Comment by aapoalas

In this case they seem to have Rust on both sides of the FFI API and seemingly want to avoid heap allocating the Vec's static parts, which makes sense.

So, an extended version if your solution would be to initialize the static parts on the stack using `MaybeUninit`, and `assume_init` on that after the call to get an `OwningArrayC<T>` out, which then can have a Drop impl defined for it.