diff --git a/src/Symfony/Bridge/Twig/CHANGELOG.md b/src/Symfony/Bridge/Twig/CHANGELOG.md
index 3aa0183fab..65246534c5 100644
--- a/src/Symfony/Bridge/Twig/CHANGELOG.md
+++ b/src/Symfony/Bridge/Twig/CHANGELOG.md
@@ -5,6 +5,7 @@ CHANGELOG
 -----
 
  * removed `TwigEngine` class, use `\Twig\Environment` instead.
+ * removed `transChoice` filter and token
 
 4.4.0
 -----
diff --git a/src/Symfony/Bridge/Twig/Extension/TranslationExtension.php b/src/Symfony/Bridge/Twig/Extension/TranslationExtension.php
index 9e927ecdf0..163d5d5635 100644
--- a/src/Symfony/Bridge/Twig/Extension/TranslationExtension.php
+++ b/src/Symfony/Bridge/Twig/Extension/TranslationExtension.php
@@ -13,10 +13,8 @@ namespace Symfony\Bridge\Twig\Extension;
 
 use Symfony\Bridge\Twig\NodeVisitor\TranslationDefaultDomainNodeVisitor;
 use Symfony\Bridge\Twig\NodeVisitor\TranslationNodeVisitor;
-use Symfony\Bridge\Twig\TokenParser\TransChoiceTokenParser;
 use Symfony\Bridge\Twig\TokenParser\TransDefaultDomainTokenParser;
 use Symfony\Bridge\Twig\TokenParser\TransTokenParser;
-use Symfony\Component\Translation\TranslatorInterface as LegacyTranslatorInterface;
 use Symfony\Contracts\Translation\TranslatorInterface;
 use Symfony\Contracts\Translation\TranslatorTrait;
 use Twig\Extension\AbstractExtension;
@@ -36,14 +34,8 @@ class TranslationExtension extends AbstractExtension
     private $translator;
     private $translationNodeVisitor;
 
-    /**
-     * @param TranslatorInterface|null $translator
-     */
-    public function __construct($translator = null, NodeVisitorInterface $translationNodeVisitor = null)
+    public function __construct(TranslatorInterface $translator = null, NodeVisitorInterface $translationNodeVisitor = null)
     {
-        if (null !== $translator && !$translator instanceof LegacyTranslatorInterface && !$translator instanceof TranslatorInterface) {
-            throw new \TypeError(sprintf('Argument 1 passed to %s() must be an instance of %s, %s given.', __METHOD__, TranslatorInterface::class, \is_object($translator) ? \get_class($translator) : \gettype($translator)));
-        }
         $this->translator = $translator;
         $this->translationNodeVisitor = $translationNodeVisitor;
     }
@@ -73,7 +65,6 @@ class TranslationExtension extends AbstractExtension
     {
         return [
             new TwigFilter('trans', [$this, 'trans']),
-            new TwigFilter('transchoice', [$this, 'transchoice'], ['deprecated' => '4.2', 'alternative' => 'trans" with parameter "%count%']),
         ];
     }
 
@@ -88,11 +79,6 @@ class TranslationExtension extends AbstractExtension
             // {% trans %}Symfony is great!{% endtrans %}
             new TransTokenParser(),
 
-            // {% transchoice count %}
-            //     {0} There is no apples|{1} There is one apple|]1,Inf] There is {{ count }} apples
-            // {% endtranschoice %}
-            new TransChoiceTokenParser(),
-
             // {% trans_default_domain "foobar" %}
             new TransDefaultDomainTokenParser(),
         ];
@@ -120,20 +106,6 @@ class TranslationExtension extends AbstractExtension
         return $this->getTranslator()->trans($message, $arguments, $domain, $locale);
     }
 
-    /**
-     * @deprecated since Symfony 4.2, use the trans() method instead with a %count% parameter
-     */
-    public function transchoice($message, $count, array $arguments = [], $domain = null, $locale = null)
-    {
-        $translator = $this->getTranslator();
-
-        if ($translator instanceof TranslatorInterface) {
-            return $translator->trans($message, array_merge(['%count%' => $count], $arguments), $domain, $locale);
-        }
-
-        return $translator->transChoice($message, $count, array_merge(['%count%' => $count], $arguments), $domain, $locale);
-    }
-
     /**
      * {@inheritdoc}
      */
diff --git a/src/Symfony/Bridge/Twig/Node/TransNode.php b/src/Symfony/Bridge/Twig/Node/TransNode.php
index cedc6b740e..e844801a5f 100644
--- a/src/Symfony/Bridge/Twig/Node/TransNode.php
+++ b/src/Symfony/Bridge/Twig/Node/TransNode.php
@@ -57,8 +57,6 @@ class TransNode extends Node
         }
         list($msg, $defaults) = $this->compileString($this->getNode('body'), $defaults, (bool) $vars);
 
-        $method = !$this->hasNode('count') ? 'trans' : 'transChoice';
-
         $compiler
             ->write('echo $this->env->getExtension(\'Symfony\Bridge\Twig\Extension\TranslationExtension\')->trans(')
             ->subcompile($msg)
diff --git a/src/Symfony/Bridge/Twig/Tests/Extension/TranslationExtensionTest.php b/src/Symfony/Bridge/Twig/Tests/Extension/TranslationExtensionTest.php
index de85603a53..1757acacdd 100644
--- a/src/Symfony/Bridge/Twig/Tests/Extension/TranslationExtensionTest.php
+++ b/src/Symfony/Bridge/Twig/Tests/Extension/TranslationExtensionTest.php
@@ -45,15 +45,6 @@ class TranslationExtensionTest extends TestCase
         $this->assertEquals($expected, $this->getTemplate($template)->render($variables));
     }
 
-    /**
-     * @group legacy
-     * @dataProvider getTransChoiceTests
-     */
-    public function testTransChoice($template, $expected, array $variables = [])
-    {
-        $this->testTrans($template, $expected, $variables);
-    }
-
     /**
      * @expectedException        \Twig\Error\SyntaxError
      * @expectedExceptionMessage Unexpected token. Twig was looking for the "with", "from", or "into" keyword in "index" at line 3.
@@ -72,16 +63,6 @@ class TranslationExtensionTest extends TestCase
         $output = $this->getTemplate("{% trans %}\n{{ 1 + 2 }}{% endtrans %}")->render();
     }
 
-    /**
-     * @group legacy
-     * @expectedException        \Twig\Error\SyntaxError
-     * @expectedExceptionMessage A message inside a transchoice tag must be a simple text in "index" at line 2.
-     */
-    public function testTransChoiceComplexBody()
-    {
-        $output = $this->getTemplate("{% transchoice count %}\n{{ 1 + 2 }}{% endtranschoice %}")->render();
-    }
-
     public function getTransTests()
     {
         return [
@@ -142,69 +123,6 @@ class TranslationExtensionTest extends TestCase
         ];
     }
 
-    /**
-     * @group legacy
-     */
-    public function getTransChoiceTests()
-    {
-        return [
-            // trans tag
-            ['{% trans %}Hello{% endtrans %}', 'Hello'],
-            ['{% trans %}%name%{% endtrans %}', 'Symfony', ['name' => 'Symfony']],
-
-            ['{% trans from elsewhere %}Hello{% endtrans %}', 'Hello'],
-
-            ['{% trans %}Hello %name%{% endtrans %}', 'Hello Symfony', ['name' => 'Symfony']],
-            ['{% trans with { \'%name%\': \'Symfony\' } %}Hello %name%{% endtrans %}', 'Hello Symfony'],
-            ['{% set vars = { \'%name%\': \'Symfony\' } %}{% trans with vars %}Hello %name%{% endtrans %}', 'Hello Symfony'],
-
-            ['{% trans into "fr"%}Hello{% endtrans %}', 'Hello'],
-
-            // transchoice
-            [
-                '{% transchoice count from "messages" %}{0} There is no apples|{1} There is one apple|]1,Inf] There is %count% apples{% endtranschoice %}',
-                'There is no apples',
-                ['count' => 0],
-            ],
-            [
-                '{% transchoice count %}{0} There is no apples|{1} There is one apple|]1,Inf] There is %count% apples{% endtranschoice %}',
-                'There is 5 apples',
-                ['count' => 5],
-            ],
-            [
-                '{% transchoice count %}{0} There is no apples|{1} There is one apple|]1,Inf] There is %count% apples (%name%){% endtranschoice %}',
-                'There is 5 apples (Symfony)',
-                ['count' => 5, 'name' => 'Symfony'],
-            ],
-            [
-                '{% transchoice count with { \'%name%\': \'Symfony\' } %}{0} There is no apples|{1} There is one apple|]1,Inf] There is %count% apples (%name%){% endtranschoice %}',
-                'There is 5 apples (Symfony)',
-                ['count' => 5],
-            ],
-            [
-                '{% transchoice count into "fr"%}{0} There is no apples|{1} There is one apple|]1,Inf] There is %count% apples{% endtranschoice %}',
-                'There is no apples',
-                ['count' => 0],
-            ],
-            [
-                '{% transchoice 5 into "fr"%}{0} There is no apples|{1} There is one apple|]1,Inf] There is %count% apples{% endtranschoice %}',
-                'There is 5 apples',
-            ],
-
-            // trans filter
-            ['{{ "Hello"|trans }}', 'Hello'],
-            ['{{ name|trans }}', 'Symfony', ['name' => 'Symfony']],
-            ['{{ hello|trans({ \'%name%\': \'Symfony\' }) }}', 'Hello Symfony', ['hello' => 'Hello %name%']],
-            ['{% set vars = { \'%name%\': \'Symfony\' } %}{{ hello|trans(vars) }}', 'Hello Symfony', ['hello' => 'Hello %name%']],
-            ['{{ "Hello"|trans({}, "messages", "fr") }}', 'Hello'],
-
-            // transchoice filter
-            ['{{ "{0} There is no apples|{1} There is one apple|]1,Inf] There is %count% apples"|transchoice(count) }}', 'There is 5 apples', ['count' => 5]],
-            ['{{ text|transchoice(5, {\'%name%\': \'Symfony\'}) }}', 'There is 5 apples (Symfony)', ['text' => '{0} There is no apples|{1} There is one apple|]1,Inf] There is %count% apples (%name%)']],
-            ['{{ "{0} There is no apples|{1} There is one apple|]1,Inf] There is %count% apples"|transchoice(count, {}, "messages", "fr") }}', 'There is 5 apples', ['count' => 5]],
-        ];
-    }
-
     public function testDefaultTranslationDomain()
     {
         $templates = [
diff --git a/src/Symfony/Bridge/Twig/Tests/NodeVisitor/TranslationDefaultDomainNodeVisitorTest.php b/src/Symfony/Bridge/Twig/Tests/NodeVisitor/TranslationDefaultDomainNodeVisitorTest.php
index 5abfe1e92a..16fde044ba 100644
--- a/src/Symfony/Bridge/Twig/Tests/NodeVisitor/TranslationDefaultDomainNodeVisitorTest.php
+++ b/src/Symfony/Bridge/Twig/Tests/NodeVisitor/TranslationDefaultDomainNodeVisitorTest.php
@@ -79,15 +79,11 @@ class TranslationDefaultDomainNodeVisitorTest extends TestCase
     {
         return [
             [TwigNodeProvider::getTransFilter(self::$message)],
-            [TwigNodeProvider::getTransChoiceFilter(self::$message)],
             [TwigNodeProvider::getTransTag(self::$message)],
             // with named arguments
             [TwigNodeProvider::getTransFilter(self::$message, null, [
                 'arguments' => new ArrayExpression([], 0),
             ])],
-            [TwigNodeProvider::getTransChoiceFilter(self::$message), null, [
-                'arguments' => new ArrayExpression([], 0),
-            ]],
         ];
     }
 }
diff --git a/src/Symfony/Bridge/Twig/Tests/NodeVisitor/TranslationNodeVisitorTest.php b/src/Symfony/Bridge/Twig/Tests/NodeVisitor/TranslationNodeVisitorTest.php
index 11d16e4cd6..a2cd6963d8 100644
--- a/src/Symfony/Bridge/Twig/Tests/NodeVisitor/TranslationNodeVisitorTest.php
+++ b/src/Symfony/Bridge/Twig/Tests/NodeVisitor/TranslationNodeVisitorTest.php
@@ -57,10 +57,8 @@ class TranslationNodeVisitorTest extends TestCase
 
         return [
             [TwigNodeProvider::getTransFilter($message), [[$message, null]]],
-            [TwigNodeProvider::getTransChoiceFilter($message), [[$message, null]]],
             [TwigNodeProvider::getTransTag($message), [[$message, null]]],
             [TwigNodeProvider::getTransFilter($message, $domain), [[$message, $domain]]],
-            [TwigNodeProvider::getTransChoiceFilter($message, $domain), [[$message, $domain]]],
             [TwigNodeProvider::getTransTag($message, $domain), [[$message, $domain]]],
         ];
     }
diff --git a/src/Symfony/Bridge/Twig/Tests/NodeVisitor/TwigNodeProvider.php b/src/Symfony/Bridge/Twig/Tests/NodeVisitor/TwigNodeProvider.php
index 5147724675..69311afdc8 100644
--- a/src/Symfony/Bridge/Twig/Tests/NodeVisitor/TwigNodeProvider.php
+++ b/src/Symfony/Bridge/Twig/Tests/NodeVisitor/TwigNodeProvider.php
@@ -53,24 +53,6 @@ class TwigNodeProvider
         );
     }
 
-    public static function getTransChoiceFilter($message, $domain = null, $arguments = null)
-    {
-        if (!$arguments) {
-            $arguments = $domain ? [
-                new ConstantExpression(0, 0),
-                new ArrayExpression([], 0),
-                new ConstantExpression($domain, 0),
-            ] : [];
-        }
-
-        return new FilterExpression(
-            new ConstantExpression($message, 0),
-            new ConstantExpression('transchoice', 0),
-            new Node($arguments),
-            0
-        );
-    }
-
     public static function getTransTag($message, $domain = null)
     {
         return new TransNode(
diff --git a/src/Symfony/Bridge/Twig/Tests/Translation/TwigExtractorTest.php b/src/Symfony/Bridge/Twig/Tests/Translation/TwigExtractorTest.php
index 1f5c1955c7..608f7241f4 100644
--- a/src/Symfony/Bridge/Twig/Tests/Translation/TwigExtractorTest.php
+++ b/src/Symfony/Bridge/Twig/Tests/Translation/TwigExtractorTest.php
@@ -50,15 +50,6 @@ class TwigExtractorTest extends TestCase
         }
     }
 
-    /**
-     * @group legacy
-     * @dataProvider getLegacyExtractData
-     */
-    public function testLegacyExtract($template, $messages)
-    {
-        $this->testExtract($template, $messages);
-    }
-
     public function getExtractData()
     {
         return [
@@ -80,24 +71,6 @@ class TwigExtractorTest extends TestCase
         ];
     }
 
