src/tools/clippy/tests/ui/iter_next_slice.rs

#![warn(clippy::iter_next_slice)]
#![expect(clippy::useless_vec)]

fn main() {
    // test code goes here
    let s = [1, 2, 3];
    let v = vec![1, 2, 3];

    let _ = s.iter().next();
    //~^ iter_next_slice
    // Should be replaced by s.first()

    let _ = s[2..].iter().next();
    //~^ iter_next_slice
    // Should be replaced by s.get(2)

    let _ = v[5..].iter().next();
    //~^ iter_next_slice
    // Should be replaced by v.get(5)

    let _ = v.iter().next();
    //~^ iter_next_slice
    // Should be replaced by v.first()

    let o = Some(5);
    o.iter().next();
    // Shouldn't be linted since this is not a Slice or an Array

    let mut s_mut = [1, 2, 3];
    let mut v_mut = vec![1, 2, 3];

    let _: Option<&mut i32> = s_mut.iter_mut().next();
    //~^ iter_next_slice

    let _ = v_mut.iter_mut().next();
    //~^ iter_next_slice
}