symfony
diff --git a/‎src/Symfony/Component/Validator/Constraint.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/Validator/Constraint.php
+10Lines changed: 10 additions & 0 deletions b/‎src/Symfony/Component/Validator/Constraint.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/Validator/Constraint.php
+10Lines changed: 10 additions & 0 deletions
diff --git a/‎src/Symfony/Component/Validator/Tests/Constraints/FileTest.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/Validator/Tests/Constraints/FileTest.php
+10Lines changed: 10 additions & 0 deletions b/‎src/Symfony/Component/Validator/Tests/Constraints/FileTest.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/Validator/Tests/Constraints/FileTest.php
+10Lines changed: 10 additions & 0 deletions
@@ -214,6 +214,16 @@ public function __get($option)
         throw new InvalidOptionsException(sprintf('The option "%s" does not exist in constraint %s', $option, get_class($this)), array($option));
     }
 
+    /**
+     * @param string $option The option name
+     *
+     * @return bool
+     */
+    public function __isset($option)
+    {
+        return 'groups' === $option;
+    }
+
     /**
      * Adds the given group if this constraint is in the Default group.
      *
 
@@ -26,6 +26,16 @@ public function testMaxSize($maxSize, $bytes, $binaryFormat)
 
         $this->assertSame($bytes, $file->maxSize);
         $this->assertSame($binaryFormat, $file->binaryFormat);
+        $this->assertTrue($file->__isset('maxSize'));
+    }
+
+    public function testMagicIsset()
+    {
+        $file = new File(array('maxSize' => 1));
+
+        $this->assertTrue($file->__isset('maxSize'));
+        $this->assertTrue($file->__isset('groups'));
+        $this->assertFalse($file->__isset('toto'));
     }
 
     /**