chore: checkpoint before Python removal

vendor/tracing/tests/future_send.rs

@@ -0,0 +1,22 @@
+// These tests reproduce the following issues:
+// - https://github.com/tokio-rs/tracing/issues/1487
+// - https://github.com/tokio-rs/tracing/issues/1793
+
+use core::future::{self, Future};
+#[test]
+fn async_fn_is_send() {
+    async fn some_async_fn() {
+        tracing::info!("{}", future::ready("test").await);
+    }
+
+    assert_send(some_async_fn())
+}
+
+#[test]
+fn async_block_is_send() {
+    assert_send(async {
+        tracing::info!("{}", future::ready("test").await);
+    })
+}
+
+fn assert_send<F: Future + Send>(_f: F) {}