Warn on unused_attributes in tests

Signed-off-by: Jonathan Brouwer <jonathantbrouwer@gmail.com>

Author: JonathanBrouwer

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.