PDO error

["Holografix" <holografix@xxxxxxxxx>]

Hi. When using this example from
http://netevil.org/talks/index.php?t=pdo&s=20, the site of pdo's author Wez 
Furlong, I
get this error:

Fatal error: Call to a member function fetchAll() on a non-object in
/www/home/testes/pdo_my1.php on line 8
<?php
....
....
$dbh = new PDO('mysql:host=localhost;dbname=dbtest', 'user', 'pass');
$stmt = $dbh->query("SELECT * FROM foo");
$rows = $stmt->fetchAll();
$count = count($rows);
foreach ($rows as $row) {
    print_r($row);
}
$stmt = null;
?>

What's wrong with the example?
I'm using php 5.1.0-dev, yesterday snapshot.

Greetings

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