rust/tests/ui/derives/clone-debug-dead-code-in-the-same-struct.rs

#![forbid(dead_code)]

#[derive(Debug)]
pub struct Whatever { //~ ERROR struct `Whatever` is never constructed
    pub field0: (),
    field1: (),
    field2: (),
    field3: (),
    field4: (),
}

fn main() {}