1.1 --- a/rt/vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java	Mon Jun 09 19:32:49 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 = ");

     2.1 --- a/rt/vm/src/test/java/org/apidesign/vm4brwsr/Instance.java	Mon Jun 09 19:32:49 2014 +0200
     2.2 +++ b/rt/vm/src/test/java/org/apidesign/vm4brwsr/Instance.java	Sun Jun 22 00:09:56 2014 +0200
     2.3 @@ -135,6 +135,13 @@
     2.4          return jsgetbytes(new Instance());
     2.5      }
     2.6      
     2.7 +    public static int noInstOfExposed() {
     2.8 +        return countInstOf(10);
     2.9 +    }
    2.10 +    
    2.11 +    @JavaScriptBody(args = "o", body = "var i = 0; for (p in o) { if (p.toString().indexOf('instOf') >= 0) i++; } return i;")
    2.12 +    private static native int countInstOf(Object o);
    2.13 +    
    2.14      @JavaScriptBody(args = { "instance" }, body = "return instance.getByte__B();")
    2.15      private static native int jsgetbytes(Instance instance);
    2.16  

     3.1 --- a/rt/vm/src/test/java/org/apidesign/vm4brwsr/InstanceTest.java	Mon Jun 09 19:32:49 2014 +0200
     3.2 +++ b/rt/vm/src/test/java/org/apidesign/vm4brwsr/InstanceTest.java	Sun Jun 22 00:09:56 2014 +0200
     3.3 @@ -47,6 +47,13 @@
     3.4              Double.valueOf(31)
     3.5          );
     3.6      }
     3.7 +    @Test public void noInstOfExposed() throws Exception {
     3.8 +        assertExec(
     3.9 +            "No instOf properties found",
    3.10 +            Instance.class, "noInstOfExposed__I",
    3.11 +            Double.valueOf(0)
    3.12 +        );
    3.13 +    }
    3.14      @Test public void verifyMagicOne() throws Exception {
    3.15          assertExec(
    3.16              "Should be three and something",