Description:
------------
When creating a PDO connection with the Mysql driver, and setting a persistent default fetch mode, PHP will generate an E_WARNING message.

The PDO, Mysql driver is version 5.0.19 as reported by phpinfo.

The source has the comment: "TODO: CRITICAL for final release" 

1816  20 :  if (stmt->dbh->is_persistent) {
1817     :      /* TODO: CRITICAL for final release */
1818   0 :      php_error_docref(NULL TSRMLS_CC, E_WARNING, "PHP might crash if you don't call $stmt->setFetchMode() to reset to defaults on this persistent statement.  This will be fixed in a later release");
1819     :  }

Reproduce code:
---------------
$dbh = new PDO('mysql:host=localhost;dbname=test', $user, $pass, array(
  PDO::ATTR_PERSISTENT => true
));

Expected result:
----------------
 PDOStatement::setFetchMode() to run without an E_WARNING.

Actual result:
--------------
Warning: PDOStatement::setFetchMode() [function.setFetchMode]: PHP might crash if you don't call $stmt->setFetchMode() to reset to defaults on this persistent statement. This will be fixed in a later release in ...