chore: checkpoint before Python removal

vendor/async-trait/tests/ui/lifetime-defined-here.rs

@@ -0,0 +1,23 @@
+use async_trait::async_trait;
+
+#[async_trait]
+trait Foo {
+    async fn bar(&self, x: &str, y: &'_ str) -> &'static str;
+}
+
+struct S(String);
+
+#[async_trait]
+impl Foo for S {
+    async fn bar(&self, x: &str, y: &'_ str) -> &'static str {
+        if false {
+            &self.0
+        } else if false {
+            x
+        } else {
+            y
+        }
+    }
+}
+
+fn main() {}