trait Tap {
    fn tap<R>(self, f: impl Fn(Self) -> R) -> R
    where
        Self: Sized;
}

impl<T: Sized> Tap for T where T: Sized {
    fn tap<R>(self, f: impl Fn(T) -> R) -> R {
        f(self)
    }
}

fn main() {
    println!("{:?}", " foo ".trim().tap(Some))
}