function foo(o) { return o.f; } noInline(foo); var o = Object.create(null); for (var i = 0; i < 10000; ++i) { var result = foo(o); if (result !== void 0) throw "Error: bad result in loop: " + result; } o.f = 42 var result = foo(o); if (result !== 42) throw "Error: bad result at end: " + result;