This should not be downvoted, this sort of error is indeed a very easy one to make when dealing with the C pre-processor.

> Some of these are wrong to[o] <- that needs an extra 'o' > due to not having brackets. <- that one is fine > So it's just extremely lazy to[o]. <- that needs an extra 'o' too

'to' comes in two versons, 'too' and 'to', both have different meanings.