Status: Accepted
Owner: [email protected]
CC: [email protected], [email protected], [email protected]
Labels: Type-Bug Priority-Medium
New issue 3484 by [email protected]: yield* should only propagate throw() if
iterator has throw() implementation
http://code.google.com/p/v8/issues/detail?id=3484
Sadly, it seems that our yield* implementation is incomplete, even after
http://code.google.com/p/v8/issues/detail?id=3422 is fixed. Consider:
var o = (function* () { yield* [1,2,3] })()
o.next() // -> { value: 1, done: false }
o.throw("foo")
The expectation is that the generator checks for the presence of a "throw"
property on the iterator. If present, we call that property to get the
next { value, done } result. If not present, we should throw the given
object.
Currently V8 unconditionally calls the throw method on the iterator.
Thoughts on how to fix this? I could separate the getproperty from the
call, but that would mean more assembly :(
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