commit 4870cc6d50c869b0a2d5f882ad7a3cdba1676100
Author: Joel Pittet <joel@pittet.ca>
Date:   Thu Apr 3 19:58:10 2014 -0700

    no more printed state

diff --git a/core/lib/Drupal/Core/Template/Attribute.php b/core/lib/Drupal/Core/Template/Attribute.php
index 7833acc..ead5d05 100644
--- a/core/lib/Drupal/Core/Template/Attribute.php
+++ b/core/lib/Drupal/Core/Template/Attribute.php
@@ -112,11 +112,9 @@ public function offsetExists($name) {
   public function __toString() {
     $return = '';
     foreach ($this->storage as $name => $value) {
-      if (!$value->printed()) {
-        $rendered = $value->render();
-        if ($rendered) {
-          $return .= ' ' . $rendered;
-        }
+      $rendered = $value->render();
+      if ($rendered) {
+        $return .= ' ' . $rendered;
       }
     }
     return $return;
diff --git a/core/lib/Drupal/Core/Template/AttributeArray.php b/core/lib/Drupal/Core/Template/AttributeArray.php
index 38f216f..95e0ef3 100644
--- a/core/lib/Drupal/Core/Template/AttributeArray.php
+++ b/core/lib/Drupal/Core/Template/AttributeArray.php
@@ -66,7 +66,6 @@ public function offsetExists($offset) {
    * Implements the magic __toString() method.
    */
   public function __toString() {
-    $this->printed = TRUE;
     return String::checkPlain(implode(' ', $this->value));
   }
 
diff --git a/core/lib/Drupal/Core/Template/AttributeBoolean.php b/core/lib/Drupal/Core/Template/AttributeBoolean.php
index db444fd..4e9ea67 100644
--- a/core/lib/Drupal/Core/Template/AttributeBoolean.php
+++ b/core/lib/Drupal/Core/Template/AttributeBoolean.php
@@ -42,7 +42,6 @@ public function render() {
    * Implements the magic __toString() method.
    */
   public function __toString() {
-    $this->printed = TRUE;
     return $this->value === FALSE ? '' : String::checkPlain($this->name);
   }
 
diff --git a/core/lib/Drupal/Core/Template/AttributeString.php b/core/lib/Drupal/Core/Template/AttributeString.php
index a2a5514..07211be 100644
--- a/core/lib/Drupal/Core/Template/AttributeString.php
+++ b/core/lib/Drupal/Core/Template/AttributeString.php
@@ -30,7 +30,6 @@ class AttributeString extends AttributeValueBase {
    * Implements the magic __toString() method.
    */
   public function __toString() {
-    $this->printed = TRUE;
     return String::checkPlain($this->value);
   }
 
diff --git a/core/lib/Drupal/Core/Template/AttributeValueBase.php b/core/lib/Drupal/Core/Template/AttributeValueBase.php
index 6ccd339..73e6bee 100644
--- a/core/lib/Drupal/Core/Template/AttributeValueBase.php
+++ b/core/lib/Drupal/Core/Template/AttributeValueBase.php
@@ -17,13 +17,6 @@
 abstract class AttributeValueBase {
 
   /**
-   * Whether this attribute hsa been printed already.
-   *
-   * @var bool
-   */
-  protected $printed = FALSE;
-
-  /**
    * The value itself.
    *
    * @var mixed
@@ -61,16 +54,6 @@ public function render() {
   }
 
   /**
-   * Whether this attribute hsa been printed already.
-   *
-   * @return bool
-   *   TRUE if this attribute has been printed, FALSE otherwise.
-   */
-  public function printed() {
-    return $this->printed;
-  }
-
-  /**
    * Implements the magic __toString() method.
    */
   abstract function __toString();
diff --git a/core/modules/system/lib/Drupal/system/Tests/Theme/TwigFilterTest.php b/core/modules/system/lib/Drupal/system/Tests/Theme/TwigFilterTest.php
index 42be0c1..9b514d7 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Theme/TwigFilterTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Theme/TwigFilterTest.php
@@ -50,7 +50,6 @@ public function testTwigWithoutFilter() {
         'class' => array('red', 'green', 'blue'),
       ),
     );
-
     $rendered = drupal_render($filter_test);
     $this->drupalSetContent($rendered);
 
diff --git a/core/modules/system/tests/modules/twig_theme_test/templates/twig_theme_test.filter.html.twig b/core/modules/system/tests/modules/twig_theme_test/templates/twig_theme_test.filter.html.twig
index 308e9f4..28e5c15 100644
--- a/core/modules/system/tests/modules/twig_theme_test/templates/twig_theme_test.filter.html.twig
+++ b/core/modules/system/tests/modules/twig_theme_test/templates/twig_theme_test.filter.html.twig
@@ -16,7 +16,7 @@
 <div><span class="{{ attributes.class }}"{{ attributes|without('class') }}>Class attributes in front, remainder at the back:</span></div>
 <div><span{{ attributes|without('class') }} data-class="{{ attributes.class }}">Class attributes in back, remainder at the front:</span></div>
 <div><span class="{{ attributes.class }}">Class attributes only:</span></div>
-<div><span{{ attributes.checked }}{{ attributes|without('checked') }}>Without boolean attribute.</span></div>
+<div><span {{ attributes.checked }}{{ attributes|without('checked') }}>Without boolean attribute.</span></div>
 <div><span data-id="{{ attributes.id }}"{{ attributes|without('id') }}>Without string attribute.</span></div>
 <div><span{{ attributes|without('id', 'class') }}>Without either nor class attributes.</span></div>
 <div><span{{ attributes }}>All attributes again.</span></div>
diff --git a/core/themes/engines/twig/twig.engine b/core/themes/engines/twig/twig.engine
index d596715..1595bf8 100644
--- a/core/themes/engines/twig/twig.engine
+++ b/core/themes/engines/twig/twig.engine
@@ -164,7 +164,12 @@ function twig_render_var($arg) {
  *   The filtered renderable array.
  */
 function twig_without($element) {
-  $filtered_element = $element;
+  if ($element instanceof ArrayAccess) {
+    $filtered_element = clone $element;
+  }
+  else {
+    $filtered_element = $element;
+  }
   $args = func_get_args();
   unset($args[0]);
   foreach ($args as $arg) {