-    /**
-     * @group legacy
-     */
-    public function getLegacyExtractData()
-    {
-        return [
-            ['{{ "new key" | transchoice(1) }}', ['new key' => 'messages']],
-            ['{{ "new key" | transchoice(1) | upper }}', ['new key' => 'messages']],
-            ['{{ "new key" | transchoice(1, {}, "domain") }}', ['new key' => 'domain']],
-
-            // make sure 'trans_default_domain' tag is supported
-            ['{% trans_default_domain "domain" %}{{ "new key"|transchoice }}', ['new key' => 'domain']],
-
-            // make sure this works with twig's named arguments
-            ['{{ "new key" | transchoice(domain="domain", count=1) }}', ['new key' => 'domain']],
-        ];
-    }
-
     /**
      * @expectedException \Twig\Error\Error
      * @dataProvider resourcesWithSyntaxErrorsProvider
diff --git a/src/Symfony/Bridge/Twig/TokenParser/TransChoiceTokenParser.php b/src/Symfony/Bridge/Twig/TokenParser/TransChoiceTokenParser.php
deleted file mode 100644
index 08b44b27b8..0000000000
--- a/src/Symfony/Bridge/Twig/TokenParser/TransChoiceTokenParser.php
+++ /dev/null
@@ -1,97 +0,0 @@
-<?php
-
-/*
- * This file is part of the Symfony package.
- *
- * (c) Fabien Potencier <fabien@symfony.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Symfony\Bridge\Twig\TokenParser;
-
-use Symfony\Bridge\Twig\Node\TransNode;
-use Twig\Error\SyntaxError;
-use Twig\Node\Expression\AbstractExpression;
-use Twig\Node\Expression\ArrayExpression;
-use Twig\Node\Node;
-use Twig\Node\TextNode;
-use Twig\Token;
-
-/**
- * Token Parser for the 'transchoice' tag.
- *
- * @author Fabien Potencier <fabien@symfony.com>
- *
- * @deprecated since Symfony 4.2, use the "trans" tag with a "%count%" parameter instead
- */
-class TransChoiceTokenParser extends TransTokenParser
-{
-    /**
-     * Parses a token and returns a node.
-     *
-     * @return Node
-     *
-     * @throws SyntaxError
-     */
-    public function parse(Token $token)
-    {
-        $lineno = $token->getLine();
-        $stream = $this->parser->getStream();
-
-        @trigger_error(sprintf('The "transchoice" tag is deprecated since Symfony 4.2, use the "trans" one instead with a "%%count%%" parameter in %s line %d.', $stream->getSourceContext()->getName(), $lineno), E_USER_DEPRECATED);
-
-        $vars = new ArrayExpression([], $lineno);
-
-        $count = $this->parser->getExpressionParser()->parseExpression();
-
-        $domain = null;
-        $locale = null;
-
-        if ($stream->test('with')) {
-            // {% transchoice count with vars %}
-            $stream->next();
-            $vars = $this->parser->getExpressionParser()->parseExpression();
-        }
-
-        if ($stream->test('from')) {
-            // {% transchoice count from "messages" %}
-            $stream->next();
-            $domain = $this->parser->getExpressionParser()->parseExpression();
-        }
-
-        if ($stream->test('into')) {
-            // {% transchoice count into "fr" %}
-            $stream->next();
-            $locale = $this->parser->getExpressionParser()->parseExpression();
-        }
-
-        $stream->expect(Token::BLOCK_END_TYPE);
-
-        $body = $this->parser->subparse([$this, 'decideTransChoiceFork'], true);
-
-        if (!$body instanceof TextNode && !$body instanceof AbstractExpression) {
-            throw new SyntaxError('A message inside a transchoice tag must be a simple text.', $body->getTemplateLine(), $stream->getSourceContext());
-        }
-
-        $stream->expect(Token::BLOCK_END_TYPE);
-
-        return new TransNode($body, $domain, $count, $vars, $locale, $lineno, $this->getTag());
-    }
-
-    public function decideTransChoiceFork($token)
-    {
-        return $token->test(['endtranschoice']);
-    }
-
-    /**
-     * Gets the tag name associated with this token parser.
-     *
-     * @return string The tag name
-     */
-    public function getTag()
-    {
-        return 'transchoice';
-    }
-}
diff --git a/src/Symfony/Bundle/FrameworkBundle/Resources/config/identity_translator.xml b/src/Symfony/Bundle/FrameworkBundle/Resources/config/identity_translator.xml
index e39a1c4d95..9dccb43ee5 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Resources/config/identity_translator.xml
+++ b/src/Symfony/Bundle/FrameworkBundle/Resources/config/identity_translator.xml
@@ -7,7 +7,6 @@
         <defaults public="false" />
 
         <service id="translator" class="Symfony\Component\Translation\IdentityTranslator" public="true" />
-        <service id="Symfony\Component\Translation\TranslatorInterface" alias="translator" />
         <service id="Symfony\Contracts\Translation\TranslatorInterface" alias="translator" />
 
         <service id="identity_translator" class="Symfony\Component\Translation\IdentityTranslator" />
diff --git a/src/Symfony/Bundle/FrameworkBundle/Resources/config/translation.xml b/src/Symfony/Bundle/FrameworkBundle/Resources/config/translation.xml
index a9d5a85d20..07213a2602 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Resources/config/translation.xml
+++ b/src/Symfony/Bundle/FrameworkBundle/Resources/config/translation.xml
@@ -21,7 +21,6 @@
             </call>
             <tag name="kernel.locale_aware" />
         </service>
-        <service id="Symfony\Component\Translation\TranslatorInterface" alias="translator" />
         <service id="Symfony\Contracts\Translation\TranslatorInterface" alias="translator" />
 
         <service id="translator.logging" class="Symfony\Component\Translation\LoggingTranslator">
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Fixtures/Resources/views/translation.html.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Fixtures/Resources/views/translation.html.php
index b8a20d246a..7b36fba5d9 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Fixtures/Resources/views/translation.html.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Fixtures/Resources/views/translation.html.php
@@ -26,12 +26,6 @@ EOF
 
 <?php echo $view['translator']->trans('single-quoted key with "quote mark at the end"') ?>
 
-<?php echo $view['translator']->transChoice(
-    '{0} There is no apples|{1} There is one apple|]1,Inf[ There are %count% apples',
-    10,
-    ['%count%' => 10]
-) ?>
-
 <?php echo $view['translator']->trans('other-domain-test-no-params-short-array', [], 'not_messages'); ?>
 
 <?php echo $view['translator']->trans('other-domain-test-no-params-long-array', [], 'not_messages'); ?>
@@ -40,10 +34,4 @@ EOF
 
 <?php echo $view['translator']->trans('other-domain-test-params-long-array', ['foo' => 'bar'], 'not_messages'); ?>
 
-<?php echo $view['translator']->transChoice('other-domain-test-trans-choice-short-array-%count%', 10, ['%count%' => 10], 'not_messages'); ?>
-
-<?php echo $view['translator']->transChoice('other-domain-test-trans-choice-long-array-%count%', 10, ['%count%' => 10], 'not_messages'); ?>
-
 <?php echo $view['translator']->trans('typecast', ['a' => (int) '123'], 'not_messages'); ?>
-<?php echo $view['translator']->transChoice('msg1', 10 + 1, [], 'not_messages'); ?>
-<?php echo $view['translator']->transChoice('msg2', ceil(4.5), [], 'not_messages'); ?>
diff --git a/src/Symfony/Bundle/FrameworkBundle/composer.json b/src/Symfony/Bundle/FrameworkBundle/composer.json
index efe19217ff..52a3e8daa2 100644
--- a/src/Symfony/Bundle/FrameworkBundle/composer.json
+++ b/src/Symfony/Bundle/FrameworkBundle/composer.json
@@ -49,7 +49,7 @@
         "symfony/serializer": "^4.4|^5.0",
         "symfony/stopwatch": "^4.4|^5.0",
         "symfony/translation": "^4.4|^5.0",
-        "symfony/twig-bundle": "^5.0",
+        "symfony/twig-bundle": "^4.4|^5.0",
         "symfony/validator": "^4.4|^5.0",
         "symfony/var-dumper": "^4.4|^5.0",
         "symfony/workflow": "^4.4|^5.0",
@@ -76,7 +76,7 @@
         "symfony/serializer": "<4.4",
         "symfony/stopwatch": "<4.4",
         "symfony/translation": "<4.4",
-        "symfony/twig-bundle": "<5.0",
+        "symfony/twig-bundle": "<4.4",
         "symfony/twig-bridge": "<4.4",
         "symfony/validator": "<4.4",
         "symfony/workflow": "<4.4"
diff --git a/src/Symfony/Component/Form/Extension/Core/CoreExtension.php b/src/Symfony/Component/Form/Extension/Core/CoreExtension.php
index b658b9979f..6f5454ba1c 100644
--- a/src/Symfony/Component/Form/Extension/Core/CoreExtension.php
+++ b/src/Symfony/Component/Form/Extension/Core/CoreExtension.php
@@ -19,7 +19,6 @@ use Symfony\Component\Form\ChoiceList\Factory\PropertyAccessDecorator;
 use Symfony\Component\Form\Extension\Core\Type\TransformationFailureExtension;
 use Symfony\Component\PropertyAccess\PropertyAccess;
 use Symfony\Component\PropertyAccess\PropertyAccessorInterface;
-use Symfony\Component\Translation\TranslatorInterface as LegacyTranslatorInterface;
 use Symfony\Contracts\Translation\TranslatorInterface;
 
 /**
@@ -33,14 +32,8 @@ class CoreExtension extends AbstractExtension
     private $choiceListFactory;
     private $translator;
 
-    /**
-     * @param TranslatorInterface|null $translator
-     */
-    public function __construct(PropertyAccessorInterface $propertyAccessor = null, ChoiceListFactoryInterface $choiceListFactory = null, $translator = null)
+    public function __construct(PropertyAccessorInterface $propertyAccessor = null, ChoiceListFactoryInterface $choiceListFactory = null, TranslatorInterface $translator = null)
     {
-        if (null !== $translator && !$translator instanceof LegacyTranslatorInterface && !$translator instanceof TranslatorInterface) {
-            throw new \TypeError(sprintf('Argument 3 passed to %s() must be an instance of %s, %s given.', __METHOD__, TranslatorInterface::class, \is_object($translator) ? \get_class($translator) : \gettype($translator)));
-        }
         $this->propertyAccessor = $propertyAccessor ?: PropertyAccess::createPropertyAccessor();
         $this->choiceListFactory = $choiceListFactory ?: new CachingFactoryDecorator(new PropertyAccessDecorator(new DefaultChoiceListFactory(), $this->propertyAccessor));
         $this->translator = $translator;
diff --git a/src/Symfony/Component/Form/Extension/Core/EventListener/TransformationFailureListener.php b/src/Symfony/Component/Form/Extension/Core/EventListener/TransformationFailureListener.php
index f5e73849b3..95763c26c7 100644
--- a/src/Symfony/Component/Form/Extension/Core/EventListener/TransformationFailureListener.php
+++ b/src/Symfony/Component/Form/Extension/Core/EventListener/TransformationFailureListener.php
@@ -15,7 +15,6 @@ use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 use Symfony\Component\Form\FormError;
 use Symfony\Component\Form\FormEvent;
 use Symfony\Component\Form\FormEvents;
-use Symfony\Component\Translation\TranslatorInterface as LegacyTranslatorInterface;
 use Symfony\Contracts\Translation\TranslatorInterface;
 
 /**
@@ -25,14 +24,8 @@ class TransformationFailureListener implements EventSubscriberInterface
 {
     private $translator;
 
-    /**
-     * @param TranslatorInterface|null $translator
-     */
-    public function __construct($translator = null)
+    public function __construct(TranslatorInterface $translator = null)
     {
-        if (null !== $translator && !$translator instanceof LegacyTranslatorInterface && !$translator instanceof TranslatorInterface) {
-            throw new \TypeError(sprintf('Argument 1 passed to %s() must be an instance of %s, %s given.', __METHOD__, TranslatorInterface::class, \is_object($translator) ? \get_class($translator) : \gettype($translator)));
-        }
         $this->translator = $translator;
     }
 
diff --git a/src/Symfony/Component/Form/Extension/Core/Type/FileType.php b/src/Symfony/Component/Form/Extension/Core/Type/FileType.php
index f8afce2ee5..4dc71db4f2 100644
--- a/src/Symfony/Component/Form/Extension/Core/Type/FileType.php
+++ b/src/Symfony/Component/Form/Extension/Core/Type/FileType.php
@@ -20,7 +20,7 @@ use Symfony\Component\Form\FormInterface;
 use Symfony\Component\Form\FormView;
 use Symfony\Component\OptionsResolver\Options;
 use Symfony\Component\OptionsResolver\OptionsResolver;
-use Symfony\Component\Translation\TranslatorInterface;
+use Symfony\Contracts\Translation\TranslatorInterface;
 
 class FileType extends AbstractType
 {
diff --git a/src/Symfony/Component/Form/Extension/Core/Type/TransformationFailureExtension.php b/src/Symfony/Component/Form/Extension/Core/Type/TransformationFailureExtension.php
index 8cdca71b65..f93586ef73 100644
--- a/src/Symfony/Component/Form/Extension/Core/Type/TransformationFailureExtension.php
+++ b/src/Symfony/Component/Form/Extension/Core/Type/TransformationFailureExtension.php
@@ -14,7 +14,6 @@ namespace Symfony\Component\Form\Extension\Core\Type;
 use Symfony\Component\Form\AbstractTypeExtension;
 use Symfony\Component\Form\Extension\Core\EventListener\TransformationFailureListener;
 use Symfony\Component\Form\FormBuilderInterface;
-use Symfony\Component\Translation\TranslatorInterface as LegacyTranslatorInterface;
 use Symfony\Contracts\Translation\TranslatorInterface;
 
 /**
@@ -24,14 +23,8 @@ class TransformationFailureExtension extends AbstractTypeExtension
 {
     private $translator;
 
-    /**
-     * @param TranslatorInterface|null $translator
-     */
-    public function __construct($translator = null)
+    public function __construct(TranslatorInterface $translator = null)
     {
-        if (null !== $translator && !$translator instanceof LegacyTranslatorInterface && !$translator instanceof TranslatorInterface) {
-            throw new \TypeError(sprintf('Argument 1 passed to %s() must be an instance of %s, %s given.', __METHOD__, TranslatorInterface::class, \is_object($translator) ? \get_class($translator) : \gettype($translator)));
-        }
         $this->translator = $translator;
     }
 
diff --git a/src/Symfony/Component/Form/Extension/Csrf/CsrfExtension.php b/src/Symfony/Component/Form/Extension/Csrf/CsrfExtension.php
index 502316e257..609a371ea0 100644
--- a/src/Symfony/Component/Form/Extension/Csrf/CsrfExtension.php
+++ b/src/Symfony/Component/Form/Extension/Csrf/CsrfExtension.php
@@ -13,7 +13,6 @@ namespace Symfony\Component\Form\Extension\Csrf;
 
 use Symfony\Component\Form\AbstractExtension;
 use Symfony\Component\Security\Csrf\CsrfTokenManagerInterface;
-use Symfony\Component\Translation\TranslatorInterface as LegacyTranslatorInterface;
 use Symfony\Contracts\Translation\TranslatorInterface;
 
 /**
@@ -27,16 +26,8 @@ class CsrfExtension extends AbstractExtension
     private $translator;
     private $translationDomain;
 
