[throwawaymaths]

No. You definitely want it to not cause an error/panic (zig does not have exceptions).

1. Frees are never supposed to error

2. You want code to be interchangeable so that you can try out different allocators.

3. Eventually when someone writes a lifetime analysis tool for zig, you'll want to signify the memory as freed

4. If your program is long-running (the bumping is part of a subtask) you probably want the bump allocator to be itself freed on its own lifetime, so you'll eventually free that memory.