1The enum `Either` with variants `Left` and `Right` is a general purpose 2sum type with two cases. 3 4Either has methods that are similar to Option and Result, and it also implements 5traits like `Iterator`. 6 7Includes macros `try_left!()` and `try_right!()` to use for 8short-circuiting logic, similar to how the `?` operator is used with `Result`. 9Note that `Either` is general purpose. For describing success or error, use the 10regular `Result`. 11