#![allow(warnings)]

use serde::de::Error as DeError;
use serde::{de::*, ser::*};
use std::fmt;
use std::marker::PhantomData;

macro_rules! tri {
    ($expr:expr) => {
        match $expr {
            Ok(val) => val,
            Err(err) => return Err(err),
        }
    };
}

macro_rules! tuple_impls {
    ($(($($n:tt $name:ident)+))+) => {$(
        const _: () = { struct TupleVisitor<$($name,)+> {
            marker: PhantomData<($($name,)+)>,
        }

            fn visit_seq<'de, $($name: Deserialize<'de>,)+ A>(this: TupleVisitor<$($name,)+>, mut seq: A) -> Result<($($name,)+), A::Error>
            where
                A: SeqAccess<'de>,
            {
                $(
                    let $name = match tri!(seq.next_element()) {
                        Some(value) => value,
                        None => todo!(),
                    };
                )+

                Ok(($($name,)+))
            }
    };)*}
}

tuple_impls! {
    (0 T0 1 T1 2 T2 3 T3 4 T4 5 T5 6 T6 7 T7 8 T8 9 T9 10 T10 11 T11 12 T12 13 T13 14 T14 15 T15 16 T16 17 T17)
}