Note that Rust's Error is also a trait (similar to an interface) and Box<Error> does return heap allocated errors, and you're free to use that if you like. Bein

Note that Rust's Error is also a trait (similar to an interface) and Box<Error> does return heap allocated errors, and you're free to use that if you like. Being a trait object, it will erase the type of the error, but you don't have to write any of the accompanying From or Error implementations you normally would with your own ErrorType.