//@ check-pass #![warn(unused_parens)] macro_rules! the_worship_the_heart_lifts_above { ( @as_expr, $e:expr) => { $e }; ( @generate_fn, $name:tt) => { #[allow(dead_code)] fn the_moth_for_the_star<'a>() -> Option<&'a str> { Some(the_worship_the_heart_lifts_above!( @as_expr, $name )) } }; ( $name:ident ) => { the_worship_the_heart_lifts_above!( @generate_fn, (stringify!($name))); } // ↑ Notably, this does 𝘯𝘰𝘵 warn: we're declining to lint unused parens in // function/method arguments inside of nested macros because of situations // like those reported in Issue #47775 } macro_rules! and_the_heavens_reject_not { () => { #[allow(dead_code)] fn the_night_for_the_morrow() -> Option { Some((2)) } } } the_worship_the_heart_lifts_above!(rah); and_the_heavens_reject_not!(); fn main() {}