> > > I also note > this is the first JS construct that would introduce the notion of > resource acquisition and also of implicit finallies. >
And that is why late changes like this are risky. As far as I know, there's been no published work exploring how this aspect of for-of would interact with future designs which might address resource management in general. Furthermore, as far as I know we have absolutely no real-world experience with how such an auto-cleanup construct would actually fare in javascript. There is no time to do the homework that this effort would properly require.
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