michael@0: // don't panic
michael@0: 
michael@0: f = function() {
michael@0:   x = yield
michael@0: }
michael@0: rv = f()
michael@0: for (a in rv) (function() {})
michael@0: x = Proxy.create((function() {
michael@0:   return {
michael@0:     defineProperty: gc
michael@0:   }
michael@0: })(), x)
michael@0: with({
michael@0:   d: (({
michael@0:     x: Object.defineProperty(x, "", ({
michael@0:       set: Array.e
michael@0:     }))
michael@0:   }))
michael@0: }) {}
michael@0: 
michael@0: // don't crash