BeefLang will report leaks as they occur, not when the program shuts down. There's a tracing "GC" in debug mode for detecting unreachable memory in realtime. It's also used for reliably detecting use-after-free since memory is held when there are references and released when the last reference goes away -- again, a debug-only feature.
This is totally possible with custom allocators in Odin too. You'll be surprised by how much custom allocators can do, but so many people know little about them.
