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So, while it's true that you usually use unbounded iterators with take(), I'm not sure we actually explained them before this point. Can you look into that, please?

Yeah they're explained in the previous section. https://github.com/rust-lang/rust/pull/25941/files#diff-f81dbe18693d6f4de2cd78b29a5ea670R284

@puzza007 excellent, thank you!

@bors: r+ rollup

📌 Commit 5fefae6 has been approved by steveklabnik