{"ast_node_type":"variable","tokens":[{"end":63,"kind":"keyword","start":0,"text":"let"}]}
    let (fallback, block) = parse_never_type_options_attr(tcx);
fn never_type_behavior(tcx: TyCtxt<'_>) -> (DivergingFallbackBehavior, DivergingBlockBehavior) {
    let fallback = fallback.unwrap_or_else(|| default_fallback(tcx));