The definition in Rust's documentation[0] was this: let x: Option<&str> = None; assert_eq!(x.unwrap(), "air"); // fails The equivalent Haskell if unwr

The definition in Rust's documentation[0] was this: let x: Option<&str> = None; assert_eq!(x.unwrap(), "air"); // fails The equivalent Haskell if unwrap throws a panic as the docs[0] seem to imply: λ> fromMaybe (error "panic!") Nothing *** Exception: panic! You could also do something like this if you don't mind dealing with the wrapped boolean value: λ> fmap (== "air") (Just "air") Just True and the failure case: λ> fmap (== "air") (Nothing) Nothing 0: https://doc.rust-lang.org/std/option/enum.Option.html#method.unwrap https://doc.rust-lang.org/std/option/enum.Option.html#method...