diff --git a/src/Symfony/Component/VarDumper/Caster/EnumStub.php b/src/Symfony/Component/VarDumper/Caster/EnumStub.php
new file mode 100644
index 0000000000000..67bb2e1639031
--- /dev/null
+++ b/src/Symfony/Component/VarDumper/Caster/EnumStub.php
@@ -0,0 +1,27 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\VarDumper\Caster;
+
+use Symfony\Component\VarDumper\Cloner\Stub;
+
+/**
+ * Represents an enumeration of values.
+ *
+ * @author Nicolas Grekas <p@tchwork.com>
+ */
+class EnumStub extends Stub
+{
+    public function __construct(array $values)
+    {
+        $this->value = $values;
+    }
+}
diff --git a/src/Symfony/Component/VarDumper/Caster/PdoCaster.php b/src/Symfony/Component/VarDumper/Caster/PdoCaster.php
index 48c5306985c09..e60b9275fd89f 100644
--- a/src/Symfony/Component/VarDumper/Caster/PdoCaster.php
+++ b/src/Symfony/Component/VarDumper/Caster/PdoCaster.php
@@ -82,7 +82,7 @@ public static function castPdo(\PDO $c, array $a, Stub $stub, $isNested)
         $a += array(
             $prefix.'inTransaction' => method_exists($c, 'inTransaction'),
             $prefix.'errorInfo' => $c->errorInfo(),
-            $prefix.'attributes' => $attr,
+            $prefix.'attributes' => new EnumStub($attr),
         );
 
         if ($a[$prefix.'inTransaction']) {
diff --git a/src/Symfony/Component/VarDumper/Caster/PgSqlCaster.php b/src/Symfony/Component/VarDumper/Caster/PgSqlCaster.php
index 17b86456beab4..88414e4ccff26 100644
--- a/src/Symfony/Component/VarDumper/Caster/PgSqlCaster.php
+++ b/src/Symfony/Component/VarDumper/Caster/PgSqlCaster.php
@@ -101,6 +101,7 @@ public static function castLink($link, array $a, Stub $stub, $isNested)
         }
 
         $a['param']['client_encoding'] = pg_client_encoding($link);
+        $a['param'] = new EnumStub($a['param']);
 
         return $a;
     }
@@ -145,7 +146,7 @@ public static function castResult($result, array $a, Stub $stub, $isNested)
             if ('1 chars' === $field['display']) {
                 $field['display'] = '1 char';
             }
-            $a['fields'][] = $field;
+            $a['fields'][] = new EnumStub($field);
         }
 
         return $a;
diff --git a/src/Symfony/Component/VarDumper/Caster/ReflectionCaster.php b/src/Symfony/Component/VarDumper/Caster/ReflectionCaster.php
index 48c5fd6f3672c..8cdd68aa36056 100644
--- a/src/Symfony/Component/VarDumper/Caster/ReflectionCaster.php
+++ b/src/Symfony/Component/VarDumper/Caster/ReflectionCaster.php
@@ -51,15 +51,15 @@ public static function castClosure(\Closure $c, array $a, Stub $stub, $isNested)
         $a = static::castFunctionAbstract($c, $a, $stub, $isNested);
 
         if (isset($a[$prefix.'parameters'])) {
-            foreach ($a[$prefix.'parameters'] as &$v) {
+            foreach ($a[$prefix.'parameters']->value as &$v) {
                 $param = $v;
-                $v = array();
+                $v = new EnumStub(array());
                 foreach (static::castParameter($param, array(), $stub, true) as $k => $param) {
                     if ("\0" === $k[0]) {
-                        $v[substr($k, 3)] = $param;
+                        $v->value[substr($k, 3)] = $param;
                     }
                 }
-                unset($v['position'], $v['isVariadic'], $v['byReference'], $v);
+                unset($v->value['position'], $v->value['isVariadic'], $v->value['byReference'], $v);
             }
         }
 
@@ -128,18 +128,25 @@ public static function castFunctionAbstract(\ReflectionFunctionAbstract $c, arra
             }
             $a[$prefix.'parameters'][$k] = $v;
         }
+        if (isset($a[$prefix.'parameters'])) {
+            $a[$prefix.'parameters'] = new EnumStub($a[$prefix.'parameters']);
+        }
 
         if ($v = $c->getStaticVariables()) {
             foreach ($v as $k => &$v) {
                 $a[$prefix.'use']['$'.$k] = &$v;
             }
             unset($v);
+            $a[$prefix.'use'] = new EnumStub($a[$prefix.'use']);
         }
 
         if (!($filter & Caster::EXCLUDE_VERBOSE) && !$isNested) {
             self::addExtra($a, $c);
         }
 
+        // Added by HHVM
+        unset($a[Caster::PREFIX_DYNAMIC.'static']);
+
         return $a;
     }
 
