rust-clippy/tests/ui/let_underscore_drop.rs

#![warn(clippy::let_underscore_drop)]
#![allow(clippy::let_unit_value)]

struct Droppable;

impl Drop for Droppable {
    fn drop(&mut self) {}
}

fn main() {
    let unit = ();
    let boxed = Box::new(());
    let droppable = Droppable;
    let optional = Some(Droppable);

    let _ = ();
    let _ = Box::new(());
    let _ = Droppable;
    let _ = Some(Droppable);

    // no lint for reference
    let _ = droppable_ref();
}

#[must_use]
fn droppable_ref() -> &'static mut Droppable {
    unimplemented!()
}