Design meeting: Async iteration (part 1)

[traviscross]

Summary

We'll be discussing async iteration, in particular trying to bring the team up to speed on what's been discussed so far. We're not expecting to cover the full depth here, and we're not expecting to decide anything. We know this one is going to take a number of meetings, so this is just to start to build context.

About this issue

This issue corresponds to a lang-team design meeting proposal. It corresponds to a possible topic of discussion that may be scheduled for deeper discussion during one of our design meetings.