pub(crate) fn run_compiler( at_args: &[String], callbacks: &mut (dyn Callbacks + Send), file_loader: Option<Box<dyn FileLoader + Send + Sync>>, emitter: Option<Box<dyn Write + Send>>, make_codegen_backend: Option<Box<dyn FnOnce(&Options) -> Box<dyn CodegenBackend> + Send>>) -> Result<()>