-    /**
-     * @param CsrfTokenManagerInterface $tokenManager      The CSRF token manager
-     * @param TranslatorInterface|null  $translator        The translator for translating error messages
-     * @param string|null               $translationDomain The translation domain for translating
-     */
-    public function __construct(CsrfTokenManagerInterface $tokenManager, $translator = null, string $translationDomain = null)
+    public function __construct(CsrfTokenManagerInterface $tokenManager, TranslatorInterface $translator = null, string $translationDomain = null)
     {
-        if (null !== $translator && !$translator instanceof LegacyTranslatorInterface && !$translator instanceof TranslatorInterface) {
-            throw new \TypeError(sprintf('Argument 2 passed to %s() must be an instance of %s, %s given.', __METHOD__, TranslatorInterface::class, \is_object($translator) ? \get_class($translator) : \gettype($translator)));
-        }
         $this->tokenManager = $tokenManager;
         $this->translator = $translator;
         $this->translationDomain = $translationDomain;
diff --git a/src/Symfony/Component/Form/Extension/Csrf/EventListener/CsrfValidationListener.php b/src/Symfony/Component/Form/Extension/Csrf/EventListener/CsrfValidationListener.php
index 7c5181e17d..d30bdef61e 100644
--- a/src/Symfony/Component/Form/Extension/Csrf/EventListener/CsrfValidationListener.php
+++ b/src/Symfony/Component/Form/Extension/Csrf/EventListener/CsrfValidationListener.php
@@ -18,7 +18,6 @@ use Symfony\Component\Form\FormEvents;
 use Symfony\Component\Form\Util\ServerParams;
 use Symfony\Component\Security\Csrf\CsrfToken;
 use Symfony\Component\Security\Csrf\CsrfTokenManagerInterface;
-use Symfony\Component\Translation\TranslatorInterface as LegacyTranslatorInterface;
 use Symfony\Contracts\Translation\TranslatorInterface;
 
 /**
@@ -41,14 +40,8 @@ class CsrfValidationListener implements EventSubscriberInterface
         ];
     }
 
-    /**
-     * @param TranslatorInterface|null $translator
-     */
-    public function __construct(string $fieldName, CsrfTokenManagerInterface $tokenManager, string $tokenId, string $errorMessage, $translator = null, string $translationDomain = null, ServerParams $serverParams = null)
+    public function __construct(string $fieldName, CsrfTokenManagerInterface $tokenManager, string $tokenId, string $errorMessage, TranslatorInterface $translator = null, string $translationDomain = null, ServerParams $serverParams = null)
     {
-        if (null !== $translator && !$translator instanceof LegacyTranslatorInterface && !$translator instanceof TranslatorInterface) {
-            throw new \TypeError(sprintf('Argument 5 passed to %s() must be an instance of %s, %s given.', __METHOD__, TranslatorInterface::class, \is_object($translator) ? \get_class($translator) : \gettype($translator)));
-        }
         $this->fieldName = $fieldName;
         $this->tokenManager = $tokenManager;
         $this->tokenId = $tokenId;
diff --git a/src/Symfony/Component/Form/Extension/Csrf/Type/FormTypeCsrfExtension.php b/src/Symfony/Component/Form/Extension/Csrf/Type/FormTypeCsrfExtension.php
index 5e5f26ff74..de8c7df4ba 100644
--- a/src/Symfony/Component/Form/Extension/Csrf/Type/FormTypeCsrfExtension.php
+++ b/src/Symfony/Component/Form/Extension/Csrf/Type/FormTypeCsrfExtension.php
@@ -20,7 +20,6 @@ use Symfony\Component\Form\FormView;
 use Symfony\Component\Form\Util\ServerParams;
 use Symfony\Component\OptionsResolver\OptionsResolver;
 use Symfony\Component\Security\Csrf\CsrfTokenManagerInterface;
-use Symfony\Component\Translation\TranslatorInterface as LegacyTranslatorInterface;
 use Symfony\Contracts\Translation\TranslatorInterface;
 
 /**
@@ -35,14 +34,8 @@ class FormTypeCsrfExtension extends AbstractTypeExtension
     private $translationDomain;
     private $serverParams;
 
-    /**
-     * @param TranslatorInterface|null $translator
-     */
-    public function __construct(CsrfTokenManagerInterface $defaultTokenManager, bool $defaultEnabled = true, string $defaultFieldName = '_token', $translator = null, string $translationDomain = null, ServerParams $serverParams = null)
+    public function __construct(CsrfTokenManagerInterface $defaultTokenManager, bool $defaultEnabled = true, string $defaultFieldName = '_token', TranslatorInterface $translator = null, string $translationDomain = null, ServerParams $serverParams = null)
     {
-        if (null !== $translator && !$translator instanceof LegacyTranslatorInterface && !$translator instanceof TranslatorInterface) {
-            throw new \TypeError(sprintf('Argument 4 passed to %s() must be an instance of %s, %s given.', __METHOD__, TranslatorInterface::class, \is_object($translator) ? \get_class($translator) : \gettype($translator)));
-        }
         $this->defaultTokenManager = $defaultTokenManager;
         $this->defaultEnabled = $defaultEnabled;
         $this->defaultFieldName = $defaultFieldName;
diff --git a/src/Symfony/Component/Form/Extension/Validator/Type/UploadValidatorExtension.php b/src/Symfony/Component/Form/Extension/Validator/Type/UploadValidatorExtension.php
index c5b71f903c..21e4fe20ea 100644
--- a/src/Symfony/Component/Form/Extension/Validator/Type/UploadValidatorExtension.php
+++ b/src/Symfony/Component/Form/Extension/Validator/Type/UploadValidatorExtension.php
@@ -15,7 +15,6 @@ use Symfony\Component\Form\AbstractTypeExtension;
 use Symfony\Component\Form\Extension\Core\Type\FormType;
 use Symfony\Component\OptionsResolver\Options;
 use Symfony\Component\OptionsResolver\OptionsResolver;
-use Symfony\Component\Translation\TranslatorInterface as LegacyTranslatorInterface;
 use Symfony\Contracts\Translation\TranslatorInterface;
 
 /**
@@ -27,14 +26,8 @@ class UploadValidatorExtension extends AbstractTypeExtension
     private $translator;
     private $translationDomain;
 
-    /**
-     * @param TranslatorInterface $translator
-     */
-    public function __construct($translator, string $translationDomain = null)
+    public function __construct(TranslatorInterface $translator, string $translationDomain = null)
     {
-        if (!$translator instanceof LegacyTranslatorInterface && !$translator instanceof TranslatorInterface) {
-            throw new \TypeError(sprintf('Argument 1 passed to %s() must be an instance of %s, %s given.', __METHOD__, TranslatorInterface::class, \is_object($translator) ? \get_class($translator) : \gettype($translator)));
-        }
         $this->translator = $translator;
         $this->translationDomain = $translationDomain;
     }
diff --git a/src/Symfony/Component/Form/Tests/Extension/Core/Type/FileTypeTest.php b/src/Symfony/Component/Form/Tests/Extension/Core/Type/FileTypeTest.php
index 311529c294..0731942c89 100644
--- a/src/Symfony/Component/Form/Tests/Extension/Core/Type/FileTypeTest.php
+++ b/src/Symfony/Component/Form/Tests/Extension/Core/Type/FileTypeTest.php
@@ -17,7 +17,7 @@ use Symfony\Component\Form\NativeRequestHandler;
 use Symfony\Component\Form\RequestHandlerInterface;
 use Symfony\Component\HttpFoundation\File\File;
 use Symfony\Component\HttpFoundation\File\UploadedFile;
-use Symfony\Component\Translation\TranslatorInterface;
+use Symfony\Contracts\Translation\TranslatorInterface;
 
 class FileTypeTest extends BaseTypeTest
 {
diff --git a/src/Symfony/Component/Form/Tests/Extension/Validator/Type/UploadValidatorExtensionTest.php b/src/Symfony/Component/Form/Tests/Extension/Validator/Type/UploadValidatorExtensionTest.php
index 34ff556d15..487bb40da7 100644
--- a/src/Symfony/Component/Form/Tests/Extension/Validator/Type/UploadValidatorExtensionTest.php
+++ b/src/Symfony/Component/Form/Tests/Extension/Validator/Type/UploadValidatorExtensionTest.php
@@ -15,6 +15,7 @@ use Symfony\Component\Form\Extension\Validator\Type\UploadValidatorExtension;
 use Symfony\Component\Form\Test\TypeTestCase;
 use Symfony\Component\OptionsResolver\Options;
 use Symfony\Component\OptionsResolver\OptionsResolver;
+use Symfony\Contracts\Translation\LocaleAwareInterface;
 use Symfony\Contracts\Translation\TranslatorInterface;
 
 class UploadValidatorExtensionTest extends TypeTestCase
@@ -38,18 +39,13 @@ class UploadValidatorExtensionTest extends TypeTestCase
     }
 }
 
-class DummyTranslator implements TranslatorInterface
+class DummyTranslator implements TranslatorInterface, LocaleAwareInterface
 {
     public function trans($id, array $parameters = [], $domain = null, $locale = null)
     {
         return 'translated max {{ max }}!';
     }
 
-    public function transChoice($id, $number, array $parameters = [], $domain = null, $locale = null)
-    {
-        return 'translated max {{ max }}!';
-    }
-
     public function setLocale($locale)
     {
     }
diff --git a/src/Symfony/Component/HttpKernel/CHANGELOG.md b/src/Symfony/Component/HttpKernel/CHANGELOG.md
index 8cca2ee8f7..9d29203ea5 100644
--- a/src/Symfony/Component/HttpKernel/CHANGELOG.md
+++ b/src/Symfony/Component/HttpKernel/CHANGELOG.md
@@ -8,6 +8,7 @@ CHANGELOG
  * removed `ConfigDataCollector::getApplicationName()` 
  * removed `ConfigDataCollector::getApplicationVersion()`
  * removed support for `Symfony\Component\Templating\EngineInterface` in `HIncludeFragmentRenderer`, use a `Twig\Environment` only
+ * removed `TranslatorListener`
 
 4.3.0
 -----
diff --git a/src/Symfony/Component/HttpKernel/EventListener/TranslatorListener.php b/src/Symfony/Component/HttpKernel/EventListener/TranslatorListener.php
deleted file mode 100644
index d28eee2b1a..0000000000
--- a/src/Symfony/Component/HttpKernel/EventListener/TranslatorListener.php
+++ /dev/null
@@ -1,80 +0,0 @@
-<?php
-
-/*
- * This file is part of the Symfony package.
- *
- * (c) Fabien Potencier <fabien@symfony.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Symfony\Component\HttpKernel\EventListener;
-
-@trigger_error(sprintf('The "%s" class is deprecated since Symfony 4.3 and will be removed in 5.0, use LocaleAwareListener instead.', TranslatorListener::class), E_USER_DEPRECATED);
-
-use Symfony\Component\EventDispatcher\EventSubscriberInterface;
-use Symfony\Component\HttpFoundation\Request;
-use Symfony\Component\HttpFoundation\RequestStack;
-use Symfony\Component\HttpKernel\Event\FinishRequestEvent;
-use Symfony\Component\HttpKernel\Event\GetResponseEvent;
-use Symfony\Component\HttpKernel\KernelEvents;
-use Symfony\Component\Translation\TranslatorInterface;
-use Symfony\Contracts\Translation\LocaleAwareInterface;
-
-/**
- * Synchronizes the locale between the request and the translator.
- *
- * @author Fabien Potencier <fabien@symfony.com>
- *
- * @deprecated since Symfony 4.3, use LocaleAwareListener instead
- */
-class TranslatorListener implements EventSubscriberInterface
-{
-    private $translator;
-    private $requestStack;
-
-    /**
-     * @param LocaleAwareInterface $translator
-     */
-    public function __construct($translator, RequestStack $requestStack)
-    {
-        if (!$translator instanceof TranslatorInterface && !$translator instanceof LocaleAwareInterface) {
-            throw new \TypeError(sprintf('Argument 1 passed to %s() must be an instance of %s, %s given.', __METHOD__, LocaleAwareInterface::class, \is_object($translator) ? \get_class($translator) : \gettype($translator)));
-        }
-        $this->translator = $translator;
-        $this->requestStack = $requestStack;
-    }
-
-    public function onKernelRequest(GetResponseEvent $event)
-    {
-        $this->setLocale($event->getRequest());
-    }
-
-    public function onKernelFinishRequest(FinishRequestEvent $event)
-    {
-        if (null === $parentRequest = $this->requestStack->getParentRequest()) {
-            return;
-        }
-
-        $this->setLocale($parentRequest);
-    }
-
-    public static function getSubscribedEvents()
-    {
-        return [
-            // must be registered after the Locale listener
-            KernelEvents::REQUEST => [['onKernelRequest', 10]],
-            KernelEvents::FINISH_REQUEST => [['onKernelFinishRequest', 0]],
-        ];
-    }
-
-    private function setLocale(Request $request)
-    {
-        try {
-            $this->translator->setLocale($request->getLocale());
-        } catch (\InvalidArgumentException $e) {
-            $this->translator->setLocale($request->getDefaultLocale());
-        }
-    }
-}
diff --git a/src/Symfony/Component/HttpKernel/Tests/EventListener/TranslatorListenerTest.php b/src/Symfony/Component/HttpKernel/Tests/EventListener/TranslatorListenerTest.php
deleted file mode 100644
index 9a833ce374..0000000000
--- a/src/Symfony/Component/HttpKernel/Tests/EventListener/TranslatorListenerTest.php
+++ /dev/null
@@ -1,122 +0,0 @@
-<?php
-
-/*
- * This file is part of the Symfony package.
- *
- * (c) Fabien Potencier <fabien@symfony.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Symfony\Component\HttpKernel\Tests\EventListener;
-
-use PHPUnit\Framework\TestCase;
-use Symfony\Component\HttpFoundation\Request;
-use Symfony\Component\HttpKernel\Event\FinishRequestEvent;
-use Symfony\Component\HttpKernel\Event\RequestEvent;
-use Symfony\Component\HttpKernel\EventListener\TranslatorListener;
-use Symfony\Component\HttpKernel\HttpKernelInterface;
-use Symfony\Contracts\Translation\LocaleAwareInterface;
-
-/**
- * @group legacy
- */
-class TranslatorListenerTest extends TestCase
-{
-    private $listener;
-    private $translator;
-    private $requestStack;
-
-    protected function setUp()
-    {
-        $this->translator = $this->getMockBuilder(LocaleAwareInterface::class)->getMock();
-        $this->requestStack = $this->getMockBuilder('Symfony\Component\HttpFoundation\RequestStack')->getMock();
-        $this->listener = new TranslatorListener($this->translator, $this->requestStack);
-    }
-
-    public function testLocaleIsSetInOnKernelRequest()
-    {
-        $this->translator
-            ->expects($this->once())
-            ->method('setLocale')
-            ->with($this->equalTo('fr'));
-
-        $event = new RequestEvent($this->createHttpKernel(), $this->createRequest('fr'), HttpKernelInterface::MASTER_REQUEST);
-        $this->listener->onKernelRequest($event);
-    }
-
-    public function testDefaultLocaleIsUsedOnExceptionsInOnKernelRequest()
-    {
-        $this->translator
-            ->expects($this->at(0))
-            ->method('setLocale')
-            ->willThrowException(new \InvalidArgumentException());
-        $this->translator
-            ->expects($this->at(1))
-            ->method('setLocale')
-            ->with($this->equalTo('en'));
-
-        $event = new RequestEvent($this->createHttpKernel(), $this->createRequest('fr'), HttpKernelInterface::MASTER_REQUEST);
-        $this->listener->onKernelRequest($event);
-    }
-
-    public function testLocaleIsSetInOnKernelFinishRequestWhenParentRequestExists()
-    {
-        $this->translator
-            ->expects($this->once())
-            ->method('setLocale')
-            ->with($this->equalTo('fr'));
-
-        $this->setMasterRequest($this->createRequest('fr'));
-        $event = new FinishRequestEvent($this->createHttpKernel(), $this->createRequest('de'), HttpKernelInterface::SUB_REQUEST);
-        $this->listener->onKernelFinishRequest($event);
-    }
-
-    public function testLocaleIsNotSetInOnKernelFinishRequestWhenParentRequestDoesNotExist()
-    {
-        $this->translator
-            ->expects($this->never())
-            ->method('setLocale');
-
-        $event = new FinishRequestEvent($this->createHttpKernel(), $this->createRequest('de'), HttpKernelInterface::SUB_REQUEST);
-        $this->listener->onKernelFinishRequest($event);
-    }
-
-    public function testDefaultLocaleIsUsedOnExceptionsInOnKernelFinishRequest()
-    {
-        $this->translator
-            ->expects($this->at(0))
-            ->method('setLocale')
-            ->willThrowException(new \InvalidArgumentException());
-        $this->translator
-            ->expects($this->at(1))
-            ->method('setLocale')
-            ->with($this->equalTo('en'));
-
-        $this->setMasterRequest($this->createRequest('fr'));
-        $event = new FinishRequestEvent($this->createHttpKernel(), $this->createRequest('de'), HttpKernelInterface::SUB_REQUEST);
-        $this->listener->onKernelFinishRequest($event);
-    }
-
-    private function createHttpKernel()
-    {
-        return $this->getMockBuilder('Symfony\Component\HttpKernel\HttpKernelInterface')->getMock();
-    }
-
-    private function createRequest($locale)
-    {
-        $request = new Request();
-        $request->setLocale($locale);
-
-        return $request;
-    }
-
-    private function setMasterRequest($request)
-    {
-        $this->requestStack
-            ->expects($this->any())
-            ->method('getParentRequest')
-            ->willReturn($request);
-    }
-}
diff --git a/src/Symfony/Component/Translation/CHANGELOG.md b/src/Symfony/Component/Translation/CHANGELOG.md
index c80716838b..d244000b38 100644
--- a/src/Symfony/Component/Translation/CHANGELOG.md
+++ b/src/Symfony/Component/Translation/CHANGELOG.md
@@ -1,6 +1,19 @@
 CHANGELOG
 =========
 
