By default, Rust does stack unwinding on panic, but you can choose to abort instead, letting the OS reclaim the memory instead. Setting this option results in smaller binaries.
You can execute a panic by calling the panic! macro.
The Result type is defined as
enum Result<T, E> {
Ok(T),
Err(E),
}The ? operator can be used to return the error value without having to write a match
statement, effectively propagating the error. This will also automatically convert
the type to the one specified as the function return type, via the from function.
The Box<dyn Error> type is a trait object, which basically covers any kind of
error. Hence, if you want to use the ? operator inside the main function, you can
make main return Result<(), Box<dyn Error>>.
You can put your validation code in the new implementation of a struct.