chore: checkpoint before Python removal

vendor/async-trait/tests/ui/no-attribute-macro.rs

@@ -0,0 +1,13 @@
+pub trait Trait {
+    async fn method(&self);
+}
+
+pub struct Struct;
+
+impl Trait for Struct {
+    async fn method(&self) {}
+}
+
+fn main() {
+    let _: &dyn Trait;
+}