[Defletter]

The last I heard, Rust had issues with freeing memory when it wouldn't need to, particularly with short-lived processes (like terminal programs) where the the Rust program would be freeing everything while the C version would just exit out and let the operating system do cleanup.

[asa400]

Rust has ManuallyDrop, which is exactly the functionality you’re describing. It works just fine for those types of programs. The speed of the two is going to be largely dependent on the amount of effort that has gone into optimizing either one, not on some theoretical performance bound. They’re both basically the same there. There are tons of examples of this in the wild at this point.

[zozbot234]

ManuallyDrop seems overkill when you have Box::leak().

[edflsafoiewq]

You may also be able to simply exit() before your allocations get dropped.