For a piece of code like this, it's too bad there is not a relatively easy conversion possible to an arena-based allocator. Because then the leak would not be r

For a piece of code like this, it's too bad there is not a relatively easy conversion possible to an arena-based allocator. Because then the leak would not be relevant. I wonder if it would be possible in Rust to do some magic at the Rust/C border in order to trick old C code into living inside an arena that is invisible to it?