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use std::cell::{Ref, RefMut};
use std::fmt::{Display, Formatter};

pub trait Display2 {
    fn fmt2(&self, fmt: &mut Formatter<'_>) -> std::fmt::Result;
}

impl<'a, T: Display2> Display2 for Ref<'a, T> {
    fn fmt2(&self, fmt: &mut Formatter<'_>) -> std::fmt::Result {
        Display2::fmt2(&**self, fmt)
    }
}

impl<'a, T: Display2> Display2 for RefMut<'a, T> {
    fn fmt2(&self, fmt: &mut Formatter<'_>) -> std::fmt::Result {
        Display2::fmt2(&**self, fmt)
    }
}

pub struct Display2Wrapper<'a, T: Display2> {
    pub value: &'a T
}

impl<'a, T: Display2> Display2Wrapper<'a, T> {
    pub fn new(value: &'a T) -> Self {
        Self { value }
    }
}

impl<'a, T: Display2> Display for Display2Wrapper<'a, T> {
    fn fmt(&self, fmt: &mut Formatter<'_>) -> std::fmt::Result {
        self.value.fmt2(fmt)
    }
}

pub trait ToString2 {
    fn to_string2(&self) -> String;
}

impl<T: Display2> ToString2 for T {
    fn to_string2(&self) -> String {
        format!("{}", Display2Wrapper::new(self))
    }
}