pub mod core {
    pub mod iter {
        mod traits {
            mod iterator {
                pub trait Iterator {
                    fn cmp_by<I, F>(mut self, other: I, mut cmp: F) -> Ordering
                    where
                        Self: Sized,
                        I: IntoIterator,
                        F: FnMut(Self::Item, I::Item) -> Ordering,
                    {
                    }
                    fn partial_cmp_by<I, F>(
                        mut self,
                        other: I,
                        mut partial_cmp: F,
                    ) -> Option<Ordering>
                    where
                        Self: Sized,
                        I: IntoIterator,
                        F: FnMut(Self::Item, I::Item) -> Option<Ordering>,
                    {
                    }
                    fn eq_by<I, F>(mut self, other: I, mut eq: F) -> bool
                    where
                        Self: Sized,
                        I: IntoIterator,
                        F: FnMut(Self::Item, I::Item) -> bool,
                    {
                    }
                }
            }
        }
    }
}