merged branch michaelperrin/feature/deprecation-messages (PR #6973)

This PR was merged into the 2.2 branch.

Commits
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badb2b9 Add "'property_path' => false" deprecation message for forms

Discussion
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Add "'property_path' => false" deprecation message for forms

src/Symfony/Component/Form/Extension/Core/Type/FormType.php

@@ -56,6 +56,10 @@ class FormType extends AbstractType
             ->setDataMapper($options['compound'] ? new PropertyPathMapper($this->propertyAccessor) : null)
         ;
 
+        if (false === $options['property_path']) {
+            trigger_error('\'property_path\' => false is deprecated since version 2.1 and will be removed in 2.3. Use \'mapped\' => false instead.', E_USER_DEPRECATED);
+        }
+
         if ($options['trim']) {
             $builder->addEventSubscriber(new TrimListener());
         }