{"ast_node_type":"other","tokens":[{"end":49,"kind":"keyword","start":0,"text":"#[label(hir_typeck_int_to_fat_label_nightly)]"}]}
    #[label(hir_typeck_int_to_fat_label_nightly)]
    pub cast_ty: Ty<'tcx>,
    pub expr_if_nightly: Option<Span>,