// Taking T by value
impl Box<T> {
    fn map<U>(this: Self, f: impl FnOnce(T) -> U) -> Box<U>;
    fn try_map<R>(this: Self, f: impl FnOnce(T) -> R) -> ChangeOutputType<R, Box<R::Output>>
    where
        R: Try,
        R::Residual: Residual<Box<R::Output, A>>;
}
impl UniqueRc<T> {
    fn map<U>(this: Self, f: impl FnOnce(T) -> U) -> UniqueRc<U>;
    fn try_map<R>(this: Self, f: impl FnOnce(T) -> R) -> ChangeOutputType<R, UniqueRc<R::Output>>
    where
        R: Try,
        R::Residual: Residual<UniqueRc<R::Output, A>>;
}
impl UniqueArc<T> {
    fn map<U>(this: Self, f: impl FnOnce(T) -> U) -> UniqueArc<U>;
    fn try_map<R>(this: Self, f: impl FnOnce(T) -> R) -> ChangeOutputType<R, UniqueArc<R::Output>>
    where
        R: Try,
        R::Residual: Residual<UniqueArc<R::Output, A>>;
}

// Taking T by reference
impl Rc<T> {
    fn map<U>(this: Self, f: impl FnOnce(&T) -> U) -> Rc<U>;
    fn try_map<R>(this: Self, f: impl FnOnce(&T) -> R) -> ChangeOutputType<R, Rc<R::Output>>
    where
        R: Try,
        R::Residual: Residual<Rc<R::Output, A>>;
}
impl Arc<T> {
    fn map<U>(this: Self, f: impl FnOnce(&T) -> U) -> Arc<<U>;
    fn try_map<R>(this: Self, f: impl FnOnce(&T) -> R) -> ChangeOutputType<R, Arc<<R::Output>>
    where
        R: Try,
        R::Residual: Residual<Arc<R::Output, A>>;
}