+5.0.0
+-----
+
+ * removed `TranslatorInterface`
+ * removed `MessageSelector`
+ * removed `ChoiceMessageFormatterInterface`
+ * removed `PluralizationRule`
+ * removed `Interval`
+ * removed `transChoice()` methods, use the trans() method instead with a %count% parameter
+ * removed `FileDumper::setBackup()` and `TranslationWriter::disableBackup()`
+ * removed `MessageFormatter::choiceFormat()`
+ * added argument `$filename` to `PhpExtractor::parseTokens()`
+
 4.3.0
 -----
 
diff --git a/src/Symfony/Component/Translation/DataCollectorTranslator.php b/src/Symfony/Component/Translation/DataCollectorTranslator.php
index 0284b77e9b..37dd5b4af3 100644
--- a/src/Symfony/Component/Translation/DataCollectorTranslator.php
+++ b/src/Symfony/Component/Translation/DataCollectorTranslator.php
@@ -13,14 +13,13 @@ namespace Symfony\Component\Translation;
 
 use Symfony\Component\HttpKernel\CacheWarmer\WarmableInterface;
 use Symfony\Component\Translation\Exception\InvalidArgumentException;
-use Symfony\Component\Translation\TranslatorInterface as LegacyTranslatorInterface;
 use Symfony\Contracts\Translation\LocaleAwareInterface;
 use Symfony\Contracts\Translation\TranslatorInterface;
 
 /**
  * @author Abdellatif Ait boudad <a.aitboudad@gmail.com>
  */
-class DataCollectorTranslator implements LegacyTranslatorInterface, TranslatorInterface, TranslatorBagInterface, WarmableInterface
+class DataCollectorTranslator implements TranslatorInterface, TranslatorBagInterface, LocaleAwareInterface, WarmableInterface
 {
     const MESSAGE_DEFINED = 0;
     const MESSAGE_MISSING = 1;
@@ -36,11 +35,8 @@ class DataCollectorTranslator implements LegacyTranslatorInterface, TranslatorIn
     /**
      * @param TranslatorInterface $translator The translator must implement TranslatorBagInterface
      */
-    public function __construct($translator)
+    public function __construct(TranslatorInterface $translator)
     {
-        if (!$translator instanceof LegacyTranslatorInterface && !$translator instanceof TranslatorInterface) {
-            throw new \TypeError(sprintf('Argument 1 passed to %s() must be an instance of %s, %s given.', __METHOD__, TranslatorInterface::class, \is_object($translator) ? \get_class($translator) : \gettype($translator)));
-        }
         if (!$translator instanceof TranslatorBagInterface || !$translator instanceof LocaleAwareInterface) {
             throw new InvalidArgumentException(sprintf('The Translator "%s" must implement TranslatorInterface, TranslatorBagInterface and LocaleAwareInterface.', \get_class($translator)));
         }
@@ -59,24 +55,6 @@ class DataCollectorTranslator implements LegacyTranslatorInterface, TranslatorIn
         return $trans;
     }
 
-    /**
-     * {@inheritdoc}
-     *
-     * @deprecated since Symfony 4.2, use the trans() method instead with a %count% parameter
-     */
-    public function transChoice($id, $number, array $parameters = [], $domain = null, $locale = null)
-    {
-        if ($this->translator instanceof TranslatorInterface) {
-            $trans = $this->translator->trans($id, ['%count%' => $number] + $parameters, $domain, $locale);
-        } else {
-            $trans = $this->translator->transChoice($id, $number, $parameters, $domain, $locale);
-        }
-
-        $this->collectMessage($locale, $domain, $id, $trans, ['%count%' => $number] + $parameters);
-
-        return $trans;
-    }
-
     /**
      * {@inheritdoc}
      */
diff --git a/src/Symfony/Component/Translation/Dumper/FileDumper.php b/src/Symfony/Component/Translation/Dumper/FileDumper.php
index 8457ecc7ec..07eb78e9eb 100644
--- a/src/Symfony/Component/Translation/Dumper/FileDumper.php
+++ b/src/Symfony/Component/Translation/Dumper/FileDumper.php
@@ -42,22 +42,6 @@ abstract class FileDumper implements DumperInterface
         $this->relativePathTemplate = $relativePathTemplate;
     }
 
-    /**
-     * Sets backup flag.
-     *
-     * @param bool $backup
-     *
-     * @deprecated since Symfony 4.1
-     */
-    public function setBackup($backup)
-    {
-        @trigger_error(sprintf('The "%s()" method is deprecated since Symfony 4.1.', __METHOD__), E_USER_DEPRECATED);
-
-        if (false !== $backup) {
-            throw new \LogicException('The backup feature is no longer supported.');
-        }
-    }
-
     /**
      * {@inheritdoc}
      */
diff --git a/src/Symfony/Component/Translation/Extractor/PhpExtractor.php b/src/Symfony/Component/Translation/Extractor/PhpExtractor.php
index 84fd7400f8..cd7e02d4c3 100644
--- a/src/Symfony/Component/Translation/Extractor/PhpExtractor.php
+++ b/src/Symfony/Component/Translation/Extractor/PhpExtractor.php
@@ -48,30 +48,12 @@ class PhpExtractor extends AbstractFileExtractor implements ExtractorInterface
             ',',
             self::DOMAIN_TOKEN,
         ],
-        [
-            '->',
-            'transChoice',
-            '(',
-            self::MESSAGE_TOKEN,
-            ',',
-            self::METHOD_ARGUMENTS_TOKEN,
-            ',',
-            self::METHOD_ARGUMENTS_TOKEN,
-            ',',
-            self::DOMAIN_TOKEN,
-        ],
         [
             '->',
             'trans',
             '(',
             self::MESSAGE_TOKEN,
         ],
-        [
-            '->',
-            'transChoice',
-            '(',
-            self::MESSAGE_TOKEN,
-        ],
     ];
 
     /**
@@ -194,18 +176,9 @@ class PhpExtractor extends AbstractFileExtractor implements ExtractorInterface
 
     /**
      * Extracts trans message from PHP tokens.
-     *
-     * @param array            $tokens
-     * @param MessageCatalogue $catalog
-     * @param string           $filename
      */
-    protected function parseTokens($tokens, MessageCatalogue $catalog/*, string $filename*/)
+    protected function parseTokens(array $tokens, MessageCatalogue $catalog, string $filename)
     {
-        if (\func_num_args() < 3 && __CLASS__ !== \get_class($this) && __CLASS__ !== (new \ReflectionMethod($this, __FUNCTION__))->getDeclaringClass()->getName() && !$this instanceof \PHPUnit\Framework\MockObject\MockObject && !$this instanceof \Prophecy\Prophecy\ProphecySubjectInterface) {
-            @trigger_error(sprintf('The "%s()" method will have a new "string $filename" argument in version 5.0, not defining it is deprecated since Symfony 4.3.', __METHOD__), E_USER_DEPRECATED);
-        }
-        $filename = 2 < \func_num_args() ? \func_get_arg(2) : '';
-
         $tokenIterator = new \ArrayIterator($tokens);
 
         for ($key = 0; $key < $tokenIterator->count(); ++$key) {
diff --git a/src/Symfony/Component/Translation/Formatter/ChoiceMessageFormatterInterface.php b/src/Symfony/Component/Translation/Formatter/ChoiceMessageFormatterInterface.php
deleted file mode 100644
index 621dbb292d..0000000000
--- a/src/Symfony/Component/Translation/Formatter/ChoiceMessageFormatterInterface.php
+++ /dev/null
@@ -1,32 +0,0 @@
-<?php
-
-/*
- * This file is part of the Symfony package.
- *
- * (c) Fabien Potencier <fabien@symfony.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Symfony\Component\Translation\Formatter;
-
-/**
- * @author Abdellatif Ait boudad <a.aitboudad@gmail.com>
- *
- * @deprecated since Symfony 4.2, use MessageFormatterInterface::format() with a %count% parameter instead
- */
-interface ChoiceMessageFormatterInterface
-{
-    /**
-     * Formats a localized message pattern with given arguments.
-     *
-     * @param string $message    The message (may also be an object that can be cast to string)
-     * @param int    $number     The number to use to find the indice of the message
-     * @param string $locale     The message locale
-     * @param array  $parameters An array of parameters for the message
-     *
-     * @return string
-     */
-    public function choiceFormat($message, $number, $locale, array $parameters = []);
-}
diff --git a/src/Symfony/Component/Translation/Formatter/MessageFormatter.php b/src/Symfony/Component/Translation/Formatter/MessageFormatter.php
index 030d7a5c3e..4bbe0210b6 100644
--- a/src/Symfony/Component/Translation/Formatter/MessageFormatter.php
+++ b/src/Symfony/Component/Translation/Formatter/MessageFormatter.php
@@ -12,14 +12,12 @@
 namespace Symfony\Component\Translation\Formatter;
 
 use Symfony\Component\Translation\IdentityTranslator;
-use Symfony\Component\Translation\MessageSelector;
-use Symfony\Component\Translation\TranslatorInterface as LegacyTranslatorInterface;
 use Symfony\Contracts\Translation\TranslatorInterface;
 
 /**
  * @author Abdellatif Ait boudad <a.aitboudad@gmail.com>
  */
-class MessageFormatter implements MessageFormatterInterface, IntlFormatterInterface, ChoiceMessageFormatterInterface
+class MessageFormatter implements MessageFormatterInterface, IntlFormatterInterface
 {
     private $translator;
     private $intlFormatter;
@@ -27,14 +25,8 @@ class MessageFormatter implements MessageFormatterInterface, IntlFormatterInterf
     /**
      * @param TranslatorInterface|null $translator An identity translator to use as selector for pluralization
      */
-    public function __construct($translator = null, IntlFormatterInterface $intlFormatter = null)
+    public function __construct(TranslatorInterface $translator = null, IntlFormatterInterface $intlFormatter = null)
     {
-        if ($translator instanceof MessageSelector) {
-            $translator = new IdentityTranslator($translator);
-        } elseif (null !== $translator && !$translator instanceof TranslatorInterface && !$translator instanceof LegacyTranslatorInterface) {
-            throw new \TypeError(sprintf('Argument 1 passed to %s() must be an instance of %s, %s given.', __METHOD__, TranslatorInterface::class, \is_object($translator) ? \get_class($translator) : \gettype($translator)));
-        }
-
         $this->translator = $translator ?? new IdentityTranslator();
         $this->intlFormatter = $intlFormatter ?? new IntlFormatter();
     }
@@ -58,22 +50,4 @@ class MessageFormatter implements MessageFormatterInterface, IntlFormatterInterf
     {
         return $this->intlFormatter->formatIntl($message, $locale, $parameters);
     }
-
-    /**
-     * {@inheritdoc}
-     *
-     * @deprecated since Symfony 4.2, use format() with a %count% parameter instead
-     */
-    public function choiceFormat($message, $number, $locale, array $parameters = [])
-    {
-        @trigger_error(sprintf('The "%s()" method is deprecated since Symfony 4.2, use the format() one instead with a %%count%% parameter.', __METHOD__), E_USER_DEPRECATED);
-
-        $parameters = ['%count%' => $number] + $parameters;
-
-        if ($this->translator instanceof TranslatorInterface) {
-            return $this->format($message, $locale, $parameters);
-        }
-
-        return $this->format($this->translator->transChoice($message, $number, [], null, $locale), $locale, $parameters);
-    }
 }
diff --git a/src/Symfony/Component/Translation/IdentityTranslator.php b/src/Symfony/Component/Translation/IdentityTranslator.php
index b15792a9b5..46875edf2a 100644
--- a/src/Symfony/Component/Translation/IdentityTranslator.php
+++ b/src/Symfony/Component/Translation/IdentityTranslator.php
@@ -11,7 +11,7 @@
 
 namespace Symfony\Component\Translation;
 
-use Symfony\Component\Translation\TranslatorInterface as LegacyTranslatorInterface;
+use Symfony\Contracts\Translation\LocaleAwareInterface;
 use Symfony\Contracts\Translation\TranslatorInterface;
 use Symfony\Contracts\Translation\TranslatorTrait;
 
