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: build.rs
    path of file: ./repos/nearcore/runtime/near-wallet-contract
    
    the code of the file until where you have to start completion: /// This file is run as a part of `cargo build` process and it builds the `Wallet Contract`.
/// The generated WASM file is put to the `./res` directory.
use anyhow::{anyhow, Context, Ok, Result};

use std::path::{Path, PathBuf};
use std::process::Command;

#[allow(unreachable_code)]
fn main() -> Result<()> {
    // TODO(eth-implicit) Remove this once we have a proper way to generate the Wallet Contract WASM file.
    return Ok(());
    build_contract("./wallet-contract", &[], "wallet_contract")
}

fn build_contract(dir: &str, args: &[&str], output: &str) -> Result<()> {
    let target_dir: PathBuf =
        std::env::var("OUT_DI
    
fn build_contract(dir: &str, args: &[&str], output: &str) -> Result<()> {
    let target_dir: PathBuf =
        std::env::var("OUT_DIR").context("Failed to read OUT_DIR environment variable")?.into();

    // We place the build artifacts in `target_dir` (workspace's build directory).
    let mut cmd = cargo_build_cmd(&target_dir);
    cmd.args(args);
    cmd.current_dir(dir);
    run_checking_status(cmd)?;

    let build_artifact_path =
        format!("wasm32-unknown-unknown/release/{}.wasm", dir.replace('-', "_"));
    let src = target_dir.join(build_artifact_path);
    let wasm_target_path = format!("./res/{}.wasm", output);

    std::fs::copy(&src, &wasm_target_path)
        .with_context(|| format!("Failed to copy `{}` to `{}`", src.display(), wasm_target_path))?;

    println!("cargo:rerun-if-changed={}", dir);
    Ok(())
}