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: vm.rs
    path of file: ./repos/diem/testsuite/diem-fuzzer/src/fuzz_targets
    
    the code of the file until where you have to start completion: // Copyright (c) The Diem Core Contributors
// SPDX-License-Identifier: Apache-2.0

use crate::FuzzTargetImpl;
use diem_proptest_helpers::ValueGenerator;
use move_binary_format::file_format::Co
    
    fn generate(&self, _idx: usize, gen: &mut ValueGenerator) -> Option<Vec<u8>> {
        let value = gen.generate(any_with::<CompiledModule>(16));
        let mut out = vec![];
        value
            .serialize(&mut out)
            .expect("serialization should work");
        Some(out)
    }