std::str::Chars が as_str() を持っているのでこうすると良さそう let s = "ほげほげ"; let t = s.chars().next().as_str(); // t = "げほげ"
let s = "ほげほげ"; let t = { let mut s = self.chars(); http://s.next (); s.as_str() }; // "げほげ"
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