michael@0: 
michael@0: arguments = [];
michael@0: try {
michael@0:     arguments.toSource = (function() {
michael@0:         __proto__.y = x
michael@0:     })
michael@0:     y = this
michael@0:     print(x = 8)
michael@0:     a = arguments
michael@0:     for (v of this) {}
michael@0: } catch (e) {}
michael@0: function f() {
michael@0:   "HELLO " + y
michael@0: }
michael@0: f()
michael@0: f()
michael@0: y = 1[7]
michael@0: f()