commit 5f5782e89ea9078ba0a75baef3990f811b8aa5f3
Author: Yves Chedemois <yched.drupal@free.fr>
Date:   Wed Jun 5 14:54:06 2013 +0200

    fix validation errors on autocomplete widgets (e_r, taxo)

diff --git a/core/lib/Drupal/Core/Entity/Field/Type/EntityWrapper.php b/core/lib/Drupal/Core/Entity/Field/Type/EntityWrapper.php
index e99187b..c819ead 100644
--- a/core/lib/Drupal/Core/Entity/Field/Type/EntityWrapper.php
+++ b/core/lib/Drupal/Core/Entity/Field/Type/EntityWrapper.php
@@ -90,7 +90,7 @@ public function setValue($value, $notify = TRUE) {
     if ($value instanceof EntityInterface && $value->isNew()) {
       $this->newEntity = $value;
       $this->entityType = $value->entityType();
-      $value = FALSE;
+      $value = 0;
     }
     elseif ($value instanceof EntityInterface) {
       $this->entityType = $value->entityType();
diff --git a/core/modules/field/lib/Drupal/field/Plugin/field/field_type/LegacyCField.php b/core/modules/field/lib/Drupal/field/Plugin/field/field_type/LegacyCField.php
index f788609..dcd5d93 100644
--- a/core/modules/field/lib/Drupal/field/Plugin/field/field_type/LegacyCField.php
+++ b/core/modules/field/lib/Drupal/field/Plugin/field/field_type/LegacyCField.php
@@ -56,21 +56,9 @@ public function prepareCache() {
 
   /**
    * {@inheritdoc}
-   *
-   * @todo Other possible approach: implement getConstraints() and use a
-   * dedicated LegacyFieldConstraint class.
    */
   public function validate() {
-    // Do not validate base constraints for entity_reference items for now (the
-    // autocomplete widget receives 'target_id' as a string).
-    // @todo Remove the special case when http://drupal.org/node/2007422 is
-    // fixed.
-    if ($this->getPluginId() == 'field_type:entity_reference') {
-      $violations = new ConstraintViolationList();
-    }
-    else {
-      $violations = parent::validate();
-    }
+    $violations = parent::validate();
 
     // Filter out empty items (legacy hook_field_validate() implementations
     // used to receive pruned items).
diff --git a/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/field/widget/TaxonomyAutocompleteWidget.php b/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/field/widget/TaxonomyAutocompleteWidget.php
index 7ceb350..01a01fa 100644
--- a/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/field/widget/TaxonomyAutocompleteWidget.php
+++ b/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/field/widget/TaxonomyAutocompleteWidget.php
@@ -97,7 +97,7 @@ public function massageFormValues(array $values, array $form, array &$form_state
           'vid' => $vocabulary->id(),
           'name' => $value,
         ));
-        $item = array('tid' => FALSE, 'entity' => $term);
+        $item = array('tid' => 0, 'entity' => $term);
       }
       $items[] = $item;
     }