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    use core::fmt::{Formatter, LowerHex, Result, UpperHex};

    use super::BytesRef;
    use crate::{Bytes, BytesMut};

    impl LowerHex for BytesRef<'_> {
        fn fmt(&self, f: &mut Formatter<'_>) -> Result {
            for &b in self.0 {
                write!(f, "{:02x}", b)?;
            }
            Ok(())
        }
    }

    impl UpperHex for BytesRef<'_> {
        fn fmt(&self, f: &mut Formatter<'_>) -> Result {
            for &b in self.0 {
                write!(f, "{:02X}", b)?;
            }
            Ok(())
        }
    }

    macro_rules! hex_impl {
        ($tr:ident, $ty:ty) => {
            impl $tr for $ty {
                fn fmt(&self, f: &mut Formatter<'_>) -> Result {
                    $tr::fmt(&BytesRef(self.as_ref()), f)
                }
            }
        };
    }

    hex_impl!(LowerHex, Bytes);
    hex_impl!(LowerHex, BytesMut);
    hex_impl!(UpperHex, Bytes);
    hex_impl!(UpperHex, BytesMut);