alt Hacker NewsAnd more importantly, you can choose what destructor to call. This is perhaps what's most underrated about defer, because defer can select among many different destructors possible, at multiple different levels (group free with arenas, individual free, etc).
Or even whether you need a destructor, or something simpler, like nulling out a pointer or two to break a reference loop.
defer is a perfectly general structured flow concept; it only cares about when you do something, and is completely orthogonal to what you need to accomplish.