next-arity.js (441B)
1 // For-of passes one arg to "next". 2 3 load(libdir + 'iteration.js') 4 5 var log = ''; 6 7 function Iter() { 8 function next() { 9 log += 'n'; 10 assertEq(arguments.length, 0) 11 assertEq(arguments[0], undefined) 12 return { get value() { throw 42; }, done: true } 13 } 14 15 this[Symbol.iterator] = function () { return this; } 16 this.next = next; 17 } 18 19 for (var x of new Iter()) 20 throw 'not reached'; 21 22 assertEq(log, 'n');