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: terser_exec.rs
    path of file: ./repos/swc/crates/swc_ecma_minifier/tests
    
    the code of the file until where you have to start completion: extern crate swc_malloc;

use std::{
    fmt::Debug,
    fs::read_to_string,
    path::{Path, PathBuf},
    process::Command,
    sync::mpsc,
    thread,
    time::{Duration, Instant},
};

use ansi_term::Color;
use anyhow::{anyhow, bail, Context, Error};
use serde::Deserialize;
use swc_common::{
    comments::SingleThreadedComments,
    errors::{Handler, HANDLER},
    sync::Lrc,
    Mark, SourceMap,
};
use swc_ecma_ast::*;
use swc_ecma_codegen::{
    text_writer::{omit_trailing_semi, JsWriter, WriteJs},
    Emitter,
};
use swc_ecma_minifier::{
    optimize,
    option::{terser::TerserCompressorOptions, CompressOptions, ExtraOptions, MinifyOptions},
};
use swc_ecma_parser::{
    lexer::{input::SourceFileInput, Lexer},
    EsConfig, Parser, Syntax,
};
use swc_ecma_transforms_base::{
    fixer::{fixer, paren_remover},
    hygiene::hygiene,
    resolver,
};
use swc_ecma_visit::{FoldWith, VisitMutWith};
use testing::assert_eq;

#[testing::fixture(
    "tests/terser/compress/**/input.js",
    exclude(
        // We don't care about ie8
        "ie8",
        // tests with infinite loops
        "reduce_vars/toplevel_off_loops_2",
        "reduce_vars/toplevel_on_loops_2",
        "drop_unused/issue_1656",
        "transform/condition_evaluate",
        "reduce_vars/var_assign_3",
        // should error
        "blocks/issue_1672_if_strict",
        "blocks/issue_1672_for_strict",
        // annex B
        "blocks/issue_1672_if",
        "blocks/issue_1672_for",
        // parser error
        "arrow/async_identifiers",
        "async/async_identifiers"
    )
)]
fn terser_exec(input: PathBuf) {
    let dir = input.parent().unwrap();

    let config = dir.join("config.json");
   
    
fn terser_exec(input: PathBuf) {
    let dir = input.parent().unwrap();

    let config = dir.join("config.json");
    let config = read_to_string(config).expect("failed to read config.json");
    eprintln!("---- {} -----\n{}", Color::Green.paint("Config"), config);

    let _ = testing::run_test2(false, |cm, handler| {
        let input_src = read_to_string(&input).map_err(|_| {
            eprintln!("WTF?");
        })?;
        // This can change the output
        if input_src.contains("/*#/PURE/*/") {
            return Ok(());
        }

        let input_stdout = stdout_of(&input_src, Duration::from_millis(1000)).map_err(|_| {
            eprintln!("This test is not executable test: \n{}", input_src);
        })?;

        // Formmating
        if input_stdout.contains("function") {
            return Ok(());
        }

        let mut expected_src = None;

        let expected_stdout = read_to_string(dir.join("expected.stdout"))
            .or_else(|_| {
                let src = read_to_string(dir.join("output.terser.js"))
                    .context("This test does not have `output.terser.js`")?;

                expected_src = Some(src.clone());

                stdout_of(&src, Duration::from_millis(500))
                    .context("This test is not executable test")
            })
            .context("This test is not an excutable test")
            .map_err(|err| {
                eprintln!("{}", err);
            })?;

        if input_stdout != expected_stdout {
            eprintln!("This test is not for execution");
            return Err(());
        }

        eprintln!("Optimizing");

        let output = run(cm.clone(), &handler, &input, &config);
        let output_program = match output {
            Some(v) => v,
            None => return Err(()),
        };

        let actual = print(cm, &[output_program], false, false);
        let actual_stdout = stdout_of(&actual, Duration::from_secs(5)).unwrap();

        if let Some(expected_src) = expected_src {
            eprintln!(
                "---- {} -----\n{}",
                Color::Green.paint("Expected"),
                expected_src
            );
        }

        eprintln!("---- {} -----\n{}", Color::Green.paint("Actual"), actual);

        eprintln!(
            "---- {} -----\n{}",
            Color::Green.paint("Expected stdout"),
            expected_stdout
        );
        eprintln!(
            "---- {} -----\n{}",
            Color::Green.paint("Actual stdout"),
            actual_stdout
        );

        println!("{}", input.display());

        assert_eq!(expected_stdout, actual_stdout);

        Ok(())
    });
}