Provided you had heated the bejaysus out of it, and it hadn't begun to obviously spoil, it probably would have been okay. Once food is heated beyond 63 degrees celsius, it kills all germs that are harmful to humans. So if it looks and smells okay, then just roast the life out of it and it probably won't make you ill. Food poisoning usually only occurs when reheated food is not heated to a high enough temperature.
I wouldn't risk digging it out of the bin though!