[EugeneOZ]

There is no confusion. Rust doesn't have dynamic type and Dart does. That's it.

Any talks about special traits in Rust are offtopic, while code I wrote as example can't be compiled in Rust and can perfectly work in Dart.

I wasn't trying to argue about words or terms, I was trying to say the gist: Dart has dynamic type, so you can send to your function any type and this function will just use it, without any downcasting - language will take care about it; and Rust doesn't have such type: you can't even compile code which is trying to work with variables like you can do in dynamic languages.

But then all of that useless arguing... It's really funny when I see how people are trying to prove that Rust has same dynamic type as Dart. The very nature of these languages is different.