@@ -220,14 +227,18 @@ public static function castZendExtension(\ReflectionZendExtension $c, array $a,
 
     private static function addExtra(&$a, \Reflector $c)
     {
-        $a = &$a[Caster::PREFIX_VIRTUAL.'extra'];
+        $x = isset($a[Caster::PREFIX_VIRTUAL.'extra']) ? $a[Caster::PREFIX_VIRTUAL.'extra']->value : array();
 
         if (method_exists($c, 'getFileName') && $m = $c->getFileName()) {
-            $a['file'] = $m;
-            $a['line'] = $c->getStartLine().' to '.$c->getEndLine();
+            $x['file'] = $m;
+            $x['line'] = $c->getStartLine().' to '.$c->getEndLine();
         }
 
-        self::addMap($a, $c, self::$extraMap, '');
+        self::addMap($x, $c, self::$extraMap, '');
+
+        if ($x) {
+            $a[Caster::PREFIX_VIRTUAL.'extra'] = new EnumStub($x);
+        }
     }
 
     private static function addMap(&$a, \Reflector $c, $map, $prefix = Caster::PREFIX_VIRTUAL)
diff --git a/src/Symfony/Component/VarDumper/Caster/StubCaster.php b/src/Symfony/Component/VarDumper/Caster/StubCaster.php
index 542f8a19f4afb..0b90358726a3a 100644
--- a/src/Symfony/Component/VarDumper/Caster/StubCaster.php
+++ b/src/Symfony/Component/VarDumper/Caster/StubCaster.php
@@ -48,4 +48,24 @@ public static function cutInternals($obj, array $a, Stub $stub, $isNested)
 
         return $a;
     }
+
+    public static function castEnum(EnumStub $c, array $a, Stub $stub, $isNested)
+    {
+        if ($isNested) {
+            $stub->class = '';
+            $stub->handle = 0;
+
+            $a = array();
+
+            if ($c->value) {
+                foreach (array_keys($c->value) as $k) {
+                    $keys[] = Caster::PREFIX_VIRTUAL.$k;
+                }
+                // Preserve references with array_combine()
+                $a = array_combine($keys, $c->value);
+            }
+        }
+
+        return $a;
+    }
 }
diff --git a/src/Symfony/Component/VarDumper/Cloner/AbstractCloner.php b/src/Symfony/Component/VarDumper/Cloner/AbstractCloner.php
index 9d86fd2f36644..c8f9eb6258498 100644
--- a/src/Symfony/Component/VarDumper/Cloner/AbstractCloner.php
+++ b/src/Symfony/Component/VarDumper/Cloner/AbstractCloner.php
@@ -25,6 +25,7 @@ abstract class AbstractCloner implements ClonerInterface
         'Symfony\Component\VarDumper\Caster\CutStub' => 'Symfony\Component\VarDumper\Caster\StubCaster::castStub',
         'Symfony\Component\VarDumper\Caster\CutArrayStub' => 'Symfony\Component\VarDumper\Caster\StubCaster::castCutArray',
         'Symfony\Component\VarDumper\Caster\ConstStub' => 'Symfony\Component\VarDumper\Caster\StubCaster::castStub',
+        'Symfony\Component\VarDumper\Caster\EnumStub' => 'Symfony\Component\VarDumper\Caster\StubCaster::castEnum',
 
         'Closure' => 'Symfony\Component\VarDumper\Caster\ReflectionCaster::castClosure',
         'ReflectionClass' => 'Symfony\Component\VarDumper\Caster\ReflectionCaster::castClass',
diff --git a/src/Symfony/Component/VarDumper/Dumper/CliDumper.php b/src/Symfony/Component/VarDumper/Dumper/CliDumper.php
index 1fcad90c8740b..26414b55a8aba 100644
--- a/src/Symfony/Component/VarDumper/Dumper/CliDumper.php
+++ b/src/Symfony/Component/VarDumper/Dumper/CliDumper.php
@@ -247,7 +247,7 @@ public function enterHash(Cursor $cursor, $type, $class, $hasChild)
             $class = $this->utf8Encode($class);
         }
         if (Cursor::HASH_OBJECT === $type) {
-            $prefix = 'stdClass' !== $class ? $this->style('note', $class).' {' : '{';
+            $prefix = $class && 'stdClass' !== $class ? $this->style('note', $class).' {' : '{';
         } elseif (Cursor::HASH_RESOURCE === $type) {
             $prefix = $this->style('note', $class.' resource').($hasChild ? ' {' : ' ');
         } else {
diff --git a/src/Symfony/Component/VarDumper/Tests/Caster/PdoCasterTest.php b/src/Symfony/Component/VarDumper/Tests/Caster/PdoCasterTest.php
index 445b712ec9d98..3f4f94fc3d1a3 100644
--- a/src/Symfony/Component/VarDumper/Tests/Caster/PdoCasterTest.php
+++ b/src/Symfony/Component/VarDumper/Tests/Caster/PdoCasterTest.php
@@ -29,8 +29,10 @@ public function testCastPdo()
         $pdo->setAttribute(\PDO::ATTR_STATEMENT_CLASS, array('PDOStatement', array($pdo)));
 
         $cast = PdoCaster::castPdo($pdo, array(), new Stub(), false);
-        $attr = $cast["\0~\0attributes"];
 
