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That would be helpful yes. But why not ‘for { .. } as[T]’ ? That would look neater (imho)
I'm not so sure. Where does the `yield` go relative to `as`, and why introduce another keyword? Appending the type constructor immediately after the `for` is akin to explicitly specifying the type parameter to a method.
That type parameter constrains the parameters (which come after it), in the same way that the `for`'s "type parameter" would constrain the generators which come after it.
Indeed, forget my comment. 
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