> The reason for this is that in Rust, a struct couples type-checking to a fixed data representation. You can't get one without the other.

> Clojure decouples data representations from type checking.

This is funny to me because seen from the other side, (this) Clojure couples runtime type information to data structures: you're no longer allowed to define a data structure that doesn't have some runtime type information attached. A fixed static structure is just the consequence of not adding dynamic type information.

Meanwhile in Rust you can get type-checking ‘without’ a fixed structure by using trait objects.

Yeah that example was pretty flimsy and contrived.