[External] : Effectively final loop counter (was: Are templated string embedded expressions "method parameters" or "lambdas"?)

[Brian Goetz]

> This is a somewhat separate topic but I would be glad to see some
> improvement here with respect to good old for loops, as I often saw
> copying to a new variable for the sake of lambda capture inside the
> loop.

As a separate separate topic, I'd like to make good-old-for-loops more 
of a thing of the past.

For example, there's a reasonable stacking of features atop Valhalla 
that gets us to:

     for (int i : 0..<n) { ... }

with no performance overhead (e.g., no Iterator creation.)

My point is not to dive into the stack of features that get us there, 
but to point out that the "enhanced" for loop, which is currently 
extremely limited, has some legs to be generalized to the point where 
old-school for loops might look more quaint.  So I'd rather spend energy 
on that, rather than rehabilitating the borrowed-from-C for loop.