
@@ -380,7 +380,7 @@ EOF
 
         foreach ($this->computeFallbackLocales($locale) as $fallback) {
             if (!isset($this->catalogues[$fallback])) {
-                $this->doLoadCatalogue($fallback);
+                $this->loadCatalogue($fallback);
             }
 
             $fallbackCatalogue = new MessageCatalogue($fallback, $this->catalogues[$fallback]->all());
diff --git a/src/Symfony/Component/Validator/Resources/translations/validators.sv.xlf b/src/Symfony/Component/Validator/Resources/translations/validators.sv.xlf
index 693f12b5b1..879c0a5c55 100644
--- a/src/Symfony/Component/Validator/Resources/translations/validators.sv.xlf
+++ b/src/Symfony/Component/Validator/Resources/translations/validators.sv.xlf
@@ -310,6 +310,10 @@
                 <source>This value does not match the expected {{ charset }} charset.</source>
                 <target>Detta värde har inte den förväntade teckenkodningen {{ charset }}.</target>
             </trans-unit>
+            <trans-unit id="81">
+                <source>This is not a valid Business Identifier Code (BIC).</source>
+                <target>Detta är inte en giltig BIC-kod.</target>
+            </trans-unit>
         </body>
     </file>
 </xliff>
diff --git a/src/Symfony/Component/Yaml/Inline.php b/src/Symfony/Component/Yaml/Inline.php
index 5e991362a8..9169c592b8 100644
--- a/src/Symfony/Component/Yaml/Inline.php
+++ b/src/Symfony/Component/Yaml/Inline.php
@@ -30,13 +30,13 @@ class Inline
     private static $objectForMap = false;
 
     /**
-     * Converts a YAML string to a PHP array.
+     * Converts a YAML string to a PHP value.
      *
      * @param string $value      A YAML string
      * @param int    $flags      A bit field of PARSE_* constants to customize the YAML parser behavior
      * @param array  $references Mapping of variable names to values
      *
-     * @return array A PHP array representing the YAML string
+     * @return mixed A PHP value
      *
      * @throws ParseException
      */
@@ -121,7 +121,7 @@ class Inline
      * @param mixed $value The PHP variable to convert
      * @param int   $flags A bit field of Yaml::DUMP_* constants to customize the dumped YAML string
      *
-     * @return string The YAML string representing the PHP array
+     * @return string The YAML string representing the PHP value
      *
      * @throws DumpException When trying to dump PHP resource
      */
@@ -266,7 +266,7 @@ class Inline
     }
 
     /**
-     * Parses a scalar to a YAML string.
+     * Parses a YAML scalar.
      *
      * @param string $scalar
      * @param int    $flags
@@ -276,7 +276,7 @@ class Inline
      * @param bool   $evaluate
      * @param array  $references
      *
-     * @return string A YAML string
+     * @return string
      *
      * @throws ParseException When malformed inline YAML string is parsed
      *
@@ -329,12 +329,12 @@ class Inline
     }
 
     /**
-     * Parses a quoted scalar to YAML.
+     * Parses a YAML quoted scalar.
      *
      * @param string $scalar
      * @param int    &$i
      *
-     * @return string A YAML string
+     * @return string
      *
      * @throws ParseException When malformed inline YAML string is parsed
      */
@@ -359,14 +359,14 @@ class Inline
     }
 
     /**
-     * Parses a sequence to a YAML string.
+     * Parses a YAML sequence.
      *
      * @param string $sequence
      * @param int    $flags
      * @param int    &$i
      * @param array  $references
      *
-     * @return string A YAML string
+     * @return array
      *
      * @throws ParseException When malformed inline YAML string is parsed
      */
@@ -419,14 +419,14 @@ class Inline
     }
 
     /**
-     * Parses a mapping to a YAML string.
+     * Parses a YAML mapping.
      *
      * @param string $mapping
      * @param int    $flags
      * @param int    &$i
      * @param array  $references
      *
-     * @return string A YAML string
+     * @return array|\stdClass
      *
      * @throws ParseException When malformed inline YAML string is parsed
      */