fix: compile with tokio_unstable

src/lib.rs

@@ -666,6 +666,8 @@ impl Node {
 		// FIXME: For now, we wait up to 100 secs (BDK_WALLET_SYNC_TIMEOUT_SECS + 10) to allow
 		// event handling to exit gracefully even if it was blocked on the BDK wallet syncing. We
 		// should drop this considerably post upgrading to BDK 1.0.
+		#[cfg(tokio_unstable)]
+		let runtime_clone = runtime.clone();
 		let timeout_res = tokio::task::block_in_place(move || {
 			runtime.block_on(async {
 				tokio::time::timeout(
@@ -702,7 +704,7 @@ impl Node {
 			log_trace!(
 				self.logger,
 				"Active runtime tasks left prior to shutdown: {}",
-				runtime.metrics().active_tasks_count()
+				runtime_clone.metrics().num_alive_tasks()
 			);
 		}