Function rustc_driver::run_compiler

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<()>