On the one hand, I've done this enough times that I can usually write it on auto-pilot without thinking about it. But on the other hand, whenever I make a mist

On the one hand, I've done this enough times that I can usually write it on auto-pilot without thinking about it. But on the other hand, whenever I make a mistake, the resulting bug is really hard to track down, because it's tough to just stare at the line and recognize that something wrong.