Remove deprecated code

src/Node/Expression/BlockReferenceExpression.php

@@ -22,7 +22,6 @@ use Twig\Node\Node;
  */
 class BlockReferenceExpression extends AbstractExpression implements SupportDefinedTestInterface
 {
-    use SupportDefinedTestDeprecationTrait;
     use SupportDefinedTestTrait;
 
     public function __construct(AbstractExpression $name, ?Node $template, int $lineno)

src/Node/Expression/FunctionExpression.php

@@ -18,7 +18,6 @@ use Twig\TwigFunction;
 
 class FunctionExpression extends CallExpression implements SupportDefinedTestInterface
 {
-    use SupportDefinedTestDeprecationTrait;
     use SupportDefinedTestTrait;
 
     #[FirstClassTwigCallableReady]

src/Node/Expression/GetAttrExpression.php

@@ -19,7 +19,6 @@ use Twig\Template;
 
 class GetAttrExpression extends AbstractExpression implements SupportDefinedTestInterface
 {
-    use SupportDefinedTestDeprecationTrait;
     use SupportDefinedTestTrait;
 
     public function __construct(AbstractExpression $node, AbstractExpression $attribute, ArrayExpression|ContextVariable|null $arguments, string $type, int $lineno)

src/Node/Expression/MacroReferenceExpression.php

@@ -21,7 +21,6 @@ use Twig\Node\Expression\Variable\TemplateVariable;
  */
 class MacroReferenceExpression extends AbstractExpression implements SupportDefinedTestInterface
 {
-    use SupportDefinedTestDeprecationTrait;
     use SupportDefinedTestTrait;
 
     public function __construct(TemplateVariable $template, string $name, AbstractExpression $arguments, int $lineno)

src/Node/Expression/SupportDefinedTestDeprecationTrait.php

@@ -1,44 +0,0 @@
-<?php
-
-/*
- * This file is part of Twig.
- *
- * (c) Fabien Potencier
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Twig\Node\Expression;
-
-/**
- * @internal
- *
- * To be removed in 4.0
- *
- * @author Fabien Potencier <fabien@symfony.com>
- */
-trait SupportDefinedTestDeprecationTrait
-{
-    public function getAttribute($name, $default = null)
-    {
-        if ('is_defined_test' === $name) {
-            trigger_deprecation('twig/twig', '3.21', 'The "is_defined_test" attribute is deprecated, call "isDefinedTestEnabled()" instead.');
-
-            return $this->isDefinedTestEnabled();
-        }
-
-        return parent::getAttribute($name, $default);
-    }
-
-    public function setAttribute(string $name, $value): void
-    {
-        if ('is_defined_test' === $name) {
-            trigger_deprecation('twig/twig', '3.21', 'The "is_defined_test" attribute is deprecated, call "enableDefinedTest()" instead.');
-
-            $this->definedTest = (bool) $value;
-        } else {
-            parent::setAttribute($name, $value);
-        }
-    }
-}

src/Node/Expression/Variable/ContextVariable.php

@@ -13,13 +13,11 @@ namespace Twig\Node\Expression\Variable;
 
 use Twig\Compiler;
 use Twig\Node\Expression\AbstractExpression;
-use Twig\Node\Expression\SupportDefinedTestDeprecationTrait;
 use Twig\Node\Expression\SupportDefinedTestInterface;
 use Twig\Node\Expression\SupportDefinedTestTrait;
 
 class ContextVariable extends AbstractExpression implements SupportDefinedTestInterface
 {
-    use SupportDefinedTestDeprecationTrait;
     use SupportDefinedTestTrait;
 
     private array $specialVars = [