Polymorphism

# // Copyright 2025 Google LLC
# // SPDX-License-Identifier: Apache-2.0
#
pub trait Trait {}

pub struct HasGeneric<T>(T);

pub enum Either<A, B> {
    Left(A),
    Right(B),
}

fn takes_generic<T: Trait>(value: &T) {}

fn takes_dyn(value: &dyn Trait) {}

• Rust has plenty of mechanisms for writing and using polymorphic code, but they're somewhat different from other popular languages!

• This chapter will cover the details of Rust's polymorphism and how it's similar, or different to, other languages.