Status: Untriaged
Owner: ----
New issue 4270 by [email protected]: new Map(iterable) should close the
argument iterator after a value is not Object error.
https://code.google.com/p/v8/issues/detail?id=4270
Version: V8 version 4.5.0 (candidate)
OS: Mac OS
Architecture: x64.debug
When creating a new Map object, if a iterable item is caught on the `not
Object` error, it should close the iterator:
Ref: 23.1.1.1 item 9.f.ii
23.1.1.1 Map ( [ iterable ] )
...
9. Repeat
...
d. Let nextItem be IteratorValue(next).
e. ReturnIfAbrupt(nextItem).
f. If Type(nextItem) is not Object,
i. Let error be Completion{[[type]]: throw, [[value]]: a newly created
TypeError object, [[target]]:empty}.
ii. Return IteratorClose(iter, error).
Example Code:
```
var closed = false;
var iterable = {};
iterable[Symbol.iterator] = function() {
return {
next: function() {
return { value: 1, done: false };
},
return: function() {
closed = true;
}
};
};
try {
new Map(iterable);
} catch() {
// it will throw a TypeError
}
```
Expects `closed` to be `true`, as the iterable argument should be closed.
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