src/test/ui/lint/issue-47775-nested-macro-unnecessary-parens-arg.rs

   1 // check-pass
   2
   3 #![warn(unused_parens)]
   4
   5 macro_rules! the_worship_the_heart_lifts_above {
   6     ( @as_expr, $e:expr) => { $e };
   7     ( @generate_fn, $name:tt) => {
   8         #[allow(dead_code)] fn the_moth_for_the_star<'a>() -> Option<&'a str> {
   9             Some(the_worship_the_heart_lifts_above!( @as_expr, $name ))
  10         }
  11     };
  12     ( $name:ident ) => { the_worship_the_heart_lifts_above!( @generate_fn, (stringify!($name))); }
  13     // ↑ Notably, this does 𝘯𝘰𝘵 warn: we're declining to lint unused parens in
  14     // function/method arguments inside of nested macros because of situations
  15     // like those reported in Issue #47775
  16 }
  17
  18 macro_rules! and_the_heavens_reject_not {
  19     () => {
  20         #[allow(dead_code)] fn the_night_for_the_morrow() -> Option<isize> { Some((2)) }
  21     }
  22 }
  23
  24 the_worship_the_heart_lifts_above!(rah);
  25 and_the_heavens_reject_not!();
  26
  27 fn main() {}