chore: checkpoint before Python removal

vendor/tracing-subscriber/tests/registry_with_subscriber.rs

@@ -0,0 +1,25 @@
+#![cfg(feature = "registry")]
+use tracing_futures::{Instrument, WithSubscriber};
+use tracing_subscriber::prelude::*;
+
+#[tokio::test]
+async fn future_with_subscriber() {
+    tracing_subscriber::registry().init();
+    let span = tracing::info_span!("foo");
+    let _e = span.enter();
+    let span = tracing::info_span!("bar");
+    let _e = span.enter();
+    tokio::spawn(
+        async {
+            async {
+                let span = tracing::Span::current();
+                println!("{:?}", span);
+            }
+            .instrument(tracing::info_span!("hi"))
+            .await
+        }
+        .with_subscriber(tracing_subscriber::registry()),
+    )
+    .await
+    .unwrap();
+}