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: add_helpers.rs
    path of file: ./repos/derive_more/impl/src
    
    the code of the file until where you have to start completion: use proc_macro2::TokenStream;
use quote::quote;
use syn::{Field, Ident, Index};

pub fn tuple_exprs(fields: &[&F
    
pub fn struct_exprs(fields: &[&Field], method_ident: &Ident) -> Vec<TokenStream> {
    let mut exprs = vec![];

    for field in fields {
        // It's safe to unwrap because struct fields always have an identifier
        let field_id = field.ident.as_ref().unwrap();
        // generates `x: self.x.add(rhs.x)`
        let expr = quote! { self.#field_id.#method_ident(rhs.#field_id) };
        exprs.push(expr)
    }
    exprs
}