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