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: cargo.rs
    path of file: ./repos/cargo-release/src/ops
    
    the code of the file until where you have to start completion: use std::env;
use std::path::Path;

use bstr::ByteSlice;

use crate::config;
use crate::error::CargoResult;
use crate::ops::cmd::call;

/// Expresses what features flags should be used
#[derive(Clone, Debug)]
pub enum Features {
    /// None - don't use special features
    None,
    /// Only use selected features
    Selective(Vec<String>),
    /// Use all features via `all-features`
    All,
}

fn cargo() -> String {
    env::var("CARGO").unwrap_or_else(|_| "cargo".to_owned())
}

pub fn package_content(manifest_path: &Path) -> CargoResult<Vec<std::path::PathBuf>> {
    let mut cmd = std::process::Command::new(cargo());
    cmd.arg("package");
    
pub fn set_package_version(manifest_path: &Path, version: &str, dry_run: bool) -> CargoResult<()> {
    let original_manifest = std::fs::read_to_string(manifest_path)?;
    let mut manifest: toml_edit::Document = original_manifest.parse()?;
    manifest["package"]["version"] = toml_edit::value(version);
    let manifest = manifest.to_string();

    if dry_run {
        if manifest != original_manifest {
            let diff = crate::ops::diff::unified_diff(
                &original_manifest,
                &manifest,
                manifest_path,
                "updated",
            );
            log::debug!("change:\n{diff}");
        }
    } else {
        atomic_write(manifest_path, &manifest)?;
    }

    Ok(())
}