Index: tests/concurrency/signal/block.cfa
===================================================================
--- tests/concurrency/signal/block.cfa	(revision 10b5970650e2ff3d8e757dd5c91889d466e44fe0)
+++ tests/concurrency/signal/block.cfa	(revision b6de35ec789adbc02c9c90ec2de52be7f841fd58)
@@ -80,5 +80,5 @@
 	[a.last_thread, b.last_thread, a.last_signaller, b.last_signaller] = active_thread();
 
-	if( !is_empty( cond ) ) {
+	if( ! empty( cond ) ) {
 
 		thread$ * next = ( thread$ * ) front( cond );