This already exists in C++, and it's a tremendously bad idea and the example you gave exemplifies why it's a pointless thing to do and I hope that the Committee never introduces it.
For example, if you have a file handle, then write a class to do it for you and then you won't have to write a defer statement for every single use case, which you could easily forget to do. Or just plain get it wrong. You write one destructor, once. That's it. Then you're guaranteed for all uses of the class that it's safe. It's much safer and much easier.
