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: tuples.rs
    path of file: ./repos/differential-datalog/rust/template/differential_datalog/src/record
    
    the code of the file until where you have to start completion: //! Implementing `Record`-related traits for Rust tuples

use crate::record::{FromRecord, IntoRecord, Mutator, Record};

/// Implements `FromRecord`, `IntoRecord` and
    
                fn from_record(record: &Record) -> Result<Self, String> {
                    const TUPLE_LENGTH: usize = ddlog_tuple_traits!(@count $($generic),*);

                    match record {
                        Record::Tuple(args) if args.len() == TUPLE_LENGTH => {
                            Ok(ddlog_tuple_traits!(@from_record args [] [0] $($generic),*))
                        },
                        error => Err(format!("not a {}-tuple {:?}", TUPLE_LENGTH, *error)),
                    }
                }