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

//@aux-build:proc_macros.rs

#![warn(clippy::must_use_unit)]
#![expect(clippy::unused_unit)]

extern crate proc_macros;
use proc_macros::external;

#[must_use]
pub fn must_use_default() {}
//~^ must_use_unit

#[must_use]
pub fn must_use_unit() -> () {}
//~^ must_use_unit

#[must_use = "With note"]
pub fn must_use_with_note() {}
//~^ must_use_unit

// We should not lint in external macros
external!(
    #[must_use]
    fn foo() {}
);

fn main() {}