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// Tests that IteratorReturn is called when a for-of loop has an abrupt
// completion value during non-iterator code.
function test() {
var returnCalled = 0;
var returnCalledExpected = 0;
var iterable = {};
iterable[Symbol.iterator] = makeIterator({
ret: function() {
returnCalled++;
return {};
}
});
// break calls iter.return
for (var x of iterable)
break;
assertEq(returnCalled, ++returnCalledExpected);
// throw in body calls iter.return
assertThrowsValue(function() {
for (var x of iterable)
throw "in body";
}, "in body");
assertEq(returnCalled, ++returnCalledExpected);
// throw in lhs ref calls iter.return
function throwlhs() {
throw "in lhs";
}
assertThrowsValue(function() {
for ((throwlhs()) of iterable)
continue;
}, "in lhs");
assertEq(returnCalled, ++returnCalledExpected);
// throw in iter.return doesn't re-call iter.return
iterable[Symbol.iterator] = makeIterator({
ret: function() {
returnCalled++;
throw "in iter.return";
}
});
assertThrowsValue(function() {
for (var x of iterable)
break;
}, "in iter.return");
assertEq(returnCalled, ++returnCalledExpected);
// throw in iter.next doesn't call IteratorClose
iterable[Symbol.iterator] = makeIterator({
next: function() {
throw "in next";
}
});
assertThrowsValue(function() {
for (var x of iterable)
break;
}, "in next");
assertEq(returnCalled, returnCalledExpected);
// "return" must return an Object.
iterable[Symbol.iterator] = makeIterator({
ret: function() {
returnCalled++;
return 42;
}
});
assertThrowsInstanceOf(function() {
for (var x of iterable)
break;
}, TypeError);
assertEq(returnCalled, ++returnCalledExpected);
// continue doesn't call iter.return for the loop it's continuing
var i = 0;
iterable[Symbol.iterator] = makeIterator({
next: function() {
return { done: i++ > 5 };
},
ret: function() {
returnCalled++;
return {};
}
});
for (var x of iterable)
continue;
assertEq(returnCalled, returnCalledExpected);
// continue does call iter.return for loops it skips
i = 0;
L: do {
for (var x of iterable)
continue L;
} while (false);
assertEq(returnCalled, ++returnCalledExpected);
}
test();
if (typeof reportCompare === "function")
reportCompare(0, 0);