1 files changed, 9 insertions, 0 deletions
diff --git a/ops/optimizer_tests/op_state_warning.rs b/ops/optimizer_tests/op_state_warning.rs
new file mode 100644
index 000000000..a725e6f7e
--- /dev/null
+++ b/ops/optimizer_tests/op_state_warning.rs
@@ -0,0 +1,9 @@
+fn op_listen(state: &mut OpState) -> Result<ResourceId, Error> {
+  log::debug!("listen");
+  let addr = "127.0.0.1:4570".parse::<SocketAddr>().unwrap();
+  let std_listener = std::net::TcpListener::bind(&addr)?;
+  std_listener.set_nonblocking(true)?;
+  let listener = TcpListener::try_from(std_listener)?;
+  let rid = state.resource_table.add(listener);
+  Ok(rid)
+}