That's exactly what you get with Result and Option, it's impossible to forget.

Compare:

    char* hash = crypt(key, salt);

    // We crash here on the hash derefence, it's no clear from the code
    // that we were supposed to check for NULL or that we forgot. 
    if (!strcmp(hash, expected)) {
    }

    let result: Result<Vec<u8>, Error> = crypt(key, salt);
    // We MUST write this line, which is a very clear signal
    // that we can panic here.
    // This can be grepped for or forbidden.
    let hash: String = result.unwrap();

    // if result == expected { would type error
    if hash == expected {
    }