diff -r 3884815c0629 -r 1679cdfe4172 vm/src/main/java/org/apidesign/vm4brwsr/VM.java
--- a/vm/src/main/java/org/apidesign/vm4brwsr/VM.java	Sat Dec 15 08:17:45 2012 +0100
+++ b/vm/src/main/java/org/apidesign/vm4brwsr/VM.java	Sat Dec 29 20:20:59 2012 +0100
@@ -33,6 +33,11 @@
         // uses VMLazy to load dynamic classes
         VMLazy.init();
     }
+
+    @Override
+    boolean debug(String msg) throws IOException {
+        return false;
+    }
     
     static void compile(Bck2Brwsr.Resources l, Appendable out, StringArray names) throws IOException {
         new VM(out).doCompile(l, names);