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Add `iter` macro See related discussion in https://rust-lang.zulipchat.com/#narrow/channel/481571-t-lang.2Fgen/topic/iter!.20macro/near/500784563 very little error case testing so far, but the success path works. There is also no `IterFn` trait yet, as T-lang didn't consider it something urgently needed I think we can implement it in follow-up PRs. r? lang for the tests, `@compiler-errors` for the impl