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function foo() {
(function() {
Object.preventExtensions(this);
setJitCompilerOption("ion.warmup.trigger", 4);
var g = newGlobal({newCompartment: true});
g.debuggeeGlobal = this;
g.eval("(" + function () {
dbg = new Debugger(debuggeeGlobal);
dbg.onExceptionUnwind = function (frame, exc) {
var s = '!';
for (var f = frame; f; f = f.older)
debuggeeGlobal.log += s;
};
} + ")();");
try {
j('Number.prototype.toString.call([])');
} catch (exc) {}
})();
} foo();