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function x() { n; }
function f() {
try { x(); } catch(ex) {}
}
var g = newGlobal({newCompartment: true});
g.parent = this;
g.eval("new Debugger(parent).onExceptionUnwind = function () {};");
enableGeckoProfiling();
try {
enableSingleStepProfiling();
} catch (e) {
// Not all platforms support single-step profiling.
}
f();
f();
f();