The bug was from <a href="https://github.com/rajivnavada/bootstrap/commit/49d565a6da38359a776f83f31a1f1ccd658c88a7#L0R35" rel="nofollow">https://github.com/rajivnavada/bootstrap/commit/49d565a6da38...</a>, which used /bin/cat inappropriately. Parsing x+y is not equivalent to parsing x fully and then y, so javascript-aware tools are required for that sort of packaging.
This problem is very prevalent when concatenating JavaScript. The best defense is to prepend a semicolon before anonymous function closures.<p>For example, see Paul Irish's geo-location shim <a href="https://gist.github.com/366184" rel="nofollow">https://gist.github.com/366184</a>