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: state_bench.rs
    path of file: ./repos/RustQIP/qip/benches
    
    the code of the file until where you have to start completion: #![feature(test)]

use num_complex::Complex;
use qip::state_ops::matrix_ops::from_reals;
use qip_iterators::iterators::MatrixOp;
use qip_iterators::matrix_ops::apply_op;

/// Make the full op matrix from `ops`.
/// Not very efficient, use only for debugging.
fn make_o
    
    fn bench_apply_many_swaps_small_multiops(b: &mut Bencher) {
        let n = 5;

        let mat = from_reals(&[0.0, 1.0, 1.0, 0.0]);
        let ops: Vec<_> = (0..n)
            .map(|indx| make_matrix_op(vec![indx], mat.clone()).unwrap())
            .collect();

        let base_vector: Vec<f32> = (0..1 << n).map(|_| 0.0).collect();
        let input = from_reals(&base_vector);
        let mut output = from_reals(&base_vector);

        b.iter(|| {
            apply_ops(n, &ops, &input, &mut output, 0, 0);
        });
    }