michael@0: expected = '';
michael@0: 
michael@0: function g(code) {
michael@0:   f = Function(code);
michael@0:   gen = f();
michael@0:   gen.next();
michael@0:   try { gen.next(); } catch (ex) { expected = ex.toString() }
michael@0: }
michael@0: 
michael@0: g("\
michael@0:   yield this.__defineGetter__('x', function(){ return z }); \
michael@0:   let z = new String('hi'); \
michael@0:   ");
michael@0: 
michael@0: eval();
michael@0: gc();
michael@0: 
michael@0: str = x;
michael@0: 
michael@0: assertEq(expected, "[object StopIteration]");
michael@0: assertEq(str.toString(), "hi");