{"ast_node_type":"variable","tokens":[{"end":98,"kind":"keyword","start":0,"text":"if"}]}
    if let Some((flags, excluded_cargo_defaults)) = rustc_session::utils::extra_compiler_flags() {
    diag.note(format!("rustc {} running on {}", tcx.sess.cfg_version, config::host_tuple(),));
        diag.note(format!("compiler flags: {}", flags.join(" ")));