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: next_block.rs
    path of file: ./repos/glicol/rs/synth/benches
    
    the code of the file until where you have to start completion: use criterion::{black_box, criterion_group, criterion_main, Criterion};
use glicol_synth::{oscillator::SinOsc, AudioContextBuilder};

fn next_block_benchmark(c: &mut Criterion) {
    let mut context = AudioContextBuilder::<128>::new()
        .sr(44100)
        .channels(2)
        .build();
    let node_a = context.add_stereo_n
    
fn next_block_benchmark(c: &mut Criterion) {
    let mut context = AudioContextBuilder::<128>::new()
        .sr(44100)
        .channels(2)
        .build();
    let node_a = context.add_stereo_node(SinOsc::new().freq(black_box(440.)));
    context.connect(node_a, context.destination);

    c.bench_function("next_block", |b| {
        b.iter(|| {
            context.next_block();
        })
    });
}