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: main.rs
    path of file: ./repos/turbo/crates/turbopack-swc-ast-explorer/src
    
    the code of the file until where you have to start completion: use std::{io::stdin, sync::Arc};

use anyhow::Result;
use clap::Parser;
use owo_colors::OwoColorize;
use regex::{NoExpand, Regex};
use swc_core::{
    base::{config::IsModule, try_with_handler, Compiler, HandlerOpts},
    common::{errors::ColorConfig, source_map::FileName, Globals, SourceMap, GLOBALS},
    ecma::{
        ast::EsVersion,
        parser::{Syntax, TsConfig},
    },
};

#[derive(Parser, Debug)]
#[clap(author, version, about, long_about = None)]
struct Args {
    /// Whether to keep Span (location) markers
    #[clap(long, value_parser, default_value_t = false)]
    spans: bool,
}

fn main() -> Result<()> {
    let args = Args::parse();

    let mut contents = 
    
fn main() -> Result<()> {
    let args = Args::parse();

    let mut contents = String::new();
    stdin().read_line(&mut contents)?;

    let sm = Arc::new(SourceMap::default());
    let file = sm.new_source_file(FileName::Anon, contents);
    let target = EsVersion::latest();
    let syntax = Syntax::Typescript(TsConfig {
        tsx: true,
        decorators: false,
        dts: false,
        no_early_errors: true,
        disallow_ambiguous_jsx_like: false,
    });

    let compiler = Compiler::new(sm.clone());
    let res = GLOBALS.set(&Globals::new(), || {
        try_with_handler(
            sm,
            HandlerOpts {
                color: ColorConfig::Always,
                skip_filename: false,
            },
            |handler| compiler.parse_js(file, handler, target, syntax, IsModule::Unknown, None),
        )
    });

    let print = format!("{:#?}", res?);

    let stripped = if args.spans {
        print
    } else {
        let span = Regex::new(r"(?m)^\s+\w+: Span \{[^}]*\},\n").unwrap();
        span.replace_all(&print, NoExpand("")).to_string()
    };