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: aide.rs
    path of file: ./repos/svix-webhooks/server/svix-server_derive/src
    
    the code of the file until where you have to start completion: use proc_macro2::TokenStream;
use quote::{format_ident, quote, ToTokens as _};
use syn::{punctuated::Punctuated, Token};

pub typ
    
fn doc_comment_from_attributes(attributes: &Vec<syn::Attribute>) -> Option<String> {
    let mut doc_comment_lines = Vec::new();

    for attr in attributes {
        if !attr.path().is_ident("doc") {
            continue;
        }

        // Ignore bare `#[doc]` and `#[doc(foo)]` attributes, only look at `#[doc = "foo"]`
        let Ok(name_val) = attr.meta.require_name_value() else {
            continue;
        };

        // Malformed doc attribute, likely a compile error anyways
        let Some(doc) = expr_to_litstr(&name_val.value) else {
            continue;
        };

        doc_comment_lines.push(doc.value().trim().to_owned());
    }

    if doc_comment_lines.is_empty() {
        return None;
    }
    Some(doc_comment_lines.join("\n"))
}