@@ -20,42 +20,7 @@ use Symfony\Contracts\Translation\TranslatorTrait;
  *
  * @author Fabien Potencier <fabien@symfony.com>
  */
-class IdentityTranslator implements LegacyTranslatorInterface, TranslatorInterface
+class IdentityTranslator implements TranslatorInterface, LocaleAwareInterface
 {
     use TranslatorTrait;
-
-    private $selector;
-
-    /**
-     * @param MessageSelector|null $selector The message selector for pluralization
-     */
-    public function __construct(MessageSelector $selector = null)
-    {
-        $this->selector = $selector;
-
-        if (__CLASS__ !== \get_class($this)) {
-            @trigger_error(sprintf('Calling "%s()" is deprecated since Symfony 4.2.', __METHOD__), E_USER_DEPRECATED);
-        }
-    }
-
-    /**
-     * {@inheritdoc}
-     *
-     * @deprecated since Symfony 4.2, use the trans() method instead with a %count% parameter
-     */
-    public function transChoice($id, $number, array $parameters = [], $domain = null, $locale = null)
-    {
-        @trigger_error(sprintf('The "%s()" method is deprecated since Symfony 4.2, use the trans() one instead with a "%%count%%" parameter.', __METHOD__), E_USER_DEPRECATED);
-
-        if ($this->selector) {
-            return strtr($this->selector->choose((string) $id, $number, $locale ?: $this->getLocale()), $parameters);
-        }
-
-        return $this->trans($id, ['%count%' => $number] + $parameters, $domain, $locale);
-    }
-
-    private function getPluralizationRule(int $number, string $locale): int
-    {
-        return PluralizationRules::get($number, $locale, false);
-    }
 }
diff --git a/src/Symfony/Component/Translation/Interval.php b/src/Symfony/Component/Translation/Interval.php
deleted file mode 100644
index a0e484da86..0000000000
--- a/src/Symfony/Component/Translation/Interval.php
+++ /dev/null
@@ -1,112 +0,0 @@
-<?php
-
-/*
- * This file is part of the Symfony package.
- *
- * (c) Fabien Potencier <fabien@symfony.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Symfony\Component\Translation;
-
-@trigger_error(sprintf('The "%s" class is deprecated since Symfony 4.2, use IdentityTranslator instead.', Interval::class), E_USER_DEPRECATED);
-
-use Symfony\Component\Translation\Exception\InvalidArgumentException;
-
-/**
- * Tests if a given number belongs to a given math interval.
- *
- * An interval can represent a finite set of numbers:
- *
- *  {1,2,3,4}
- *
- * An interval can represent numbers between two numbers:
- *
- *  [1, +Inf]
- *  ]-1,2[
- *
- * The left delimiter can be [ (inclusive) or ] (exclusive).
- * The right delimiter can be [ (exclusive) or ] (inclusive).
- * Beside numbers, you can use -Inf and +Inf for the infinite.
- *
- * @author Fabien Potencier <fabien@symfony.com>
- *
- * @see    http://en.wikipedia.org/wiki/Interval_%28mathematics%29#The_ISO_notation
- * @deprecated since Symfony 4.2, use IdentityTranslator instead
- */
-class Interval
-{
-    /**
-     * Tests if the given number is in the math interval.
-     *
-     * @param int    $number   A number
-     * @param string $interval An interval
-     *
-     * @return bool
-     *
-     * @throws InvalidArgumentException
-     */
-    public static function test($number, $interval)
-    {
-        $interval = trim($interval);
-
-        if (!preg_match('/^'.self::getIntervalRegexp().'$/x', $interval, $matches)) {
-            throw new InvalidArgumentException(sprintf('"%s" is not a valid interval.', $interval));
-        }
-
-        if ($matches[1]) {
-            foreach (explode(',', $matches[2]) as $n) {
-                if ($number == $n) {
-                    return true;
-                }
-            }
-        } else {
-            $leftNumber = self::convertNumber($matches['left']);
-            $rightNumber = self::convertNumber($matches['right']);
-
-            return
-                ('[' === $matches['left_delimiter'] ? $number >= $leftNumber : $number > $leftNumber)
-                && (']' === $matches['right_delimiter'] ? $number <= $rightNumber : $number < $rightNumber)
-            ;
-        }
-
-        return false;
-    }
-
-    /**
-     * Returns a Regexp that matches valid intervals.
-     *
-     * @return string A Regexp (without the delimiters)
-     */
-    public static function getIntervalRegexp()
-    {
-        return <<<EOF
-        ({\s*
-            (\-?\d+(\.\d+)?[\s*,\s*\-?\d+(\.\d+)?]*)
-        \s*})
-
-            |
-
-        (?P<left_delimiter>[\[\]])
-            \s*
-            (?P<left>-Inf|\-?\d+(\.\d+)?)
-            \s*,\s*
-            (?P<right>\+?Inf|\-?\d+(\.\d+)?)
-            \s*
-        (?P<right_delimiter>[\[\]])
-EOF;
-    }
-
-    private static function convertNumber($number)
-    {
-        if ('-Inf' === $number) {
-            return log(0);
-        } elseif ('+Inf' === $number || 'Inf' === $number) {
-            return -log(0);
-        }
-
-        return (float) $number;
-    }
-}
diff --git a/src/Symfony/Component/Translation/LoggingTranslator.php b/src/Symfony/Component/Translation/LoggingTranslator.php
index 3a84bf1170..c6097865ca 100644
--- a/src/Symfony/Component/Translation/LoggingTranslator.php
+++ b/src/Symfony/Component/Translation/LoggingTranslator.php
@@ -13,14 +13,13 @@ namespace Symfony\Component\Translation;
 
 use Psr\Log\LoggerInterface;
 use Symfony\Component\Translation\Exception\InvalidArgumentException;
-use Symfony\Component\Translation\TranslatorInterface as LegacyTranslatorInterface;
 use Symfony\Contracts\Translation\LocaleAwareInterface;
 use Symfony\Contracts\Translation\TranslatorInterface;
 
 /**
  * @author Abdellatif Ait boudad <a.aitboudad@gmail.com>
  */
-class LoggingTranslator implements TranslatorInterface, LegacyTranslatorInterface, TranslatorBagInterface
+class LoggingTranslator implements TranslatorInterface, TranslatorBagInterface, LocaleAwareInterface
 {
     /**
      * @var TranslatorInterface|TranslatorBagInterface
@@ -33,11 +32,8 @@ class LoggingTranslator implements TranslatorInterface, LegacyTranslatorInterfac
      * @param TranslatorInterface $translator The translator must implement TranslatorBagInterface
      * @param LoggerInterface     $logger
      */
-    public function __construct($translator, LoggerInterface $logger)
+    public function __construct(TranslatorInterface $translator, LoggerInterface $logger)
     {
-        if (!$translator instanceof LegacyTranslatorInterface && !$translator instanceof TranslatorInterface) {
-            throw new \TypeError(sprintf('Argument 1 passed to %s() must be an instance of %s, %s given.', __METHOD__, TranslatorInterface::class, \is_object($translator) ? \get_class($translator) : \gettype($translator)));
-        }
         if (!$translator instanceof TranslatorBagInterface || !$translator instanceof LocaleAwareInterface) {
             throw new InvalidArgumentException(sprintf('The Translator "%s" must implement TranslatorInterface, TranslatorBagInterface and LocaleAwareInterface.', \get_class($translator)));
         }
@@ -57,26 +53,6 @@ class LoggingTranslator implements TranslatorInterface, LegacyTranslatorInterfac
         return $trans;
     }
 
-    /**
-     * {@inheritdoc}
-     *
-     * @deprecated since Symfony 4.2, use the trans() method instead with a %count% parameter
-     */
-    public function transChoice($id, $number, array $parameters = [], $domain = null, $locale = null)
-    {
-        @trigger_error(sprintf('The "%s()" method is deprecated since Symfony 4.2, use the trans() one instead with a "%%count%%" parameter.', __METHOD__), E_USER_DEPRECATED);
-
-        if ($this->translator instanceof TranslatorInterface) {
-            $trans = $this->translator->trans($id, ['%count%' => $number] + $parameters, $domain, $locale);
-        } else {
-            $trans = $this->translator->transChoice($id, $number, $parameters, $domain, $locale);
-        }
-
-        $this->log($id, $domain, $locale);
-
-        return $trans;
-    }
-
     /**
      * {@inheritdoc}
      */
diff --git a/src/Symfony/Component/Translation/MessageSelector.php b/src/Symfony/Component/Translation/MessageSelector.php
deleted file mode 100644
index 0f0febb8b2..0000000000
--- a/src/Symfony/Component/Translation/MessageSelector.php
+++ /dev/null
@@ -1,98 +0,0 @@
-<?php
-
-/*
- * This file is part of the Symfony package.
- *
- * (c) Fabien Potencier <fabien@symfony.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Symfony\Component\Translation;
-
-@trigger_error(sprintf('The "%s" class is deprecated since Symfony 4.2, use IdentityTranslator instead.', MessageSelector::class), E_USER_DEPRECATED);
-
-use Symfony\Component\Translation\Exception\InvalidArgumentException;
-
-/**
- * MessageSelector.
- *
- * @author Fabien Potencier <fabien@symfony.com>
- * @author Bernhard Schussek <bschussek@gmail.com>
- *
- * @deprecated since Symfony 4.2, use IdentityTranslator instead.
- */
-class MessageSelector
-{
-    /**
-     * Given a message with different plural translations separated by a
-     * pipe (|), this method returns the correct portion of the message based
-     * on the given number, locale and the pluralization rules in the message
-     * itself.
-     *
-     * The message supports two different types of pluralization rules:
-     *
-     * interval: {0} There are no apples|{1} There is one apple|]1,Inf] There are %count% apples
-     * indexed:  There is one apple|There are %count% apples
-     *
-     * The indexed solution can also contain labels (e.g. one: There is one apple).
-     * This is purely for making the translations more clear - it does not
-     * affect the functionality.
-     *
-     * The two methods can also be mixed:
-     *     {0} There are no apples|one: There is one apple|more: There are %count% apples
-     *
-     * @param string    $message The message being translated
-     * @param int|float $number  The number of items represented for the message
-     * @param string    $locale  The locale to use for choosing
-     *
-     * @return string
-     *
-     * @throws InvalidArgumentException
-     */
-    public function choose($message, $number, $locale)
-    {
-        $parts = [];
-        if (preg_match('/^\|++$/', $message)) {
-            $parts = explode('|', $message);
-        } elseif (preg_match_all('/(?:\|\||[^\|])++/', $message, $matches)) {
-            $parts = $matches[0];
-        }
-
-        $explicitRules = [];
-        $standardRules = [];
-        foreach ($parts as $part) {
-            $part = trim(str_replace('||', '|', $part));
-
-            if (preg_match('/^(?P<interval>'.Interval::getIntervalRegexp().')\s*(?P<message>.*?)$/xs', $part, $matches)) {
-                $explicitRules[$matches['interval']] = $matches['message'];
-            } elseif (preg_match('/^\w+\:\s*(.*?)$/', $part, $matches)) {
-                $standardRules[] = $matches[1];
-            } else {
-                $standardRules[] = $part;
-            }
-        }
-
-        // try to match an explicit rule, then fallback to the standard ones
-        foreach ($explicitRules as $interval => $m) {
-            if (Interval::test($number, $interval)) {
-                return $m;
-            }
-        }
-
-        $position = PluralizationRules::get($number, $locale);
-
-        if (!isset($standardRules[$position])) {
-            // when there's exactly one rule given, and that rule is a standard
-            // rule, use this rule
-            if (1 === \count($parts) && isset($standardRules[0])) {
-                return $standardRules[0];
-            }
-
-            throw new InvalidArgumentException(sprintf('Unable to choose a translation for "%s" with locale "%s" for value "%d". Double check that this translation has the correct plural options (e.g. "There is one apple|There are %%count%% apples").', $message, $locale, $number));
-        }
-
-        return $standardRules[$position];
-    }
-}
diff --git a/src/Symfony/Component/Translation/PluralizationRules.php b/src/Symfony/Component/Translation/PluralizationRules.php
deleted file mode 100644
index ee8609fada..0000000000
--- a/src/Symfony/Component/Translation/PluralizationRules.php
+++ /dev/null
@@ -1,218 +0,0 @@
-<?php
-
-/*
- * This file is part of the Symfony package.
- *
- * (c) Fabien Potencier <fabien@symfony.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Symfony\Component\Translation;
-
-/**
- * Returns the plural rules for a given locale.
- *
- * @author Fabien Potencier <fabien@symfony.com>
- *
- * @deprecated since Symfony 4.2, use IdentityTranslator instead
- */
-class PluralizationRules
-{
-    private static $rules = [];
-
-    /**
-     * Returns the plural position to use for the given locale and number.
-     *
-     * @param int    $number The number
-     * @param string $locale The locale
-     *
-     * @return int The plural position
-     */
-    public static function get($number, $locale/*, bool $triggerDeprecation = true*/)
-    {
-        if (3 > \func_num_args() || \func_get_arg(2)) {
-            @trigger_error(sprintf('The "%s" class is deprecated since Symfony 4.2.', __CLASS__), E_USER_DEPRECATED);
-        }
-
-        if ('pt_BR' === $locale) {
-            // temporary set a locale for brazilian
-            $locale = 'xbr';
-        }
-
-        if (\strlen($locale) > 3) {
-            $locale = substr($locale, 0, -\strlen(strrchr($locale, '_')));
-        }
-
-        if (isset(self::$rules[$locale])) {
-            $return = self::$rules[$locale]($number);
-
-            if (!\is_int($return) || $return < 0) {
-                return 0;
-            }
-
-            return $return;
-        }
-
-        /*
-         * The plural rules are derived from code of the Zend Framework (2010-09-25),
-         * which is subject to the new BSD license (http://framework.zend.com/license/new-bsd).
-         * Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
-         */
-        switch ($locale) {
-            case 'az':
-            case 'bo':
-            case 'dz':
-            case 'id':
-            case 'ja':
-            case 'jv':
-            case 'ka':
-            case 'km':
-            case 'kn':
-            case 'ko':
-            case 'ms':
-            case 'th':
-            case 'tr':
-            case 'vi':
-            case 'zh':
-                return 0;
-
-            case 'af':
-            case 'bn':
-            case 'bg':
-            case 'ca':
-            case 'da':
-            case 'de':
-            case 'el':
-            case 'en':
-            case 'eo':
-            case 'es':
-            case 'et':
-            case 'eu':
-            case 'fa':
-            case 'fi':
-            case 'fo':
-            case 'fur':
-            case 'fy':
-            case 'gl':
-            case 'gu':
-            case 'ha':
-            case 'he':
-            case 'hu':
-            case 'is':
-            case 'it':
-            case 'ku':
-            case 'lb':
-            case 'ml':
-            case 'mn':
-            case 'mr':
-            case 'nah':
-            case 'nb':
-            case 'ne':
-            case 'nl':
-            case 'nn':
-            case 'no':
-            case 'oc':
-            case 'om':
-            case 'or':
-            case 'pa':
-            case 'pap':
-            case 'ps':
-            case 'pt':
-            case 'so':
-            case 'sq':
-            case 'sv':
-            case 'sw':
-            case 'ta':
-            case 'te':
-            case 'tk':
-            case 'ur':
-            case 'zu':
-                return (1 == $number) ? 0 : 1;
-
-            case 'am':
-            case 'bh':
-            case 'fil':
-            case 'fr':
-            case 'gun':
-            case 'hi':
-            case 'hy':
-            case 'ln':
-            case 'mg':
-            case 'nso':
-            case 'xbr':
-            case 'ti':
-            case 'wa':
-                return ((0 == $number) || (1 == $number)) ? 0 : 1;
-
-            case 'be':
-            case 'bs':
-            case 'hr':
-            case 'ru':
-            case 'sh':
-            case 'sr':
-            case 'uk':
-                return ((1 == $number % 10) && (11 != $number % 100)) ? 0 : ((($number % 10 >= 2) && ($number % 10 <= 4) && (($number % 100 < 10) || ($number % 100 >= 20))) ? 1 : 2);
-
-            case 'cs':
-            case 'sk':
-                return (1 == $number) ? 0 : ((($number >= 2) && ($number <= 4)) ? 1 : 2);
-
-            case 'ga':
-                return (1 == $number) ? 0 : ((2 == $number) ? 1 : 2);
-
-            case 'lt':
-                return ((1 == $number % 10) && (11 != $number % 100)) ? 0 : ((($number % 10 >= 2) && (($number % 100 < 10) || ($number % 100 >= 20))) ? 1 : 2);
-
-            case 'sl':
-                return (1 == $number % 100) ? 0 : ((2 == $number % 100) ? 1 : (((3 == $number % 100) || (4 == $number % 100)) ? 2 : 3));
-
-            case 'mk':
-                return (1 == $number % 10) ? 0 : 1;
-
-            case 'mt':
-                return (1 == $number) ? 0 : (((0 == $number) || (($number % 100 > 1) && ($number % 100 < 11))) ? 1 : ((($number % 100 > 10) && ($number % 100 < 20)) ? 2 : 3));
-
-            case 'lv':
-                return (0 == $number) ? 0 : (((1 == $number % 10) && (11 != $number % 100)) ? 1 : 2);
-
-            case 'pl':
-                return (1 == $number) ? 0 : ((($number % 10 >= 2) && ($number % 10 <= 4) && (($number % 100 < 12) || ($number % 100 > 14))) ? 1 : 2);
-
-            case 'cy':
-                return (1 == $number) ? 0 : ((2 == $number) ? 1 : (((8 == $number) || (11 == $number)) ? 2 : 3));
-
-            case 'ro':
-                return (1 == $number) ? 0 : (((0 == $number) || (($number % 100 > 0) && ($number % 100 < 20))) ? 1 : 2);
-
-            case 'ar':
-                return (0 == $number) ? 0 : ((1 == $number) ? 1 : ((2 == $number) ? 2 : ((($number % 100 >= 3) && ($number % 100 <= 10)) ? 3 : ((($number % 100 >= 11) && ($number % 100 <= 99)) ? 4 : 5))));
-
-            default:
-                return 0;
-        }
-    }
-
-    /**
-     * Overrides the default plural rule for a given locale.
-     *
-     * @param callable $rule   A PHP callable
-     * @param string   $locale The locale
-     */
-    public static function set(callable $rule, $locale)
-    {
-        @trigger_error(sprintf('The "%s" class is deprecated since Symfony 4.2.', __CLASS__), E_USER_DEPRECATED);
-
-        if ('pt_BR' === $locale) {
-            // temporary set a locale for brazilian
-            $locale = 'xbr';
-        }
-
-        if (\strlen($locale) > 3) {
-            $locale = substr($locale, 0, -\strlen(strrchr($locale, '_')));
-        }
-
-        self::$rules[$locale] = $rule;
-    }
-}
diff --git a/src/Symfony/Component/Translation/Tests/DataCollectorTranslatorTest.php b/src/Symfony/Component/Translation/Tests/DataCollectorTranslatorTest.php
index 138172e21d..8433501ee0 100644
--- a/src/Symfony/Component/Translation/Tests/DataCollectorTranslatorTest.php
+++ b/src/Symfony/Component/Translation/Tests/DataCollectorTranslatorTest.php
@@ -79,30 +79,6 @@ class DataCollectorTranslatorTest extends TestCase
         $this->assertEquals($expectedMessages, $collector->getCollectedMessages());
     }
 
