chore: checkpoint before Python removal

vendor/async-trait/tests/ui/self-span.rs

@@ -0,0 +1,30 @@
+use async_trait::async_trait;
+
+pub struct S {}
+
+pub enum E {
+    V {},
+}
+
+#[async_trait]
+pub trait Trait {
+    async fn method(self);
+}
+
+#[async_trait]
+impl Trait for S {
+    async fn method(self) {
+        let _: () = self;
+        let _: Self = Self;
+    }
+}
+
+#[async_trait]
+impl Trait for E {
+    async fn method(self) {
+        let _: () = self;
+        let _: Self = Self::V;
+    }
+}
+
+fn main() {}