Leverage trigger_deprecation() from symfony/deprecation-contracts

Author: nicolas-grekas

Extension/Core/Type/FormType.php

@@ -61,7 +61,7 @@ public function buildForm(FormBuilderInterface $builder, array $options)
         }
 
         if (!method_exists($builder, 'setIsEmptyCallback')) {
-            @trigger_error(sprintf('Not implementing the "%s::setIsEmptyCallback()" method in "%s" is deprecated since Symfony 5.1.', FormConfigBuilderInterface::class, \get_class($builder)), E_USER_DEPRECATED);
+            trigger_deprecation('symfony/form', '5.1', 'Not implementing the "%s::setIsEmptyCallback()" method in "%s" is deprecated.', FormConfigBuilderInterface::class, \get_class($builder));
 
             return;
         }

Form.php

@@ -727,7 +727,7 @@ public function isEmpty()
         }
 
         if (!method_exists($this->config, 'getIsEmptyCallback')) {
-            @trigger_error(sprintf('Not implementing the "%s::getIsEmptyCallback()" method in "%s" is deprecated since Symfony 5.1.', FormConfigInterface::class, \get_class($this->config)), E_USER_DEPRECATED);
+            trigger_deprecation('symfony/form', '5.1', 'Not implementing the "%s::getIsEmptyCallback()" method in "%s" is deprecated.', FormConfigInterface::class, \get_class($this->config));
 
             $isEmptyCallback = null;
         } else {

composer.json

@@ -17,6 +17,7 @@
     ],
     "require": {
         "php": "^7.2.5",
+        "symfony/deprecation-contracts": "^2.1",
         "symfony/event-dispatcher": "^4.4|^5.0",
         "symfony/intl": "^4.4|^5.0",
         "symfony/options-resolver": "^5.0",