[IshKebab]

You can't. `entry()` takes they key by value, not by reference:

https://doc.rust-lang.org/std/collections/hash_map/struct.Ha...

You might be getting confused because in that example the `HashMap` keys are references.

[GrumpySloth]

My bad. That’s not been an issue in my code, as I use arenas to manage memory and never put an owning container as key in a HashMap.