-    /**
-     * @group legacy
-     */
-    public function testCollectMessagesTransChoice()
-    {
-        $collector = $this->createCollector();
-        $collector->setFallbackLocales(['fr', 'ru']);
-        $collector->transChoice('choice', 0);
-
-        $expectedMessages = [];
-
-        $expectedMessages[] = [
-              'id' => 'choice',
-              'translation' => 'choice',
-              'locale' => 'en',
-              'domain' => 'messages',
-              'state' => DataCollectorTranslator::MESSAGE_MISSING,
-              'parameters' => ['%count%' => 0],
-              'transChoiceNumber' => 0,
-        ];
-
-        $this->assertEquals($expectedMessages, $collector->getCollectedMessages());
-    }
-
     private function createCollector()
     {
         $translator = new Translator('en');
diff --git a/src/Symfony/Component/Translation/Tests/Extractor/PhpExtractorTest.php b/src/Symfony/Component/Translation/Tests/Extractor/PhpExtractorTest.php
index a6d7c5001c..a8d54d39a5 100644
--- a/src/Symfony/Component/Translation/Tests/Extractor/PhpExtractorTest.php
+++ b/src/Symfony/Component/Translation/Tests/Extractor/PhpExtractorTest.php
@@ -50,7 +50,6 @@ EOF;
                 'single-quoted key with "quote mark at the end"' => 'prefixsingle-quoted key with "quote mark at the end"',
                 $expectedHeredoc => 'prefix'.$expectedHeredoc,
                 $expectedNowdoc => 'prefix'.$expectedNowdoc,
-                '{0} There is no apples|{1} There is one apple|]1,Inf[ There are %count% apples' => 'prefix{0} There is no apples|{1} There is one apple|]1,Inf[ There are %count% apples',
                 'concatenated message with heredoc and nowdoc' => 'prefixconcatenated message with heredoc and nowdoc',
                 'default domain' => 'prefixdefault domain',
             ],
@@ -59,11 +58,7 @@ EOF;
                 'other-domain-test-no-params-long-array' => 'prefixother-domain-test-no-params-long-array',
                 'other-domain-test-params-short-array' => 'prefixother-domain-test-params-short-array',
                 'other-domain-test-params-long-array' => 'prefixother-domain-test-params-long-array',
-                'other-domain-test-trans-choice-short-array-%count%' => 'prefixother-domain-test-trans-choice-short-array-%count%',
-                'other-domain-test-trans-choice-long-array-%count%' => 'prefixother-domain-test-trans-choice-long-array-%count%',
                 'typecast' => 'prefixtypecast',
-                'msg1' => 'prefixmsg1',
-                'msg2' => 'prefixmsg2',
             ],
         ];
         $actualCatalogue = $catalogue->all();
@@ -72,7 +67,7 @@ EOF;
 
         $filename = str_replace(\DIRECTORY_SEPARATOR, '/', __DIR__).'/../fixtures/extractor/translation.html.php';
         $this->assertEquals(['sources' => [$filename.':2']], $catalogue->getMetadata('single-quoted key'));
-        $this->assertEquals(['sources' => [$filename.':43']], $catalogue->getMetadata('other-domain-test-no-params-short-array', 'not_messages'));
+        $this->assertEquals(['sources' => [$filename.':37']], $catalogue->getMetadata('other-domain-test-no-params-short-array', 'not_messages'));
     }
 
     public function resourcesProvider()
diff --git a/src/Symfony/Component/Translation/Tests/Formatter/MessageFormatterTest.php b/src/Symfony/Component/Translation/Tests/Formatter/MessageFormatterTest.php
index 232bcf9043..6e25eed3fe 100644
--- a/src/Symfony/Component/Translation/Tests/Formatter/MessageFormatterTest.php
+++ b/src/Symfony/Component/Translation/Tests/Formatter/MessageFormatterTest.php
@@ -24,15 +24,6 @@ class MessageFormatterTest extends TestCase
         $this->assertEquals($expected, $this->getMessageFormatter()->format($message, 'en', $parameters));
     }
 
-    /**
-     * @dataProvider getTransChoiceMessages
-     * @group legacy
-     */
-    public function testFormatPlural($expected, $message, $number, $parameters)
-    {
-        $this->assertEquals($expected, $this->getMessageFormatter()->choiceFormat($message, $number, 'fr', $parameters));
-    }
-
     public function getTransMessages()
     {
         return [
@@ -53,29 +44,6 @@ class MessageFormatterTest extends TestCase
         ];
     }
 
-    public function getTransChoiceMessages()
-    {
-        return [
-            ['Il y a 0 pomme', '[0,1] Il y a %count% pomme|]1,Inf] Il y a %count% pommes', 0, ['%count%' => 0]],
-            ['Il y a 1 pomme', '[0,1] Il y a %count% pomme|]1,Inf] Il y a %count% pommes', 1, ['%count%' => 1]],
-            ['Il y a 10 pommes', '[0,1] Il y a %count% pomme|]1,Inf] Il y a %count% pommes', 10, ['%count%' => 10]],
-
-            ['Il y a 0 pomme', 'Il y a %count% pomme|Il y a %count% pommes', 0, ['%count%' => 0]],
-            ['Il y a 1 pomme', 'Il y a %count% pomme|Il y a %count% pommes', 1, ['%count%' => 1]],
-            ['Il y a 10 pommes', 'Il y a %count% pomme|Il y a %count% pommes', 10, ['%count%' => 10]],
-
-            ['Il y a 0 pomme', 'one: Il y a %count% pomme|more: Il y a %count% pommes', 0, ['%count%' => 0]],
-            ['Il y a 1 pomme', 'one: Il y a %count% pomme|more: Il y a %count% pommes', 1, ['%count%' => 1]],
-            ['Il y a 10 pommes', 'one: Il y a %count% pomme|more: Il y a %count% pommes', 10, ['%count%' => 10]],
-
-            ['Il n\'y a aucune pomme', '{0} Il n\'y a aucune pomme|one: Il y a %count% pomme|more: Il y a %count% pommes', 0, ['%count%' => 0]],
-            ['Il y a 1 pomme', '{0} Il n\'y a aucune pomme|one: Il y a %count% pomme|more: Il y a %count% pommes', 1, ['%count%' => 1]],
-            ['Il y a 10 pommes', '{0} Il n\'y a aucune pomme|one: Il y a %count% pomme|more: Il y a %count% pommes', 10, ['%count%' => 10]],
-
-            ['Il y a 0 pomme', '[0,1] Il y a %count% pomme|]1,Inf] Il y a %count% pommes', 0, ['%count%' => 0]],
-        ];
-    }
-
     private function getMessageFormatter()
     {
         return new MessageFormatter();
diff --git a/src/Symfony/Component/Translation/Tests/IntervalTest.php b/src/Symfony/Component/Translation/Tests/IntervalTest.php
deleted file mode 100644
index bfd90a2867..0000000000
--- a/src/Symfony/Component/Translation/Tests/IntervalTest.php
+++ /dev/null
@@ -1,52 +0,0 @@
-<?php
-
-/*
- * This file is part of the Symfony package.
- *
- * (c) Fabien Potencier <fabien@symfony.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Symfony\Component\Translation\Tests;
-
-use PHPUnit\Framework\TestCase;
-use Symfony\Component\Translation\Interval;
-
-/**
- * @group legacy
- */
-class IntervalTest extends TestCase
-{
-    /**
-     * @dataProvider getTests
-     */
-    public function testTest($expected, $number, $interval)
-    {
-        $this->assertEquals($expected, Interval::test($number, $interval));
-    }
-
-    /**
-     * @expectedException \Symfony\Component\Translation\Exception\InvalidArgumentException
-     */
-    public function testTestException()
-    {
-        Interval::test(1, 'foobar');
-    }
-
-    public function getTests()
-    {
-        return [
-            [true, 3, '{1,2, 3 ,4}'],
-            [false, 10, '{1,2, 3 ,4}'],
-            [false, 3, '[1,2]'],
-            [true, 1, '[1,2]'],
-            [true, 2, '[1,2]'],
-            [false, 1, ']1,2['],
-            [false, 2, ']1,2['],
-            [true, log(0), '[-Inf,2['],
-            [true, -log(0), '[-2,+Inf]'],
-        ];
-    }
-}
diff --git a/src/Symfony/Component/Translation/Tests/LoggingTranslatorTest.php b/src/Symfony/Component/Translation/Tests/LoggingTranslatorTest.php
index 450e060aab..229398d145 100644
--- a/src/Symfony/Component/Translation/Tests/LoggingTranslatorTest.php
+++ b/src/Symfony/Component/Translation/Tests/LoggingTranslatorTest.php
@@ -12,7 +12,6 @@
 namespace Symfony\Component\Translation\Tests;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Translation\Loader\ArrayLoader;
 use Symfony\Component\Translation\LoggingTranslator;
 use Symfony\Component\Translation\Translator;
 
