Since Rust supports generics and algebraic data types, you can clearly denote on your return type what kind of errors can be expected and include useful data pe

Since Rust supports generics and algebraic data types, you can clearly denote on your return type what kind of errors can be expected and include useful data pertaining to each one, with the compiler making sure everything in its place; as opposed to casting from the error interface in a brittle manner prone to breaking on changes with no help from the compiler. Since Result is also a functor in practice, you can chain modifications to the happy path without having to check errors when you don't need to and without having to write as much boilerplate.