Rust has super traits but does not support subtyping. The way super traits work is that they merge all the vtables into one big vtable. However, you can still h

Rust has super traits but does not support subtyping. The way super traits work is that they merge all the vtables into one big vtable. However, you can still have a direct dyn trait reference to the sub traits. This means you need a separate vtable for all super traits and individual traits.