f drop mut, old rustc may fail

Author: TheBlueMatt

lightning/src/ln/monitor_tests.rs

@@ -43,7 +43,7 @@ fn chanmon_fail_from_stale_commitment() {
 	let chanmon_cfgs = create_chanmon_cfgs(3);
 	let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
 	let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, None, None]);
-	let mut nodes = create_network(3, &node_cfgs, &node_chanmgrs);
+	let nodes = create_network(3, &node_cfgs, &node_chanmgrs);
 
 	create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
 	let (update_a, _, chan_id_2, _) = create_announced_chan_between_nodes(&nodes, 1, 2, InitFeatures::known(), InitFeatures::known());