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: parse_util.rs
    path of file: ./repos/Relm4/relm4-macros/src/widgets
    
    the code of the file until where you have to start completion: use std::sync::atomic::{AtomicU16, Ordering};

use proc_macro2::Span as Span2;
use syn::parse::ParseBuffer;
use syn::spanne
    
pub(super) fn braces<'a>(input: &'a ParseBuffer<'_>) -> Result<ParseBuffer<'a>, ParseError> {
    let content = (move || {
        let content;
        braced!(content in input);
        Ok(content)
    })();
    Ok(content?)
}