You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: diesel_for_each_tuple.rs
    path of file: ./repos/diesel/diesel_derives/src
    
    the code of the file until where you have to start completion: use proc_macro2::{Ident, Span, TokenStream};
use quote::quote;

#[cfg(not(feature = "32-column-tables"))]
pub const MAX_TUPLE_SIZE: i32 = 16;
#[cfg(all(not(feature = "64-column-tables"), feature = "32-column-tables"))]
pub const MAX_TUPLE_SIZE: i32 = 32;
#[cfg(all(not(feature = "128-column-tables"), feature = "64-column-tables"))]
pub const MAX_TUPLE_SIZ
    
pub(crate) fn expand(input: ForEachTupleInput) -> TokenStream {
    let call_side = Span::mixed_site();

    let pairs = (0..input.max_size as usize)
        .map(|i| {
            let t = Ident::new(&format!("T{i}"), call_side);
            let st = Ident::new(&format!("ST{i}"), call_side);
            let tt = Ident::new(&format!("TT{i}"), call_side);
            let i = syn::Index::from(i);
            quote!((#i) -> #t, #st, #tt,)
        })
        .collect::<Vec<_>>();

    let mut out = Vec::with_capacity(input.max_size as usize);

    for i in 0..input.max_size {
        let items = &pairs[0..=i as usize];
        let tuple = i + 1;
        out.push(quote! {
            #tuple {
                #(#items)*
            }
        });
    }
    let input = input.inner;

    quote! {
        #input! {
            #(#out)*
        }
    }
}