Auto merge of #143526 - matthiaskrgr:rollup-pm69g5v, r=matthiaskrgr

Rollup of 4 pull requests

Successful merges:

 - rust-lang/rust#143252 (Rewrite empty attribute lint for new attribute parser)
 - rust-lang/rust#143492 (Use `object` crate from crates.io to fix windows build error)
 - rust-lang/rust#143514 (Organize macro tests a bit more)
 - rust-lang/rust#143518 (rustc_builtin_macros: Make sure registered attributes stay sorted)

r? `@ghost`
`@rustbot` modify labels: rollup

1 files changed, 21 insertions, 0 deletions

diff --git a/tests/ui/async-await/async-fn/macro-async-trait-bound-theoretical-regression.rs b/tests/ui/async-await/async-fn/macro-async-trait-bound-theoretical-regression.rs
new file mode 100644
index 00000000000..ea67831b68e
--- /dev/null
+++ b/tests/ui/async-await/async-fn/macro-async-trait-bound-theoretical-regression.rs
@@ -0,0 +1,21 @@
+// Demonstrates and records a theoretical regressions / breaking changes caused by the
+// introduction of async trait bounds.
+
+// Setting the edition to 2018 since we don't regress `demo! { dyn async }` in Rust <2018.
+//@ edition:2018
+
+macro_rules! demo {
+    ($ty:ty) => { compile_error!("ty"); };
+    //~^ ERROR ty
+    //~| ERROR ty
+    (impl $c:ident Trait) => {};
+    (dyn $c:ident Trait) => {};
+}
+
+demo! { impl async Trait }
+//~^ ERROR `async` trait bounds are unstable
+
+demo! { dyn async Trait }
+//~^ ERROR `async` trait bounds are unstable
+
+fn main() {}