Yuichi Nishiwaki <mailto:yuichi.nishiw...@gmail.com>
August 31, 2013 12:45 PM
ES5 specifies "yield" as a reserved keyword, right?
Wrong, only ES5 strict reserved "yield".
So there should be
no need to make it contextual.
There is; when we first tried reserving "yield" in 2006, we had to put
it behind opt-in versioning because content used "yield" as an
unqualified identifier. IIRC it's still used.
Backward compatibility is what it is. "use strict"; in ES5 was an
opt-in, so not widely adopted enough (i.e., universally adopted) to help.
/be
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