michael@0: function foo(x) {
michael@0:   return bar(x);
michael@0: }
michael@0: function bar(x) {
michael@0:   return x.f + 10;
michael@0: }
michael@0: var g = Object();
michael@0: g.f = 10;
michael@0: assertEq(foo(g), 20);
michael@0: assertEq(foo(g), 20);
michael@0: assertEq(foo(g), 20);
michael@0: eval("g.f = 'three'");
michael@0: assertEq(foo(g), 'three10');