Error Handling in Rust that Every Beginner should Know Snippet 1

option_unwrap.rs

pub const fn unwrap(self) -> T {
    match self {
        Some(val) => val,
        None => panic!("called `Option::unwrap()` on a `None` value"),
    }
}
pub fn expect(self, msg: &str) -> T {
    match self {
        Some(val) => val,
        None => expect_failed(msg),
    }
}
fn expect_failed(msg: &str) -> ! {
    panic!("{}", msg)
}