1.1 --- a/rt/vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java	Thu May 29 09:57:01 2014 +0200
     1.2 +++ b/rt/vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java	Sun Jun 22 00:09:56 2014 +0200
     1.3 @@ -260,15 +260,18 @@
     1.4          append("\n    c.constructor = CLS;");
     1.5          append("\n    function fillInstOf(x) {");
     1.6          String instOfName = "$instOf_" + className;
     1.7 -        append("\n        x['").append(instOfName).append("'] = true;");
     1.8 +        append("\n        Object.defineProperty(x, '").append(instOfName).append("', { value : true });");
     1.9          for (String superInterface : jc.getSuperInterfaces()) {
    1.10              String intrfc = superInterface.replace('/', '_');
    1.11              append("\n      vm.").append(intrfc).append("(false)['fillInstOf'](x);");
    1.12              requireReference(superInterface);
    1.13          }
    1.14          append("\n    }");
    1.15 -        append("\n    c['fillInstOf'] = fillInstOf;");
    1.16 -        append("\n    fillInstOf(c);");
    1.17 +        append("\n    try {");
    1.18 +        append("\n      Object.defineProperty(c, 'fillInstOf', { value: fillInstOf });");
    1.19 +        append("\n      fillInstOf(c);");
    1.20 +        append("\n    } catch (ignore) {");
    1.21 +        append("\n    }");
    1.22  //        obfuscationDelegate.exportJSProperty(this, "c", instOfName);
    1.23          append("\n    CLS.$class = 'temp';");
    1.24          append("\n    CLS.$class = ");