third_party/rust/headers/src/util/iter.rs


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pub trait IterExt: Iterator {
    fn just_one(&mut self) -> Option<Self::Item> {
        let one = self.next()?;
        match self.next() {
            Some(_) => None,
            None => Some(one),
        }
    }
}

impl<T: Iterator> IterExt for T {}