1 files changed, 27 insertions, 0 deletions
diff --git a/tests/ui/lint/issue-47775-nested-macro-unnecessary-parens-arg.rs b/tests/ui/lint/issue-47775-nested-macro-unnecessary-parens-arg.rs
new file mode 100644
index 00000000000..0a951cfa91c
--- /dev/null
+++ b/tests/ui/lint/issue-47775-nested-macro-unnecessary-parens-arg.rs
@@ -0,0 +1,27 @@
+// 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<isize> { Some((2)) }
+    }
+}
+
+the_worship_the_heart_lifts_above!(rah);
+and_the_heavens_reject_not!();
+
+fn main() {}