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: lib.rs
    path of file: ./repos/bevy/crates/bevy_utils/macros/src
    
    the code of the file until where you have to start completion: // FIXME(3492): remove once docs are ready
#![allow(missing_docs)]

use proc_macro::TokenStream;
use quote::{format_ident, quote};
use syn::{
    parse::{Parse, ParseStream},
    parse_macro_input,
    token::Comma,
    Ident, LitInt, Result,
};
struct AllTuples {
    macro_ident: Ident,
    start: usize,
    end: usize,
    idents: Vec<Ident>,
}

impl Parse for AllTuples {
    fn parse(input: ParseStream) -> Result<Self> {
        let macro_ident = input.parse::<Ident>()?;
        input.parse::<Comma>()?;
        let start = input.parse::<LitInt>()?.base10_parse()?;
        input.parse::<Comma>()?;
        let end = input.parse::<LitInt>()?.base10_parse()?;
        input.parse::<Comma>()?;
        let mut idents = vec![input.parse::<Ident>()?];
        while input.parse::<Comma>().is_ok() {
            idents.p
    
pub fn all_tuples(input: TokenStream) -> TokenStream {
    let input = parse_macro_input!(input as AllTuples);
    let len = 1 + input.end - input.start;
    let mut ident_tuples = Vec::with_capacity(len);
    for i in 0..=len {
        let idents = input
            .idents
            .iter()
            .map(|ident| format_ident!("{}{}", ident, i));
        if input.idents.len() < 2 {
            ident_tuples.push(quote! {
                #(#idents)*
            });
        } else {
            ident_tuples.push(quote! {
                (#(#idents),*)
            });
        }
    }

    let macro_ident = &input.macro_ident;
    let invocations = (input.start..=input.end).map(|i| {
        let ident_tuples = &ident_tuples[..i];
        quote! {
            #macro_ident!(#(#ident_tuples),*);
        }
    });
    TokenStream::from(quote! {
        #(
            #invocations
        )*
    })
}