@@ -30,39 +29,4 @@ class LoggingTranslatorTest extends TestCase
         $loggableTranslator = new LoggingTranslator($translator, $logger);
         $loggableTranslator->trans('bar');
     }
-
-    /**
-     * @group legacy
-     */
-    public function testTransChoiceFallbackIsLogged()
-    {
-        $logger = $this->getMockBuilder('Psr\Log\LoggerInterface')->getMock();
-        $logger->expects($this->once())
-            ->method('debug')
-            ->with('Translation use fallback catalogue.')
-        ;
-
-        $translator = new Translator('ar');
-        $translator->setFallbackLocales(['en']);
-        $translator->addLoader('array', new ArrayLoader());
-        $translator->addResource('array', ['some_message2' => 'one thing|%count% things'], 'en');
-        $loggableTranslator = new LoggingTranslator($translator, $logger);
-        $loggableTranslator->transChoice('some_message2', 10, ['%count%' => 10]);
-    }
-
-    /**
-     * @group legacy
-     */
-    public function testTransChoiceWithNoTranslationIsLogged()
-    {
-        $logger = $this->getMockBuilder('Psr\Log\LoggerInterface')->getMock();
-        $logger->expects($this->exactly(1))
-            ->method('warning')
-            ->with('Translation not found.')
-        ;
-
-        $translator = new Translator('ar');
-        $loggableTranslator = new LoggingTranslator($translator, $logger);
-        $loggableTranslator->transChoice('some_message2', 10, ['%count%' => 10]);
-    }
 }
diff --git a/src/Symfony/Component/Translation/Tests/MessageSelectorTest.php b/src/Symfony/Component/Translation/Tests/MessageSelectorTest.php
deleted file mode 100644
index f099716176..0000000000
--- a/src/Symfony/Component/Translation/Tests/MessageSelectorTest.php
+++ /dev/null
@@ -1,140 +0,0 @@
-<?php
-
-/*
- * This file is part of the Symfony package.
- *
- * (c) Fabien Potencier <fabien@symfony.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Symfony\Component\Translation\Tests;
-
-use PHPUnit\Framework\TestCase;
-use Symfony\Component\Translation\MessageSelector;
-
-/**
- * @group legacy
- */
-class MessageSelectorTest extends TestCase
-{
-    /**
-     * @dataProvider getChooseTests
-     */
-    public function testChoose($expected, $id, $number)
-    {
-        $selector = new MessageSelector();
-
-        $this->assertEquals($expected, $selector->choose($id, $number, 'en'));
-    }
-
-    public function testReturnMessageIfExactlyOneStandardRuleIsGiven()
-    {
-        $selector = new MessageSelector();
-
-        $this->assertEquals('There are two apples', $selector->choose('There are two apples', 2, 'en'));
-    }
-
-    /**
-     * @dataProvider getNonMatchingMessages
-     * @expectedException \Symfony\Component\Translation\Exception\InvalidArgumentException
-     */
-    public function testThrowExceptionIfMatchingMessageCannotBeFound($id, $number)
-    {
-        $selector = new MessageSelector();
-
-        $selector->choose($id, $number, 'en');
-    }
-
-    public function getNonMatchingMessages()
-    {
-        return [
-            ['{0} There are no apples|{1} There is one apple', 2],
-            ['{1} There is one apple|]1,Inf] There are %count% apples', 0],
-            ['{1} There is one apple|]2,Inf] There are %count% apples', 2],
-            ['{0} There are no apples|There is one apple', 2],
-        ];
-    }
-
-    public function getChooseTests()
-    {
-        return [
-            ['There are no apples', '{0} There are no apples|{1} There is one apple|]1,Inf] There are %count% apples', 0],
-            ['There are no apples', '{0}     There are no apples|{1} There is one apple|]1,Inf] There are %count% apples', 0],
-            ['There are no apples', '{0}There are no apples|{1} There is one apple|]1,Inf] There are %count% apples', 0],
-
-            ['There is one apple', '{0} There are no apples|{1} There is one apple|]1,Inf] There are %count% apples', 1],
-
-            ['There are %count% apples', '{0} There are no apples|{1} There is one apple|]1,Inf] There are %count% apples', 10],
-            ['There are %count% apples', '{0} There are no apples|{1} There is one apple|]1,Inf]There are %count% apples', 10],
-            ['There are %count% apples', '{0} There are no apples|{1} There is one apple|]1,Inf]     There are %count% apples', 10],
-
-            ['There are %count% apples', 'There is one apple|There are %count% apples', 0],
-            ['There is one apple', 'There is one apple|There are %count% apples', 1],
-            ['There are %count% apples', 'There is one apple|There are %count% apples', 10],
-
-            ['There are %count% apples', 'one: There is one apple|more: There are %count% apples', 0],
-            ['There is one apple', 'one: There is one apple|more: There are %count% apples', 1],
-            ['There are %count% apples', 'one: There is one apple|more: There are %count% apples', 10],
-
-            ['There are no apples', '{0} There are no apples|one: There is one apple|more: There are %count% apples', 0],
-            ['There is one apple', '{0} There are no apples|one: There is one apple|more: There are %count% apples', 1],
-            ['There are %count% apples', '{0} There are no apples|one: There is one apple|more: There are %count% apples', 10],
-
-            ['', '{0}|{1} There is one apple|]1,Inf] There are %count% apples', 0],
-            ['', '{0} There are no apples|{1}|]1,Inf] There are %count% apples', 1],
-
-            // Indexed only tests which are Gettext PoFile* compatible strings.
-            ['There are %count% apples', 'There is one apple|There are %count% apples', 0],
-            ['There is one apple', 'There is one apple|There are %count% apples', 1],
-            ['There are %count% apples', 'There is one apple|There are %count% apples', 2],
-
-            // Tests for float numbers
-            ['There is almost one apple', '{0} There are no apples|]0,1[ There is almost one apple|{1} There is one apple|[1,Inf] There is more than one apple', 0.7],
-            ['There is one apple', '{0} There are no apples|]0,1[There are %count% apples|{1} There is one apple|[1,Inf] There is more than one apple', 1],
-            ['There is more than one apple', '{0} There are no apples|]0,1[There are %count% apples|{1} There is one apple|[1,Inf] There is more than one apple', 1.7],
-            ['There are no apples', '{0} There are no apples|]0,1[There are %count% apples|{1} There is one apple|[1,Inf] There is more than one apple', 0],
-            ['There are no apples', '{0} There are no apples|]0,1[There are %count% apples|{1} There is one apple|[1,Inf] There is more than one apple', 0.0],
-            ['There are no apples', '{0.0} There are no apples|]0,1[There are %count% apples|{1} There is one apple|[1,Inf] There is more than one apple', 0],
-
-            // Test texts with new-lines
-            // with double-quotes and \n in id & double-quotes and actual newlines in text
-            ["This is a text with a\n            new-line in it. Selector = 0.", '{0}This is a text with a
-            new-line in it. Selector = 0.|{1}This is a text with a
-            new-line in it. Selector = 1.|[1,Inf]This is a text with a
-            new-line in it. Selector > 1.', 0],
-            // with double-quotes and \n in id and single-quotes and actual newlines in text
-            ["This is a text with a\n            new-line in it. Selector = 1.", '{0}This is a text with a
-            new-line in it. Selector = 0.|{1}This is a text with a
-            new-line in it. Selector = 1.|[1,Inf]This is a text with a
-            new-line in it. Selector > 1.', 1],
-            ["This is a text with a\n            new-line in it. Selector > 1.", '{0}This is a text with a
-            new-line in it. Selector = 0.|{1}This is a text with a
-            new-line in it. Selector = 1.|[1,Inf]This is a text with a
-            new-line in it. Selector > 1.', 5],
-            // with double-quotes and id split accros lines
-            ['This is a text with a
-            new-line in it. Selector = 1.', '{0}This is a text with a
-            new-line in it. Selector = 0.|{1}This is a text with a
-            new-line in it. Selector = 1.|[1,Inf]This is a text with a
-            new-line in it. Selector > 1.', 1],
-            // with single-quotes and id split accros lines
-            ['This is a text with a
-            new-line in it. Selector > 1.', '{0}This is a text with a
-            new-line in it. Selector = 0.|{1}This is a text with a
-            new-line in it. Selector = 1.|[1,Inf]This is a text with a
-            new-line in it. Selector > 1.', 5],
-            // with single-quotes and \n in text
-            ['This is a text with a\nnew-line in it. Selector = 0.', '{0}This is a text with a\nnew-line in it. Selector = 0.|{1}This is a text with a\nnew-line in it. Selector = 1.|[1,Inf]This is a text with a\nnew-line in it. Selector > 1.', 0],
-            // with double-quotes and id split accros lines
-            ["This is a text with a\nnew-line in it. Selector = 1.", "{0}This is a text with a\nnew-line in it. Selector = 0.|{1}This is a text with a\nnew-line in it. Selector = 1.|[1,Inf]This is a text with a\nnew-line in it. Selector > 1.", 1],
-            // esacape pipe
-            ['This is a text with | in it. Selector = 0.', '{0}This is a text with || in it. Selector = 0.|{1}This is a text with || in it. Selector = 1.', 0],
-            // Empty plural set (2 plural forms) from a .PO file
-            ['', '|', 1],
-            // Empty plural set (3 plural forms) from a .PO file
-            ['', '||', 1],
-        ];
-    }
-}
diff --git a/src/Symfony/Component/Translation/Tests/PluralizationRulesTest.php b/src/Symfony/Component/Translation/Tests/PluralizationRulesTest.php
deleted file mode 100644
index 696c92b2dd..0000000000
--- a/src/Symfony/Component/Translation/Tests/PluralizationRulesTest.php
+++ /dev/null
@@ -1,124 +0,0 @@
-<?php
-
-/*
- * This file is part of the Symfony package.
- *
- * (c) Fabien Potencier <fabien@symfony.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Symfony\Component\Translation\Tests;
-
-use PHPUnit\Framework\TestCase;
-use Symfony\Component\Translation\PluralizationRules;
-
-/**
- * Test should cover all languages mentioned on http://translate.sourceforge.net/wiki/l10n/pluralforms
- * and Plural forms mentioned on http://www.gnu.org/software/gettext/manual/gettext.html#Plural-forms.
- *
- * See also https://developer.mozilla.org/en/Localization_and_Plurals which mentions 15 rules having a maximum of 6 forms.
- * The mozilla code is also interesting to check for.
- *
- * As mentioned by chx http://drupal.org/node/1273968 we can cover all by testing number from 0 to 199
- *
- * The goal to cover all languages is to far fetched so this test case is smaller.
- *
- * @author Clemens Tolboom clemens@build2be.nl
- *
- * @group legacy
- */
-class PluralizationRulesTest extends TestCase
-{
-    /**
-     * We test failed langcode here.
-     *
-     * TODO: The languages mentioned in the data provide need to get fixed somehow within PluralizationRules.
-     *
-     * @dataProvider failingLangcodes
-     */
-    public function testFailedLangcodes($nplural, $langCodes)
-    {
-        $matrix = $this->generateTestData($langCodes);
-        $this->validateMatrix($nplural, $matrix, false);
-    }
-
-    /**
-     * @dataProvider successLangcodes
-     */
-    public function testLangcodes($nplural, $langCodes)
-    {
-        $matrix = $this->generateTestData($langCodes);
-        $this->validateMatrix($nplural, $matrix);
-    }
-
-    /**
-     * This array should contain all currently known langcodes.
-     *
-     * As it is impossible to have this ever complete we should try as hard as possible to have it almost complete.
-     *
-     * @return array
-     */
-    public function successLangcodes()
-    {
-        return [
-            ['1', ['ay', 'bo', 'cgg', 'dz', 'id', 'ja', 'jbo', 'ka', 'kk', 'km', 'ko', 'ky']],
-            ['2', ['nl', 'fr', 'en', 'de', 'de_GE', 'hy', 'hy_AM']],
-            ['3', ['be', 'bs', 'cs', 'hr']],
-            ['4', ['cy', 'mt', 'sl']],
-            ['6', ['ar']],
-        ];
-    }
-
-    /**
-     * This array should be at least empty within the near future.
-     *
-     * This both depends on a complete list trying to add above as understanding
-     * the plural rules of the current failing languages.
-     *
-     * @return array with nplural together with langcodes
-     */
-    public function failingLangcodes()
-    {
-        return [
-            ['1', ['fa']],
-            ['2', ['jbo']],
-            ['3', ['cbs']],
-            ['4', ['gd', 'kw']],
-            ['5', ['ga']],
-        ];
-    }
-
-    /**
-     * We validate only on the plural coverage. Thus the real rules is not tested.
-     *
-     * @param string $nplural       Plural expected
-     * @param array  $matrix        Containing langcodes and their plural index values
-     * @param bool   $expectSuccess
-     */
-    protected function validateMatrix($nplural, $matrix, $expectSuccess = true)
-    {
-        foreach ($matrix as $langCode => $data) {
-            $indexes = array_flip($data);
-            if ($expectSuccess) {
-                $this->assertEquals($nplural, \count($indexes), "Langcode '$langCode' has '$nplural' plural forms.");
-            } else {
-                $this->assertNotEquals((int) $nplural, \count($indexes), "Langcode '$langCode' has '$nplural' plural forms.");
-            }
-        }
-    }
-
-    protected function generateTestData($langCodes)
-    {
-        $matrix = [];
-        foreach ($langCodes as $langCode) {
-            for ($count = 0; $count < 200; ++$count) {
-                $plural = PluralizationRules::get($count, $langCode);
-                $matrix[$langCode][$count] = $plural;
-            }
-        }
-
-        return $matrix;
-    }
-}
diff --git a/src/Symfony/Component/Translation/Tests/TranslatorTest.php b/src/Symfony/Component/Translation/Tests/TranslatorTest.php
index 51c4a0a048..2c575a1854 100644
--- a/src/Symfony/Component/Translation/Tests/TranslatorTest.php
+++ b/src/Symfony/Component/Translation/Tests/TranslatorTest.php
@@ -391,48 +391,6 @@ class TranslatorTest extends TestCase
         $this->assertEquals($expected, $translator->trans($id, [], '', 'fr'));
     }
 
-    /**
-     * @dataProvider getTransChoiceTests
-     * @group legacy
-     */
-    public function testTransChoice($expected, $id, $translation, $number, $parameters, $locale, $domain)
-    {
-        $translator = new Translator('en');
-        $translator->addLoader('array', new ArrayLoader());
-        $translator->addResource('array', [(string) $id => $translation], $locale, $domain);
-
-        $this->assertEquals($expected, $translator->transChoice($id, $number, $parameters, $domain, $locale));
-    }
-
-    /**
-     * @dataProvider      getInvalidLocalesTests
-     * @expectedException \Symfony\Component\Translation\Exception\InvalidArgumentException
-     * @group legacy
-     */
-    public function testTransChoiceInvalidLocale($locale)
-    {
-        $translator = new Translator('en');
-        $translator->addLoader('array', new ArrayLoader());
-        $translator->addResource('array', ['foo' => 'foofoo'], 'en');
-
-        $translator->transChoice('foo', 1, [], '', $locale);
-    }
-
-    /**
-     * @dataProvider      getValidLocalesTests
-     * @group legacy
-     */
-    public function testTransChoiceValidLocale($locale)
-    {
-        $translator = new Translator('en');
-        $translator->addLoader('array', new ArrayLoader());
-        $translator->addResource('array', ['foo' => 'foofoo'], 'en');
-
-        $translator->transChoice('foo', 1, [], '', $locale);
-        // no assertion. this method just asserts that no exception is thrown
-        $this->addToAssertionCount(1);
-    }
-
     public function getTransFileTests()
     {
         return [
@@ -480,32 +438,6 @@ class TranslatorTest extends TestCase
         ];
     }
 
