From e3dd4c198762d44e9e95e000397e1534dfca54cf Mon Sep 17 00:00:00 2001
From: Jonathan Brouwer <jonathantbrouwer@gmail.com>
Date: Fri, 17 Oct 2025 16:45:49 +0200
Subject: [PATCH] Warn on `unused_attributes` in tests

Signed-off-by: Jonathan Brouwer <jonathantbrouwer@gmail.com>
---
 src/tools/compiletest/src/runtest.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/tools/compiletest/src/runtest.rs b/src/tools/compiletest/src/runtest.rs
index e9dea95cafbd..ff275df9b31c 100644
--- a/src/tools/compiletest/src/runtest.rs
+++ b/src/tools/compiletest/src/runtest.rs
@@ -1838,8 +1838,9 @@ impl<'test> TestCx<'test> {
 
         // Add `-A unused` before `config` flags and in-test (`props`) flags, so that they can
         // overwrite this.
+        // Don't allow `unused_attributes` since these are usually actual mistakes, rather than just unused code.
         if let AllowUnused::Yes = allow_unused {
-            rustc.args(&["-A", "unused"]);
+            rustc.args(&["-A", "unused", "-W", "unused_attributes"]);
         }
 
         // Allow tests to use internal features.