symfony
diff --git a/‎UPGRADE-3.4.md
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diff --git a/‎UPGRADE-4.0.md
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diff --git a/‎src/Symfony/Component/Debug/CHANGELOG.md
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diff --git a/‎src/Symfony/Component/Debug/DebugClassLoader.php
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diff --git a/‎src/Symfony/Component/Debug/ErrorHandler.php
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diff --git a/‎src/Symfony/Component/Debug/Tests/ErrorHandlerTest.php
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@@ -6,6 +6,11 @@ DependencyInjection
 
  * Top-level anonymous services in XML are deprecated and will throw an exception in Symfony 4.0.
 
+Debug
+-----
+
+ * Support for stacked errors in the `ErrorHandler` is deprecated and will be removed in Symfony 4.0.
+
 Finder
 ------
 
 
@@ -70,6 +70,8 @@ Debug
  * `FlattenException::getTrace()` now returns additional type descriptions
    `integer` and `float`.
 
+ * Support for stacked errors in the `ErrorHandler` has been removed
+
 DependencyInjection
 -------------------
 
 
@@ -1,6 +1,11 @@
 CHANGELOG
 =========
 
+3.4.0
+-----
+
+* deprecated `ErrorHandler::stackErrors()` and `ErrorHandler::unstackErrors()`
+
 3.3.0
 -----
 
 
@@ -136,7 +136,7 @@ public static function disable()
      */
     public function loadClass($class)
     {
-        ErrorHandler::stackErrors();
+        $e = error_reporting(error_reporting() | E_PARSE | E_ERROR | E_CORE_ERROR | E_COMPILE_ERROR);
 
         try {
             if ($this->isFinder) {
@@ -148,7 +148,7 @@ public function loadClass($class)
                 $file = false;
             }
         } finally {
-            ErrorHandler::unstackErrors();
+            error_reporting($e);
         }
 
         $exists = class_exists($class, false) || interface_exists($class, false) || trait_exists($class, false);
 
@@ -648,17 +648,25 @@ public static function handleFatalError(array $error = null)
      *
      * The most important feature of this is to prevent
      * autoloading until unstackErrors() is called.
+     *
+     * @deprecated since version 3.4, to be removed in 4.0.
      */
     public static function stackErrors()
     {
+        @trigger_error('Support for stacking errors is deprecated since Symfony 3.4 and will be removed in 4.0.', E_USER_DEPRECATED);
+
         self::$stackedErrorLevels[] = error_reporting(error_reporting() | E_PARSE | E_ERROR | E_CORE_ERROR | E_COMPILE_ERROR);
     }
 
     /**
      * Unstacks stacked errors and forwards to the logger.
+     *
+     * @deprecated since version 3.4, to be removed in 4.0.
      */
     public static function unstackErrors()
     {
+        @trigger_error('Support for unstacking errors is deprecated since Symfony 3.4 and will be removed in 4.0.', E_USER_DEPRECATED);
+
         $level = array_pop(self::$stackedErrorLevels);
 
         if (null !== $level) {
 
@@ -342,6 +342,9 @@ public function testHandleException()
         }
     }
 
+    /**
+     * @group legacy
+     */
     public function testErrorStacking()
     {
         try {
Original file line number	Diff line number	Diff line change
`@@ -136,7 +136,7 @@ public static function disable()`
`136`	`136`	`*/`
`137`	`137`	`public function loadClass($class)`
`138`	`138`	`{`
`139`		`- ErrorHandler::stackErrors();`
	`139`	`+ $e = error_reporting(error_reporting() \| E_PARSE \| E_ERROR \| E_CORE_ERROR \| E_COMPILE_ERROR);`
`140`	`140`
`141`	`141`	`try {`
`142`	`142`	`if ($this->isFinder) {`
`@@ -148,7 +148,7 @@ public function loadClass($class)`
`148`	`148`	`$file = false;`
`149`	`149`	`}`
`150`	`150`	`} finally {`
`151`		`- ErrorHandler::unstackErrors();`
	`151`	`+ error_reporting($e);`
`152`	`152`	`}`
`153`	`153`
`154`	`154`	`$exists = class_exists($class, false) \|\| interface_exists($class, false) \|\| trait_exists($class, false);`
Original file line number	Diff line number	Diff line change
`@@ -342,6 +342,9 @@ public function testHandleException()`
`342`	`342`	`}`
`343`	`343`	`}`
`344`	`344`
	`345`	`+ /**`
	`346`	`+ * @group legacy`
	`347`	`+ */`
`345`	`348`	`public function testErrorStacking()`
`346`	`349`	`{`
`347`	`350`	`try {`