diff --git a/vars/pgrep_proc.groovy b/vars/pgrep_proc.groovy
index 556a599..9629de4 100644
--- a/vars/pgrep_proc.groovy
+++ b/vars/pgrep_proc.groovy
@@ -73,6 +73,10 @@
 
     println("** ${iam}: ENTER")
 
+    // var = Gstring throws exception due to cast problem.
+    // var = [ 'foo', 'bar' 'tans' ].join(' ').toString() fails
+    throw new Exception("Not yet implemented")
+    
     try {
         process(proc, args)
     }