// MIR for `slice_iter_mut_next_back` after PreCodegen

fn slice_iter_mut_next_back(_1: &mut std::slice::IterMut<'_, T>) -> Option<&mut T> {
    debug it => _1;
    let mut _0: std::option::Option<&mut T>;

    bb0: {
        _0 = <std::slice::IterMut<'_, T> as DoubleEndedIterator>::next_back(move _1) -> [return: bb1, unwind unreachable];
    }

    bb1: {
        return;
    }
}