symfony/symfony-standard — pull request #452 by gregholland (2012-11-29 21:25:04+00:00)
Title: Add note to the 2.1 upgrade doc

When upgrading from 2.0 -> 2.1, composer.phar will fail with a runtime exception when attempting to generate the autoload bootstrap file if the install is attempted before updating the existing files as per the guide (config.yml, app.php etc).