Silence invasive deprecation warnings, opt-in for warnings

DebugClassLoader.php

@@ -45,7 +45,7 @@ class DebugClassLoader
         $this->wasFinder = is_object($classLoader) && method_exists($classLoader, 'findFile');
 
         if ($this->wasFinder) {
-            trigger_error('The '.__METHOD__.' method will no longer support receiving an object into its $classLoader argument in 3.0.', E_USER_DEPRECATED);
+            @trigger_error('The '.__METHOD__.' method will no longer support receiving an object into its $classLoader argument in 3.0.', E_USER_DEPRECATED);
             $this->classLoader = array($classLoader, 'loadClass');
             $this->isFinder = true;
         } else {
@@ -127,7 +127,7 @@ class DebugClassLoader
      */
     public function findFile($class)
     {
-        trigger_error('The '.__METHOD__.' method is deprecated since version 2.5 and will be removed in 3.0.', E_USER_DEPRECATED);
+        @trigger_error('The '.__METHOD__.' method is deprecated since version 2.5 and will be removed in 3.0.', E_USER_DEPRECATED);
 
         if ($this->wasFinder) {
             return $this->classLoader[0]->findFile($class);
@@ -200,12 +200,12 @@ class DebugClassLoader
 
                 if (!$parent || strncmp($ns, $parent->name, $len)) {
                     if ($parent && isset(self::$deprecated[$parent->name]) && strncmp($ns, $parent->name, $len)) {
-                        trigger_error(sprintf('The %s class extends %s that is deprecated %s', $name, $parent->name, self::$deprecated[$parent->name]), E_USER_DEPRECATED);
+                        @trigger_error(sprintf('The %s class extends %s that is deprecated %s', $name, $parent->name, self::$deprecated[$parent->name]), E_USER_DEPRECATED);
                     }
 
                     foreach ($refl->getInterfaceNames() as $interface) {
                         if (isset(self::$deprecated[$interface]) && strncmp($ns, $interface, $len) && !($parent && $parent->implementsInterface($interface))) {
-                            trigger_error(sprintf('The %s %s %s that is deprecated %s', $name, $refl->isInterface() ? 'interface extends' : 'class implements', $interface, self::$deprecated[$interface]), E_USER_DEPRECATED);
+                            @trigger_error(sprintf('The %s %s %s that is deprecated %s', $name, $refl->isInterface() ? 'interface extends' : 'class implements', $interface, self::$deprecated[$interface]), E_USER_DEPRECATED);
                         }
                     }
                 }

ErrorHandler.php

@@ -611,7 +611,7 @@ class ErrorHandler
      */
     public function setLevel($level)
     {
-        trigger_error('The '.__METHOD__.' method is deprecated since version 2.6 and will be removed in 3.0. Use the throwAt() method instead.', E_USER_DEPRECATED);
+        @trigger_error('The '.__METHOD__.' method is deprecated since version 2.6 and will be removed in 3.0. Use the throwAt() method instead.', E_USER_DEPRECATED);
 
         $level = null === $level ? error_reporting() : $level;
         $this->throwAt($level, true);
@@ -626,7 +626,7 @@ class ErrorHandler
      */
     public function setDisplayErrors($displayErrors)
     {
-        trigger_error('The '.__METHOD__.' method is deprecated since version 2.6 and will be removed in 3.0. Use the throwAt() method instead.', E_USER_DEPRECATED);
+        @trigger_error('The '.__METHOD__.' method is deprecated since version 2.6 and will be removed in 3.0. Use the throwAt() method instead.', E_USER_DEPRECATED);
 
         if ($displayErrors) {
             $this->throwAt($this->displayErrors, true);
@@ -647,7 +647,7 @@ class ErrorHandler
      */
     public static function setLogger(LoggerInterface $logger, $channel = 'deprecation')
     {
-        trigger_error('The '.__METHOD__.' static method is deprecated since version 2.6 and will be removed in 3.0. Use the setLoggers() or setDefaultLogger() methods instead.', E_USER_DEPRECATED);
+        @trigger_error('The '.__METHOD__.' static method is deprecated since version 2.6 and will be removed in 3.0. Use the setLoggers() or setDefaultLogger() methods instead.', E_USER_DEPRECATED);
 
         $handler = set_error_handler('var_dump', 0);
         $handler = is_array($handler) ? $handler[0] : null;
@@ -684,7 +684,7 @@ class ErrorHandler
      */
     public function handleFatal()
     {
-        trigger_error('The '.__METHOD__.' method is deprecated since version 2.6 and will be removed in 3.0. Use the handleFatalError() method instead.', E_USER_DEPRECATED);
+        @trigger_error('The '.__METHOD__.' method is deprecated since version 2.6 and will be removed in 3.0. Use the handleFatalError() method instead.', E_USER_DEPRECATED);
 
         static::handleFatalError();
     }

Exception/DummyException.php

@@ -11,7 +11,7 @@
 
 namespace Symfony\Component\Debug\Exception;
 
-trigger_error('The '.__NAMESPACE__.'\DummyException class is deprecated since version 2.5 and will be removed in 3.0.', E_USER_DEPRECATED);
+@trigger_error('The '.__NAMESPACE__.'\DummyException class is deprecated since version 2.5 and will be removed in 3.0.', E_USER_DEPRECATED);
 
 /**
  * @author Fabien Potencier <fabien@symfony.com>

ExceptionHandler.php

@@ -428,7 +428,7 @@ EOF;
      */
     protected static function utf8Htmlize($str)
     {
-        trigger_error('The '.__METHOD__.' method is deprecated since version 2.7 and will be removed in 3.0.', E_USER_DEPRECATED);
+        @trigger_error('The '.__METHOD__.' method is deprecated since version 2.7 and will be removed in 3.0.', E_USER_DEPRECATED);
 
         return htmlspecialchars($str, ENT_QUOTES | (PHP_VERSION_ID >= 50400 ? ENT_SUBSTITUTE : 0), 'UTF-8');
     }