-    public function getTransChoiceTests()
-    {
-        return [
-            ['Il y a 0 pomme', '{0} There are no appless|{1} There is one apple|]1,Inf] There is %count% apples', '[0,1] Il y a %count% pomme|]1,Inf] Il y a %count% pommes', 0, [], 'fr', ''],
-            ['Il y a 1 pomme', '{0} There are no appless|{1} There is one apple|]1,Inf] There is %count% apples', '[0,1] Il y a %count% pomme|]1,Inf] Il y a %count% pommes', 1, [], 'fr', ''],
-            ['Il y a 10 pommes', '{0} There are no appless|{1} There is one apple|]1,Inf] There is %count% apples', '[0,1] Il y a %count% pomme|]1,Inf] Il y a %count% pommes', 10, [], 'fr', ''],
-
-            ['Il y a 0 pomme', 'There is one apple|There is %count% apples', 'Il y a %count% pomme|Il y a %count% pommes', 0, [], 'fr', ''],
-            ['Il y a 1 pomme', 'There is one apple|There is %count% apples', 'Il y a %count% pomme|Il y a %count% pommes', 1, [], 'fr', ''],
-            ['Il y a 10 pommes', 'There is one apple|There is %count% apples', 'Il y a %count% pomme|Il y a %count% pommes', 10, [], 'fr', ''],
-
-            ['Il y a 0 pomme', 'one: There is one apple|more: There is %count% apples', 'one: Il y a %count% pomme|more: Il y a %count% pommes', 0, [], 'fr', ''],
-            ['Il y a 1 pomme', 'one: There is one apple|more: There is %count% apples', 'one: Il y a %count% pomme|more: Il y a %count% pommes', 1, [], 'fr', ''],
-            ['Il y a 10 pommes', 'one: There is one apple|more: There is %count% apples', 'one: Il y a %count% pomme|more: Il y a %count% pommes', 10, [], 'fr', ''],
-
-            ['Il n\'y a aucune pomme', '{0} There are no apples|one: There is one apple|more: There is %count% apples', '{0} Il n\'y a aucune pomme|one: Il y a %count% pomme|more: Il y a %count% pommes', 0, [], 'fr', ''],
-            ['Il y a 1 pomme', '{0} There are no apples|one: There is one apple|more: There is %count% apples', '{0} Il n\'y a aucune pomme|one: Il y a %count% pomme|more: Il y a %count% pommes', 1, [], 'fr', ''],
-            ['Il y a 10 pommes', '{0} There are no apples|one: There is one apple|more: There is %count% apples', '{0} Il n\'y a aucune pomme|one: Il y a %count% pomme|more: Il y a %count% pommes', 10, [], 'fr', ''],
-
-            ['Il y a 0 pomme', new StringClass('{0} There are no appless|{1} There is one apple|]1,Inf] There is %count% apples'), '[0,1] Il y a %count% pomme|]1,Inf] Il y a %count% pommes', 0, [], 'fr', ''],
-
-            // Override %count% with a custom value
-            ['Il y a quelques pommes', 'one: There is one apple|more: There are %count% apples', 'one: Il y a %count% pomme|more: Il y a quelques pommes', 2, ['%count%' => 'quelques'], 'fr', ''],
-        ];
-    }
-
     public function getInvalidLocalesTests()
     {
         return [
@@ -554,46 +486,6 @@ class TranslatorTest extends TestCase
         $translator->addResource('array', ['some_message' => 'Hi {name}'], 'en', 'messages+intl-icu');
         $this->assertSame('Hi Bob', $translator->trans('some_message', ['%name%' => 'Bob']));
     }
-
-    /**
-     * @group legacy
-     */
-    public function testTransChoiceFallback()
-    {
-        $translator = new Translator('ru');
-        $translator->setFallbackLocales(['en']);
-        $translator->addLoader('array', new ArrayLoader());
-        $translator->addResource('array', ['some_message2' => 'one thing|%count% things'], 'en');
-
-        $this->assertEquals('10 things', $translator->transChoice('some_message2', 10, ['%count%' => 10]));
-    }
-
-    /**
-     * @group legacy
-     */
-    public function testTransChoiceFallbackBis()
-    {
-        $translator = new Translator('ru');
-        $translator->setFallbackLocales(['en_US', 'en']);
-        $translator->addLoader('array', new ArrayLoader());
-        $translator->addResource('array', ['some_message2' => 'one thing|%count% things'], 'en_US');
-
-        $this->assertEquals('10 things', $translator->transChoice('some_message2', 10, ['%count%' => 10]));
-    }
-
-    /**
-     * @group legacy
-     */
-    public function testTransChoiceFallbackWithNoTranslation()
-    {
-        $translator = new Translator('ru');
-        $translator->setFallbackLocales(['en']);
-        $translator->addLoader('array', new ArrayLoader());
-
-        // consistent behavior with Translator::trans(), which returns the string
-        // unchanged if it can't be found
-        $this->assertEquals('some_message2', $translator->transChoice('some_message2', 10, ['%count%' => 10]));
-    }
 }
 
 class StringClass
diff --git a/src/Symfony/Component/Translation/Tests/Writer/TranslationWriterTest.php b/src/Symfony/Component/Translation/Tests/Writer/TranslationWriterTest.php
index d3b6754d33..3ea5ca779f 100644
--- a/src/Symfony/Component/Translation/Tests/Writer/TranslationWriterTest.php
+++ b/src/Symfony/Component/Translation/Tests/Writer/TranslationWriterTest.php
@@ -12,7 +12,6 @@
 namespace Symfony\Component\Translation\Tests\Writer;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Translation\Dumper\DumperInterface;
 use Symfony\Component\Translation\MessageCatalogue;
 use Symfony\Component\Translation\Writer\TranslationWriter;
 
@@ -29,41 +28,4 @@ class TranslationWriterTest extends TestCase
         $writer->addDumper('test', $dumper);
         $writer->write(new MessageCatalogue('en'), 'test');
     }
-
-    /**
-     * @group legacy
-     */
-    public function testDisableBackup()
-    {
-        $nonBackupDumper = new NonBackupDumper();
-        $backupDumper = new BackupDumper();
-
-        $writer = new TranslationWriter();
-        $writer->addDumper('non_backup', $nonBackupDumper);
-        $writer->addDumper('backup', $backupDumper);
-        $writer->disableBackup();
-
-        $this->assertFalse($backupDumper->backup, 'backup can be disabled if setBackup() method does exist');
-    }
-}
-
-class NonBackupDumper implements DumperInterface
-{
-    public function dump(MessageCatalogue $messages, $options = [])
-    {
-    }
-}
-
-class BackupDumper implements DumperInterface
-{
-    public $backup = true;
-
-    public function dump(MessageCatalogue $messages, $options = [])
-    {
-    }
-
-    public function setBackup($backup)
-    {
-        $this->backup = $backup;
-    }
 }
diff --git a/src/Symfony/Component/Translation/Tests/fixtures/extractor/translation.html.php b/src/Symfony/Component/Translation/Tests/fixtures/extractor/translation.html.php
index 5085eab439..a6adda0565 100644
--- a/src/Symfony/Component/Translation/Tests/fixtures/extractor/translation.html.php
+++ b/src/Symfony/Component/Translation/Tests/fixtures/extractor/translation.html.php
@@ -26,12 +26,6 @@ EOF
 
 <?php echo $view['translator']->trans('single-quoted key with "quote mark at the end"'); ?>
 
-<?php echo $view['translator']->transChoice(
-    '{0} There is no apples|{1} There is one apple|]1,Inf[ There are %count% apples',
-    10,
-    ['%count%' => 10]
-); ?>
-
 <?php echo $view['translator']->trans('concatenated'.' message'.<<<EOF
  with heredoc
 EOF
@@ -48,12 +42,6 @@ EOF
 
 <?php echo $view['translator']->trans('other-domain-test-params-long-array', ['foo' => 'bar'], 'not_messages'); ?>
 
-<?php echo $view['translator']->transChoice('other-domain-test-trans-choice-short-array-%count%', 10, ['%count%' => 10], 'not_messages'); ?>
-
-<?php echo $view['translator']->transChoice('other-domain-test-trans-choice-long-array-%count%', 10, ['%count%' => 10], 'not_messages'); ?>
-
 <?php echo $view['translator']->trans('typecast', ['a' => (int) '123'], 'not_messages'); ?>
-<?php echo $view['translator']->transChoice('msg1', 10 + 1, [], 'not_messages'); ?>
-<?php echo $view['translator']->transChoice('msg2', ceil(4.5), [], 'not_messages'); ?>
 
 <?php echo $view['translator']->trans('default domain', [], null); ?>
diff --git a/src/Symfony/Component/Translation/Translator.php b/src/Symfony/Component/Translation/Translator.php
index f5ce39ef0d..3f433e1207 100644
--- a/src/Symfony/Component/Translation/Translator.php
+++ b/src/Symfony/Component/Translation/Translator.php
@@ -15,21 +15,19 @@ use Symfony\Component\Config\ConfigCacheFactory;
 use Symfony\Component\Config\ConfigCacheFactoryInterface;
 use Symfony\Component\Config\ConfigCacheInterface;
 use Symfony\Component\Translation\Exception\InvalidArgumentException;
-use Symfony\Component\Translation\Exception\LogicException;
 use Symfony\Component\Translation\Exception\NotFoundResourceException;
 use Symfony\Component\Translation\Exception\RuntimeException;
-use Symfony\Component\Translation\Formatter\ChoiceMessageFormatterInterface;
 use Symfony\Component\Translation\Formatter\IntlFormatterInterface;
 use Symfony\Component\Translation\Formatter\MessageFormatter;
 use Symfony\Component\Translation\Formatter\MessageFormatterInterface;
 use Symfony\Component\Translation\Loader\LoaderInterface;
-use Symfony\Component\Translation\TranslatorInterface as LegacyTranslatorInterface;
+use Symfony\Contracts\Translation\LocaleAwareInterface;
 use Symfony\Contracts\Translation\TranslatorInterface;
 
 /**
  * @author Fabien Potencier <fabien@symfony.com>
  */
-class Translator implements LegacyTranslatorInterface, TranslatorInterface, TranslatorBagInterface
+class Translator implements TranslatorInterface, TranslatorBagInterface, LocaleAwareInterface
 {
     /**
      * @var MessageCatalogueInterface[]
@@ -219,42 +217,6 @@ class Translator implements LegacyTranslatorInterface, TranslatorInterface, Tran
         return $this->formatter->format($catalogue->get($id, $domain), $locale, $parameters);
     }
 
-    /**
-     * {@inheritdoc}
-     *
-     * @deprecated since Symfony 4.2, use the trans() method instead with a %count% parameter
-     */
-    public function transChoice($id, $number, array $parameters = [], $domain = null, $locale = null)
-    {
-        @trigger_error(sprintf('The "%s()" method is deprecated since Symfony 4.2, use the trans() one instead with a "%%count%%" parameter.', __METHOD__), E_USER_DEPRECATED);
-
-        if (!$this->formatter instanceof ChoiceMessageFormatterInterface) {
-            throw new LogicException(sprintf('The formatter "%s" does not support plural translations.', \get_class($this->formatter)));
-        }
-
-        if (null === $domain) {
-            $domain = 'messages';
-        }
-
-        $id = (string) $id;
-        $catalogue = $this->getCatalogue($locale);
-        $locale = $catalogue->getLocale();
-        while (!$catalogue->defines($id, $domain)) {
-            if ($cat = $catalogue->getFallbackCatalogue()) {
-                $catalogue = $cat;
-                $locale = $catalogue->getLocale();
-            } else {
-                break;
-            }
-        }
-
-        if ($this->hasIntlFormatter && $catalogue->defines($id, $domain.MessageCatalogue::INTL_DOMAIN_SUFFIX)) {
-            return $this->formatter->formatIntl($catalogue->get($id, $domain), $locale, ['%count%' => $number] + $parameters);
-        }
-
-        return $this->formatter->choiceFormat($catalogue->get($id, $domain), $number, $locale, $parameters);
-    }
-
     /**
      * {@inheritdoc}
      */
diff --git a/src/Symfony/Component/Translation/TranslatorInterface.php b/src/Symfony/Component/Translation/TranslatorInterface.php
deleted file mode 100644
index f677d2455f..0000000000
--- a/src/Symfony/Component/Translation/TranslatorInterface.php
+++ /dev/null
@@ -1,70 +0,0 @@
-<?php
-
-/*
- * This file is part of the Symfony package.
- *
- * (c) Fabien Potencier <fabien@symfony.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Symfony\Component\Translation;
-
-use Symfony\Component\Translation\Exception\InvalidArgumentException;
-use Symfony\Contracts\Translation\LocaleAwareInterface;
-
-/**
- * TranslatorInterface.
- *
- * @author Fabien Potencier <fabien@symfony.com>
- *
- * @deprecated since Symfony 4.2, use Symfony\Contracts\Translation\TranslatorInterface instead
- */
-interface TranslatorInterface extends LocaleAwareInterface
-{
-    /**
-     * Translates the given message.
-     *
-     * @param string      $id         The message id (may also be an object that can be cast to string)
-     * @param array       $parameters An array of parameters for the message
-     * @param string|null $domain     The domain for the message or null to use the default
-     * @param string|null $locale     The locale or null to use the default
-     *
-     * @return string The translated string
-     *
-     * @throws InvalidArgumentException If the locale contains invalid characters
-     */
-    public function trans($id, array $parameters = [], $domain = null, $locale = null);
-
-    /**
-     * Translates the given choice message by choosing a translation according to a number.
-     *
-     * @param string      $id         The message id (may also be an object that can be cast to string)
-     * @param int         $number     The number to use to find the index of the message
-     * @param array       $parameters An array of parameters for the message
-     * @param string|null $domain     The domain for the message or null to use the default
-     * @param string|null $locale     The locale or null to use the default
-     *
-     * @return string The translated string
-     *
-     * @throws InvalidArgumentException If the locale contains invalid characters
-     */
-    public function transChoice($id, $number, array $parameters = [], $domain = null, $locale = null);
-
-    /**
-     * Sets the current locale.
-     *
-     * @param string $locale The locale
-     *
-     * @throws InvalidArgumentException If the locale contains invalid characters
-     */
-    public function setLocale($locale);
-
-    /**
-     * Returns the current locale.
-     *
-     * @return string The locale
-     */
-    public function getLocale();
-}
diff --git a/src/Symfony/Component/Translation/Writer/TranslationWriter.php b/src/Symfony/Component/Translation/Writer/TranslationWriter.php
index a44d24c136..d714d57ea1 100644
--- a/src/Symfony/Component/Translation/Writer/TranslationWriter.php
+++ b/src/Symfony/Component/Translation/Writer/TranslationWriter.php
@@ -36,22 +36,6 @@ class TranslationWriter implements TranslationWriterInterface
         $this->dumpers[$format] = $dumper;
     }
 
-    /**
-     * Disables dumper backup.
-     *
-     * @deprecated since Symfony 4.1
-     */
-    public function disableBackup()
-    {
-        @trigger_error(sprintf('The "%s()" method is deprecated since Symfony 4.1.', __METHOD__), E_USER_DEPRECATED);
-
-        foreach ($this->dumpers as $dumper) {
-            if (method_exists($dumper, 'setBackup')) {
-                $dumper->setBackup(false);
-            }
-        }
-    }
-
     /**
      * Obtains the list of supported formats.
      *
diff --git a/src/Symfony/Component/Validator/Violation/ConstraintViolationBuilder.php b/src/Symfony/Component/Validator/Violation/ConstraintViolationBuilder.php
index 0f64ee48f2..bf00471178 100644
--- a/src/Symfony/Component/Validator/Violation/ConstraintViolationBuilder.php
+++ b/src/Symfony/Component/Validator/Violation/ConstraintViolationBuilder.php
@@ -150,27 +150,12 @@ class ConstraintViolationBuilder implements ConstraintViolationBuilderInterface
                 $this->parameters,
                 $this->translationDomain
             );
-        } elseif ($this->translator instanceof TranslatorInterface) {
+        } else {
             $translatedMessage = $this->translator->trans(
                 $this->message,
                 ['%count%' => $this->plural] + $this->parameters,
                 $this->translationDomain
             );
-        } else {
-            try {
-                $translatedMessage = $this->translator->transChoice(
-                    $this->message,
-                    $this->plural,
-                    $this->parameters,
-                    $this->translationDomain
-                );
-            } catch (\InvalidArgumentException $e) {
-                $translatedMessage = $this->translator->trans(
-                    $this->message,
-                    $this->parameters,
-                    $this->translationDomain
-                );
-            }
         }
 
         $this->violations->add(new ConstraintViolation(
diff --git a/src/Symfony/Component/Validator/Violation/ConstraintViolationBuilderInterface.php b/src/Symfony/Component/Validator/Violation/ConstraintViolationBuilderInterface.php
index d25b3a10f9..cb007b6e65 100644
--- a/src/Symfony/Component/Validator/Violation/ConstraintViolationBuilderInterface.php
+++ b/src/Symfony/Component/Validator/Violation/ConstraintViolationBuilderInterface.php
@@ -85,7 +85,7 @@ interface ConstraintViolationBuilderInterface
      *
      * @return $this
      *
-     * @see \Symfony\Contracts\Translation\TranslatorInterface::transChoice()
+     * @see \Symfony\Contracts\Translation\TranslatorInterface::trans()
      */
     public function setPlural($number);