diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/CacheWarmer/ValidatorCacheWarmerTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/CacheWarmer/ValidatorCacheWarmerTest.php
index 868bd83cf7e32..416f4b6123a36 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/CacheWarmer/ValidatorCacheWarmerTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/CacheWarmer/ValidatorCacheWarmerTest.php
@@ -11,6 +11,7 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Tests\CacheWarmer;
 
+use PHPUnit\Framework\Warning;
 use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Bundle\FrameworkBundle\CacheWarmer\ValidatorCacheWarmer;
 use Symfony\Bundle\FrameworkBundle\Tests\TestCase;
@@ -26,6 +27,10 @@ class ValidatorCacheWarmerTest extends TestCase
 
     public function testWarmUp()
     {
+        if (\PHP_VERSION_ID >= 70400) {
+            throw new Warning('PHP 7.4 breaks this test, see https://bugs.php.net/78351.');
+        }
+
         $validatorBuilder = new ValidatorBuilder();
         $validatorBuilder->addXmlMapping(__DIR__.'/../Fixtures/Validation/Resources/person.xml');
         $validatorBuilder->addYamlMapping(__DIR__.'/../Fixtures/Validation/Resources/author.yml');
diff --git a/src/Symfony/Component/Config/Tests/Resource/ClassExistenceResourceTest.php b/src/Symfony/Component/Config/Tests/Resource/ClassExistenceResourceTest.php
index 79bc64d69b9ad..5612e7ca24636 100644
--- a/src/Symfony/Component/Config/Tests/Resource/ClassExistenceResourceTest.php
+++ b/src/Symfony/Component/Config/Tests/Resource/ClassExistenceResourceTest.php
@@ -12,6 +12,7 @@
 namespace Symfony\Component\Config\Tests\Resource;
 
 use PHPUnit\Framework\TestCase;
+use PHPUnit\Framework\Warning;
 use Symfony\Component\Config\Resource\ClassExistenceResource;
 use Symfony\Component\Config\Tests\Fixtures\BadParent;
 use Symfony\Component\Config\Tests\Fixtures\Resource\ConditionalClass;
@@ -77,6 +78,10 @@ public function testExistsKo()
 
     public function testBadParentWithTimestamp()
     {
+        if (\PHP_VERSION_ID >= 70400) {
+            throw new Warning('PHP 7.4 breaks this test, see https://bugs.php.net/78351.');
+        }
+
         $res = new ClassExistenceResource(BadParent::class, false);
         $this->assertTrue($res->isFresh(time()));
     }
@@ -87,6 +92,10 @@ public function testBadParentWithTimestamp()
      */
     public function testBadParentWithNoTimestamp()
     {
+        if (\PHP_VERSION_ID >= 70400) {
+            throw new Warning('PHP 7.4 breaks this test, see https://bugs.php.net/78351.');
+        }
+
         $res = new ClassExistenceResource(BadParent::class, false);
         $res->isFresh(0);
     }
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Compiler/AutowirePassTest.php b/src/Symfony/Component/DependencyInjection/Tests/Compiler/AutowirePassTest.php
index 31fa665ae7a85..85979f367e353 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Compiler/AutowirePassTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Compiler/AutowirePassTest.php
@@ -12,6 +12,7 @@
 namespace Symfony\Component\DependencyInjection\Tests\Compiler;
 
 use PHPUnit\Framework\TestCase;
+use PHPUnit\Framework\Warning;
 use Symfony\Component\Config\FileLocator;
 use Symfony\Component\DependencyInjection\Compiler\AutowirePass;
 use Symfony\Component\DependencyInjection\Compiler\AutowireRequiredMethodsPass;
@@ -395,6 +396,10 @@ public function testClassNotFoundThrowsException()
      */
     public function testParentClassNotFoundThrowsException()
     {
+        if (\PHP_VERSION_ID >= 70400) {
+            throw new Warning('PHP 7.4 breaks this test, see https://bugs.php.net/78351.');
+        }
+
         $container = new ContainerBuilder();
 
         $aDefinition = $container->register('a', __NAMESPACE__.'\BadParentTypeHintedArgument');
@@ -707,6 +712,10 @@ public function getCreateResourceTests()
 
     public function testIgnoreServiceWithClassNotExisting()
     {
+        if (\PHP_VERSION_ID >= 70400) {
+            throw new Warning('PHP 7.4 breaks this test, see https://bugs.php.net/78351.');
+        }
+
         $container = new ContainerBuilder();
 
