The proposed syntax already a breaking change, isn't it?
The "for x in iterable { }" syntax could live along the old "for
iterable.each |x| {}" syntax,
making the transition easier.
What motivates your suggestion to keep the syntax the same? I think it's
confusing that it looks like a closure but is functionally different from
one. I remember seeing suggestions to change it to "for pattern in
iterator." Besides being less confusing, I think it simply looks nicer.
Changing the syntax should be a separate breaking change, if it's
going to happen. It would make it a *lot* harder to land this and I
think we need this ASAP.
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