How to dynamically set writer

[caibirdme]

Here's my code, but it cannot compile

fn init_tracing_subscriber(file: String, filter_directives: &str,) {
	let w = get_writer(file);
	tracing_subscriber::registry()
		.with(tracing_subscriber::EnvFilter::new(filter_directives))
		.with(
			tracing_subscriber::fmt::layer()
			.json()
			.with_writer(w),
		)
		.init();
}

fn get_writer(file: String)-> Box<dyn std::io::Write> {
	if file.as_str() == "stdout" {
		Box::new(std::io::stdout())
	} else if file.as_str() == "stderr" {
		Box::new(std::io::stderr())
	} else {
		Box::new(
			OpenOptions::new()
				.append(true)
				.create(true)
				.open(file)
				.unwrap(),
		)
	}
}

[mladedav]

If you include the compilation error maybe someone will help you.