let s = "input_string"; let s = std::io::Cursor::new(); let _: Result<u8, io::Error> = http://s.next ().unwrap();
(おそらくすでに他の人が言及していると思いますが)std::io::Cursor を使うと良い事例かとhttps://twitter.com/ironoir/status/953889967482142720 …
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