dyn-slice 3.2.2

&dyn [Trait] implementation, inspired by a Reddit thread.
Documentation 
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// Make sure that a mutable dyn slice cannot hand out a mutable
// reference from an iterator while there is also an immutable borrow

use dyn_slice::standard::borrow;

fn main() {
    let mut array_1 = [1, 2, 3, 4, 5];
    let mut slice_1 = borrow::new_mut(&mut array_1);

    let a = slice_1.iter_mut().next().unwrap();

    let element = slice_1.get(1).unwrap();

    a.borrow();

    let _ = element.borrow();
}