krdln · August 29, 2015 14:01
diff --git a/len.rs b/len.rs
 trait Iterator<T> {
  //...
  fn len(self) { // not &mut self !
    match self.size_hint() {
      (bot, Some(up)) if bot == up => bot,
      _ => self.fold(0, |cnt, _x| cnt + 1)
    }
  }
 }
	trait Iterator<T> {
	//...
	fn len(self) { // not &mut self !
	match self.size_hint() {
	(bot, Some(up)) if bot == up => bot,
	_ => self.fold(0, \|cnt, _x\| cnt + 1)
	}
	}
	}