{"ast_node_type":"other","tokens":[{"end":69,"kind":"keyword","start":0,"text":"if"}]}
    if tcx.is_lang_item(fn_def_id.to_def_id(), LangItem::PanicImpl) {
    // Check that a function marked as `#[panic_handler]` has signature `fn(&PanicInfo) -> !`
        check_panic_info_fn(tcx, fn_def_id, fn_sig);