michael@0: // Errors accessing next, done, or value don't cause an exception to be
michael@0: // thrown into the iterator of a yield*.
michael@0: 
michael@0: function* g(n) { for (var i=0; i<n; i++) yield i; }
michael@0: function* delegate(iter) { return yield* iter; }
michael@0: 
michael@0: var log = "", inner, outer;
michael@0: 
michael@0: // That var is poisoooooon, p-poison poison...
michael@0: var Poison = new Error;
michael@0: 
michael@0: function log_calls(method) {
michael@0:     return function () {
michael@0:         log += "x"
michael@0:         return method.call(this);
michael@0:     }
michael@0: }
michael@0: 
michael@0: function poison(receiver, prop) {
michael@0:     Object.defineProperty(receiver, prop, { get: function () { throw Poison } });
michael@0: }
michael@0: 
michael@0: // Poison inner.next.
michael@0: inner = g(10);
michael@0: outer = delegate(inner);
michael@0: inner.throw = log_calls(inner.throw);
michael@0: poison(inner, 'next')
michael@0: assertThrowsValue(outer.next.bind(outer), Poison);
michael@0: assertEq(log, "");
michael@0: 
michael@0: // Poison result value from inner.
michael@0: inner = g(10);
michael@0: outer = delegate(inner);
michael@0: inner.next = function () { return { done: true, get value() { throw Poison} } };
michael@0: inner.throw = log_calls(inner.throw);
michael@0: assertThrowsValue(outer.next.bind(outer), Poison);
michael@0: assertEq(log, "");
michael@0: 
michael@0: // Poison result done from inner.
michael@0: inner = g(10);
michael@0: outer = delegate(inner);
michael@0: inner.next = function () { return { get done() { throw Poison }, value: 42 } };
michael@0: inner.throw = log_calls(inner.throw);
michael@0: assertThrowsValue(outer.next.bind(outer), Poison);
michael@0: assertEq(log, "");
michael@0: 
michael@0: // mischief managed.
michael@0: if (typeof reportCompare == "function")
michael@0:     reportCompare(true, true);