Function inject

pub fn inject(
    krate: &mut Crate,
    sess: &Session,
    features: &Features,
    resolver: &mut dyn ResolverExpand,
    is_proc_macro_crate: bool,
    has_proc_macro_decls: bool,
    is_test_crate: bool,
    dcx: DiagCtxtHandle<'_>,
)