[swift-evolution] [Pitch] Remove destructive consumption from Sequence

[Russ Bishop]

> On Jun 27, 2016, at 9:39 AM, Dave Abrahams via swift-evolution <swift-evolution at swift.org> wrote:
> 
> Perhaps the language should accept types conforming to either of two
> unrelated protocols (your Sequence and Iterator, as you've described
> them, with no refinement relationship) for for-in.
> 

The more I think about it the more I think this is a good model. Iterator is already single-use. Sequence then describes a type that can vend multiple iterators and is inherently multi-pass. I would argue the protocol is making this guarantee already, since makeIterator() naturally lends itself to multiple invocations.

In my example, LazyRowSequence becomes LazyRowIterator.


Russ
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