+        $this->assertInstanceOf('Symfony\Component\VarDumper\Caster\EnumStub', $cast["\0~\0attributes"]);
+
+        $attr = $cast["\0~\0attributes"] = $cast["\0~\0attributes"]->value;
         $this->assertInstanceOf('Symfony\Component\VarDumper\Caster\ConstStub', $attr['CASE']);
         $this->assertSame('NATURAL', $attr['CASE']->class);
         $this->assertSame('BOTH', $attr['DEFAULT_FETCH_MODE']->class);
diff --git a/src/Symfony/Component/VarDumper/Tests/Caster/ReflectionCasterTest.php b/src/Symfony/Component/VarDumper/Tests/Caster/ReflectionCasterTest.php
index 0fcc7e26bb36a..9bb18723b327d 100644
--- a/src/Symfony/Component/VarDumper/Tests/Caster/ReflectionCasterTest.php
+++ b/src/Symfony/Component/VarDumper/Tests/Caster/ReflectionCasterTest.php
@@ -39,7 +39,6 @@ public function testReflectionCaster()
 %A    +name: "name"
       +class: "ReflectionClass"
 %A    modifiers: "public"
-      extra: null
     }
 %A]
   methods: array:%d [
@@ -47,15 +46,34 @@ public function testReflectionCaster()
     "export" => ReflectionMethod {
       +name: "export"
       +class: "ReflectionClass"
-      parameters: array:2 [
-        "$%s" => ReflectionParameter {
+      parameters: {
+        $%s: ReflectionParameter {
 %A         position: 0
-%A      }
-      ]
-      modifiers: "public static"
-    }
 %A
 }
+EOTXT
+            , $var
+        );
+    }
+
+    public function testClosureCaster()
+    {
+        $a = $b = 123;
+        $var = function ($x) use ($a, &$b) {};
+
+        $this->assertDumpMatchesFormat(
+            <<<EOTXT
+Closure {
+%Aparameters: {
+    \$x: {}
+  }
+  use: {
+    \$a: 123
+    \$b: & 123
+  }
+  file: "%sReflectionCasterTest.php"
+  line: "62 to 62"
+}
 EOTXT
             , $var
         );
diff --git a/src/Symfony/Component/VarDumper/Tests/CliDumperTest.php b/src/Symfony/Component/VarDumper/Tests/CliDumperTest.php
index 316e3c61c5348..cfb2c6c464192 100644
--- a/src/Symfony/Component/VarDumper/Tests/CliDumperTest.php
+++ b/src/Symfony/Component/VarDumper/Tests/CliDumperTest.php
@@ -84,13 +84,13 @@ class: "Symfony\Component\VarDumper\Tests\CliDumperTest"
     +"bar": "bar"
   }
   "closure" => Closure {{$r}{$closure54}
-    parameters: array:2 [
-      "\$a" => []
-      "&\$b" => array:2 [
-        "typeHint" => "PDO"
-        "default" => null
-      ]
-    ]
+    parameters: {
+      \$a: {}
+      &\$b: {
+        typeHint: "PDO"
+        default: null
+      }
+    }
     file: "{$var['file']}"
     line: "{$var['line']} to {$var['line']}"
   }
diff --git a/src/Symfony/Component/VarDumper/Tests/HtmlDumperTest.php b/src/Symfony/Component/VarDumper/Tests/HtmlDumperTest.php
index a6e909fb45010..9cdd096ffe51f 100644
--- a/src/Symfony/Component/VarDumper/Tests/HtmlDumperTest.php
+++ b/src/Symfony/Component/VarDumper/Tests/HtmlDumperTest.php
@@ -87,13 +87,13 @@ public function testGet()
     +"<span class=sf-dump-public title="Runtime added dynamic property">bar</span>": "<span class=sf-dump-str title="3 characters">bar</span>"
   </samp>}
   "<span class=sf-dump-key>closure</span>" => <span class=sf-dump-note>Closure</span> {{$r}<samp>{$closure54}
-    <span class=sf-dump-meta>parameters</span>: <span class=sf-dump-note>array:2</span> [<samp>
-      "<span class=sf-dump-key>\$a</span>" => []
-      "<span class=sf-dump-key>&amp;\$b</span>" => <span class=sf-dump-note>array:2</span> [<samp>
-        "<span class=sf-dump-key>typeHint</span>" => "<span class=sf-dump-str title="3 characters">PDO</span>"
-        "<span class=sf-dump-key>default</span>" => <span class=sf-dump-const>null</span>
-      </samp>]
-    </samp>]
+    <span class=sf-dump-meta>parameters</span>: {<samp>
+      <span class=sf-dump-meta>\$a</span>: {}
+      <span class=sf-dump-meta>&amp;\$b</span>: {<samp>
+        <span class=sf-dump-meta>typeHint</span>: "<span class=sf-dump-str title="3 characters">PDO</span>"
+        <span class=sf-dump-meta>default</span>: <span class=sf-dump-const>null</span>
+      </samp>}
+    </samp>}
     <span class=sf-dump-meta>file</span>: "<span class=sf-dump-str title="%d characters">{$var['file']}</span>"
     <span class=sf-dump-meta>line</span>: "<span class=sf-dump-str title="%d characters">{$var['line']} to {$var['line']}</span>"
   </samp>}