{"ast_node_type":"function","tokens":[{"end":80,"kind":"keyword","start":0,"text":"fn"}]}
fn check_mod_unstable_api_usage(tcx: TyCtxt<'_>, module_def_id: LocalModDefId) {
/// features and possibly prints errors.
    tcx.hir_visit_item_likes_in_module(module_def_id, &mut Checker { tcx });