Function itertools::cloned

pub fn cloned<'a, I, T: 'a>(iterable: I) -> Cloned<I::IntoIter> where
    I: IntoIterator<Item = &'a T>,
    T: Clone, 

Create an iterator that clones each element from &T to T

IntoIterator enabled version of i.cloned().

use itertools::cloned;

assert_eq!(cloned(b"abc").next(), Some(b'a'));