> 4. Error conditions must be handled immediately, but not necessarily
>     immediately in the correct manner, because when you're in the zone,
>     the last thing you want to do is stop and write error code,
>     forgetting your train of thought while you do so. In C assert() is
>     perfect for this. In some languages you can write a simple "try:" or
>     equivalent to just abort on exception, and worry about complete
>     handling later.