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: error_msg.rs
    path of file: ./repos/swc/crates/swc/tests
    
    the code of the file until where you have to start completion: use std::path::{Path, PathBuf};

use swc::{
    config::{Config, IsModule, Options},
    try_with_handler, Compiler, HandlerOpts,
};
use swc_common::{errors::ColorConfig, sync::Lrc, FilePathMapping, SourceMap, GLOBALS};
use testing::{NormalizedOutput, Tester};

fn file(f: impl AsRef<Path>) -> NormalizedOutput {
    Tester::new()
        .print_errors(|cm, handler| -> Result<NormalizedOutput, _> {
            let c = Compiler::new(cm.clone());

            let fm = cm.load_file(f.as_ref()).expect("failed to load file");
            let s = c.process_js_file(
                fm,
                &handler,
                &Options {
                    swcrc: true,
                    ..Default::default()
                },
            );
            if let Err(e) = s {
                return Ok(format!("{:?}", e).into());
            }

            panic!("invalid swcrc should abort build, but got {:?}", s);
        })
        .unwrap()
}

#[test]
fn swcrc_simple() {
    let f = file("tests/swcrc_errors/simple/foo.js");
    println!("{}", f);
}

#[testing::fixture("tests/errors/**/input.js")]
#[testing::fixture("tests/errors/**/input.ts")]
fn 
    
fn fixture(input: PathBuf) {
    let _log = testing::init();
    let output_path = input.parent().unwrap().join("output.swc-stderr");

    let cm = Lrc::new(SourceMap::new(FilePathMapping::empty()));
    let err = GLOBALS.set(&Default::default(), || {
        try_with_handler(
            cm.clone(),
            HandlerOpts {
                skip_filename: true,
                color: ColorConfig::Never,
            },
            |handler| {
                let c = Compiler::new(cm.clone());

                let fm = cm.load_file(&input).expect("failed to load file");

                match c.process_js_file(
                    fm,
                    handler,
                    &Options {
                        config: Config {
                            is_module: Some(IsModule::Unknown),
                            ..Default::default()
                        },
                        swcrc: true,

                        ..Default::default()
                    },
                ) {
                    Ok(..) => {}
                    Err(err) => return Err(err),
                }

                Ok(())
            },
        )
        .expect_err("should fail")
    });

    let output = NormalizedOutput::from(format!("{}", err));

    output.compare_to_file(output_path).unwrap();
}