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: basic.rs
    path of file: ./repos/parity-ethereum/ethash/benches
    
    the code of the file until where you have to start completion: // Copyright 2015-2020 Parity Technologies (UK) Ltd.
// This file is part of Parity Ethereum.

// Parity Eth
    
fn bench_light_from_file_round_trip_memory(b: &mut Criterion) {
	use std::env;

	let dir = env::temp_dir();
	let height = 486382;
	{
		let builder = NodeCacheBuilder::new(OptimizeFor::Cpu, u64::max_value());
		let mut dummy = builder.light(&dir, height);
		dummy.to_file().unwrap();
	}

	b.bench_function("bench_light_from_file_round_trip_memory", move |b| b.iter(|| {
		let builder = NodeCacheBuilder::new(OptimizeFor::Cpu, u64::max_value());
		let light = builder.light_from_file(&dir, 486382).unwrap();
		light.compute(&HASH, NONCE, u64::max_value());
	}));
}