         $container->register('class_not_exist', __NAMESPACE__.'\OptionalServiceClass');
@@ -917,6 +926,10 @@ public function testExceptionWhenAliasExists()
      */
     public function testExceptionWhenAliasDoesNotExist()
     {
+        if (\PHP_VERSION_ID >= 70400) {
+            throw new Warning('PHP 7.4 breaks this test, see https://bugs.php.net/78351.');
+        }
+
         $container = new ContainerBuilder();
 
         // multiple I instances... but no IInterface alias
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Compiler/ResolveBindingsPassTest.php b/src/Symfony/Component/DependencyInjection/Tests/Compiler/ResolveBindingsPassTest.php
index 7bbecf6207f46..303e3abd49354 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Compiler/ResolveBindingsPassTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Compiler/ResolveBindingsPassTest.php
@@ -12,6 +12,7 @@
 namespace Symfony\Component\DependencyInjection\Tests\Compiler;
 
 use PHPUnit\Framework\TestCase;
+use PHPUnit\Framework\Warning;
 use Symfony\Component\DependencyInjection\Argument\BoundArgument;
 use Symfony\Component\DependencyInjection\Compiler\AutowireRequiredMethodsPass;
 use Symfony\Component\DependencyInjection\Compiler\ResolveBindingsPass;
@@ -69,6 +70,10 @@ public function testUnusedBinding()
      */
     public function testMissingParent()
     {
+        if (\PHP_VERSION_ID >= 70400) {
+            throw new Warning('PHP 7.4 breaks this test, see https://bugs.php.net/78351.');
+        }
+
         $container = new ContainerBuilder();
 
         $definition = $container->register(ParentNotExists::class, ParentNotExists::class);
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Dumper/PhpDumperTest.php b/src/Symfony/Component/DependencyInjection/Tests/Dumper/PhpDumperTest.php
index b4e361077308b..6a5cff1089fb3 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Dumper/PhpDumperTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Dumper/PhpDumperTest.php
@@ -12,6 +12,7 @@
 namespace Symfony\Component\DependencyInjection\Tests\Dumper;
 
 use PHPUnit\Framework\TestCase;
+use PHPUnit\Framework\Warning;
 use Psr\Container\ContainerInterface;
 use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\Config\FileLocator;
@@ -906,6 +907,10 @@ public function testInlineSelfRef()
 
     public function testHotPathOptimizations()
     {
+        if (\PHP_VERSION_ID >= 70400) {
+            throw new Warning('PHP 7.4 breaks this test, see https://bugs.php.net/78351.');
+        }
+
         $container = include self::$fixturesPath.'/containers/container_inline_requires.php';
         $container->setParameter('inline_requires', true);
         $container->compile();
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Loader/FileLoaderTest.php b/src/Symfony/Component/DependencyInjection/Tests/Loader/FileLoaderTest.php
index ee102c75bbbc9..8493642b4c84b 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Loader/FileLoaderTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Loader/FileLoaderTest.php
@@ -12,6 +12,7 @@
 namespace Symfony\Component\DependencyInjection\Tests\Loader;
 
 use PHPUnit\Framework\TestCase;
+use PHPUnit\Framework\Warning;
 use Psr\Container\ContainerInterface as PsrContainerInterface;
 use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 use Symfony\Component\Config\FileLocator;
@@ -112,6 +113,10 @@ public function testRegisterClasses()
 
     public function testRegisterClassesWithExclude()
     {
+        if (\PHP_VERSION_ID >= 70400) {
+            throw new Warning('PHP 7.4 breaks this test, see https://bugs.php.net/78351.');
+        }
+
         $container = new ContainerBuilder();
         $container->setParameter('other_dir', 'OtherDir');
         $loader = new TestFileLoader($container, new FileLocator(self::$fixturesPath.'/Fixtures'));
@@ -141,6 +146,10 @@ public function testRegisterClassesWithExclude()
 
     public function testNestedRegisterClasses()
     {
+        if (\PHP_VERSION_ID >= 70400) {
+            throw new Warning('PHP 7.4 breaks this test, see https://bugs.php.net/78351.');
+        }
+
         $container = new ContainerBuilder();
         $loader = new TestFileLoader($container, new FileLocator(self::$fixturesPath.'/Fixtures'));
 
@@ -169,6 +178,10 @@ public function testNestedRegisterClasses()
 
     public function testMissingParentClass()
     {
+        if (\PHP_VERSION_ID >= 70400) {
+            throw new Warning('PHP 7.4 breaks this test, see https://bugs.php.net/78351.');
+        }
+
         $container = new ContainerBuilder();
         $container->setParameter('bad_classes_dir', 'BadClasses');
         $loader = new TestFileLoader($container, new FileLocator(self::$fixturesPath.'/Fixtures'));

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