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: transducers.rs
    path of file: ./repos/steel/crates/steel-core/src/values
    
    the code of the file until where you have to start completion: use crate::gc::Gc;
use crate::rvals::Result;
use crate::SteelVal;

use crate::core::utils::{arity_check, declare_const_ref_functions};

// Make a transducer actually contain an option to a rooted value, otherwise
// it is a source agnostic transformer on the (eventual) input
#[derive(Clone, PartialEq, Hash)]
pub struct Transducer {
    // root: G
    
fn nth(args: &[SteelVal]) -> Result<SteelVal> {
    arity_check!(nth, args, 1);

    let number = args[0].clone();

    if let SteelVal::IntV(n) = number {
        if n < 0 {
            stop!(TypeMismatch => format!("nth expected a (postive) integer, found: {number}"));
        }
        Ok(SteelVal::ReducerV(Gc::new(Reducer::Nth(n as usize))))
    } else {
        stop!(TypeMismatch => format!("nth expected a (postive) integer, found: {number}"))
    }
}