$this->io->write('<info>Installing dependencies'.($withDevReqs?' (including require-dev)':'').' from lock file</info>');
if (!$this->locker->isCompleteFormat($withDevReqs)) {
$this->io->write('<warning>Warning: Your lock file is in a deprecated format. It will most likely take a *long* time for composer to install dependencies, and may cause dependency solving issues.</warning>');
}
if (!$this->locker->isFresh()) {
$this->io->write('<warning>Warning: The lock file is not up to date with the latest changes in composer.json. You may be getting outdated dependencies. Run update to update them.</warning>');
throw new \RuntimeException('Your composer.lock was created before 2012-09-15, and is not supported anymore. Run "composer update" to generate a new one.');