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: mul_like.rs
    path of file: ./repos/derive_more/impl/src
    
    the code of the file until where you have to start completion: use crate::add_like;
use crate::mul_helpers::generics_and_exprs;
use crate::utils::{AttrParams, HashSet, MultiFieldData, RefType, State};
use proc_macro2::TokenStream;
use quote::{format_ident, quote};
use std::iter;
use syn::{DeriveInput, Result};

pub fn expand(input: &DeriveInput, trait_name: &'static str) -> Result<TokenStream> {
    let mut state = State::with_attr_params(
        input,
        trait_name,
        trait_name.to_lowercase(),
        AttrParams::struct_(vec!["forward"]),
    )?;
    if state.default_info.forward {
        return Ok(add_like::expand(input, trait_name));
    }

    let scalar_ident = format_ident!("__RhsT");
    state.add_trait_path_type_param(quote! { #scalar_ident });
    let multi_field_data = state.enabled_fields_data();
    let MultiFieldData {
        input_type,
        field_types,
        ty_generics,
        trait_path,
        trait_path_with_params,
        method_ident,
        ..
    } = multi_field_data.clone();

    let tys = field_types.iter().collect::<HashSet<_>
    
pub fn expand(input: &DeriveInput, trait_name: &'static str) -> Result<TokenStream> {
    let mut state = State::with_attr_params(
        input,
        trait_name,
        trait_name.to_lowercase(),
        AttrParams::struct_(vec!["forward"]),
    )?;
    if state.default_info.forward {
        return Ok(add_like::expand(input, trait_name));
    }

    let scalar_ident = format_ident!("__RhsT");
    state.add_trait_path_type_param(quote! { #scalar_ident });
    let multi_field_data = state.enabled_fields_data();
    let MultiFieldData {
        input_type,
        field_types,
        ty_generics,
        trait_path,
        trait_path_with_params,
        method_ident,
        ..
    } = multi_field_data.clone();

    let tys = field_types.iter().collect::<HashSet<_>>();
    let tys = tys.iter();
    let scalar_iter = iter::repeat(&scalar_ident);
    let trait_path_iter = iter::repeat(trait_path);

    let type_where_clauses = quote! {
        where #(#tys: #trait_path_iter<#scalar_iter, Output=#tys>),*
    };

    let (generics, initializers) = generics_and_exprs(
        multi_field_data.clone(),
        &scalar_ident,
        type_where_clauses,
        RefType::No,
    );
    let body = multi_field_data.initializer(&initializers);
    let (impl_generics, _, where_clause) = generics.split_for_impl();
    Ok(quote! {
        #[automatically_derived]
        impl #impl_generics  #trait_path_with_params for #input_type #ty_generics #where_clause {
            type Output = #input_type #ty_generics;

            #[inline]
            fn #method_ident(self, rhs: #scalar_ident) -> #input_type #ty_generics {
                #body
            }
        }
    })
}