>> тупо вставка "abort"

...
>> Result<T, E> is the type used for returning and propagating errors. It is an enum with the variants, Ok(T), representing success and containing a value, and Err(E)
>> pub fn unwrap(self) -> T
>> Returns the contained Ok value, consuming the self value.
>> Panics if the value is an Err, with a panic message provided by the Err’s value.
>> Because this function may panic, its use is generally discouraged. Instead, prefer to use pattern matching and handle the Err case explicitly, or call unwrap_or, unwrap_or_else, or unwrap_or_default.
> Ты забыл - "неявная". Самое то для системного языка.

Зато ты не забыл нафантазировать что-то. Самое-то для очередного опеннетного коммента о расте.

#[stable(feature = "rust1", since = "1.0.0")]
    pub fn unwrap(self) -> T
    where
        E: fmt::Debug,
    {
        match self {
            Ok(t) => t,
            Err(e) => unwrap_failed("called `Result::unwrap()` on an `Err` value", &e),
        }
    }
fn unwrap_failed(msg: &str, error: &dyn fmt::Debug) -> ! {
    panic!("{}: {:?}", msg, error)
}

Неявность прям "изо всех щелей", ага.