Make sure ContextErrorException is loaded during compile time errors

ErrorHandler.php

@@ -104,6 +104,7 @@ class ErrorHandler
                     $stack = array_map(
                         function ($row) {
                             unset($row['args']);
+
                             return $row;
                         },
                         array_slice(debug_backtrace(false), 0, 10)
@@ -119,6 +120,11 @@ class ErrorHandler
         }
 
         if ($this->displayErrors && error_reporting() & $level && $this->level & $level) {
+            // make sure the ContextErrorException class is loaded (https://bugs.php.net/bug.php?id=65322)
+            if (!class_exists('Symfony\Component\Debug\Exception\ContextErrorException')) {
+                require __DIR__.'/Exception/ContextErrorException.php';
+            }
+
             throw new ContextErrorException(sprintf('%s: %s in %s line %d', isset($this->levels[$level]) ? $this->levels[$level] : $level, $message, $file, $line), 0, $level, $file, $line, $context);
         }
 

Exception/ContextErrorException.php

@@ -19,18 +19,18 @@ namespace Symfony\Component\Debug\Exception;
 class ContextErrorException extends \ErrorException
 {
     private $context = array();
-    
+
     public function __construct($message, $code, $severity, $filename, $lineno, $context = array())
     {
         parent::__construct($message, $code, $severity, $filename, $lineno);
         $this->context = $context;
     }
-    
+
     /**
      * @return array Array of variables that existed when the exception occured
      */
     public function getContext()
     {
         return $this->context;
-    }		
+    }
 }

Tests/ErrorHandlerTest.php

@@ -20,6 +20,31 @@ use Symfony\Component\Debug\ErrorHandler;
  */
 class ErrorHandlerTest extends \PHPUnit_Framework_TestCase
 {
+    public function testCompileTimeError()
+    {
+        // the ContextErrorException must not be loaded for this test to work
+        if (class_exists('Symfony\Component\Debug\Exception\ContextErrorException', false)) {
+            $this->markTestSkipped('The ContextErrorException class is already loaded.');
+        }
+    
+        $handler = ErrorHandler::register(E_ALL | E_STRICT);
+        $displayErrors = ini_get('display_errors');
+        ini_set('display_errors', '1');
+
+        try {
+            // trigger compile time error
+            eval(<<<'PHP'
+class _BaseCompileTimeError { function foo() {} }
+class _CompileTimeError extends _BaseCompileTimeError { function foo($invalid) {} }
+PHP
+            );
+        } catch(\Exception $e) {
+            // if an exception is thrown, the test passed
+        }
+
+        ini_set('display_errors', $displayErrors);
+        restore_error_handler();
+    }
 
     public function testConstruct()
     {