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const iterable = {
[Symbol.iterator]() {
return {
i: 0,
next() {
return { value: this.i++, done: false }
},
return(a, b, c, d) {
assertEq(a, undefined);
assertEq(b, undefined);
assertEq(c, undefined);
assertEq(d, undefined);
return { value: "return", done: true };
}
};
}
}
function closeIter(o) {
for (var x of o) {
if (x == 2) {
throw "good";
}
}
}
function test() {
with ({}) {}
for (var i = 0; i < 100; i++) {
var caught = "bad";
try {
closeIter(iterable)
} catch (e) {
caught = e;
}
assertEq(caught, "good");
}
}
with ({}) {}
test();
// Force an IC in Ion.
try {
closeIter([1,2,3,4,5]);
} catch {}
test();