Dynamic dispatch is in the language too. use core::fmt::Display; fn show_monomorphic<T: Display>(first: T, second: T) { println!("{} then

Dynamic dispatch is in the language too. use core::fmt::Display; fn show_monomorphic<T: Display>(first: T, second: T) { println!("{} then {}", first, second); } fn show_polymorphic(first: &dyn Display, second: &dyn Display) { println!("{} then {}", first, second); } pub fn main() { show_monomorphic(17, 23); show_monomorphic("fnord", "slack"); show_polymorphic(&42, &"quirkafleeg"); // mixed types! } There are things you can do with each that you can't do with the other, but they are often both viable choices.