iterclose-dynamic-slot.js (833B)
1 var counter = 0; 2 const iterable = { 3 [Symbol.iterator]() { 4 return { 5 i: 0, 6 7 // Force the return method into a dynamic slot. 8 x0: 0, x1: 0, x2: 0, x3: 0, x4: 0, x5: 0, x6: 0, x7: 0, x8: 0, 9 x9: 0, x10: 0, x11: 0, x12: 0, x13: 0, x14: 0, x15: 0, x16: 0, 10 x17: 0, x18: 0, x19: 0, x20: 0, x21: 0, x22: 0, x23: 0, x24: 0, 11 12 next() { 13 return { value: this.i++, done: false } 14 }, 15 return() { 16 counter += 1; 17 return { value: undefined, done: true }; 18 } 19 }; 20 } 21 } 22 23 function closeIter(o) { 24 for (var x of o) { 25 if (x == 2) { 26 break; 27 } 28 } 29 } 30 31 function test() { 32 with ({}) {} 33 counter = 0; 34 for (var i = 0; i < 100; i++) { 35 closeIter(iterable) 36 } 37 assertEq(counter, 100) 38 } 39 40 with ({}) {} 41 42 test(); 43 44 // Force an IC in Ion. 45 closeIter([1,2,3]); 46 47 test();