Issue #3262853 by longwave, daffie: [Symfony 6] Drop support for services as container parameters

core/lib/Drupal/Component/DependencyInjection/Dumper/OptimizedPhpArrayDumper.php

@@ -156,9 +156,6 @@ protected function prepareParameters(array $parameters, $escape = TRUE) {
       if (is_array($value)) {
         $value = $this->prepareParameters($value, $escape);
       }
-      elseif ($value instanceof Reference) {
-        $value = $this->dumpValue($value);
-      }
 
       $filtered[$key] = $value;
     }

core/tests/Drupal/Tests/Component/DependencyInjection/Dumper/OptimizedPhpArrayDumperTest.php

@@ -152,12 +152,6 @@ public function testGetParameters($parameters, $definition_parameters, $is_froze
       $this->containerBuilder->getParameterBag()->willReturn($parameter_bag);
       $this->containerBuilder->isCompiled()->willReturn($is_frozen);
 
-      if (isset($parameters['reference'])) {
-        $definition = new Definition('\stdClass');
-        $definition->setPublic(TRUE);
-        $this->containerBuilder->getDefinition('referenced_service')->willReturn($definition);
-      }
-
       $this->assertEquals($this->containerDefinition, $this->dumper->getArray(), 'Expected definition matches dump.');
     }
 
@@ -193,11 +187,6 @@ public function getParametersDataProvider() {
           ['foo' => '%llama%', 'llama' => 'yes'],
           FALSE,
         ],
-        [
-          ['reference' => new Reference('referenced_service')],
-          ['reference' => $this->getServiceCall('referenced_service')],
-          TRUE,
-        ],
       ];
     }