{"ast_node_type":"other","tokens":[{"end":68,"kind":"keyword","start":0,"text":"tag_base_type_opt(tcx,"}]}
    tag_base_type_opt(tcx, enum_type_and_layout).unwrap_or_else(|| {
pub fn tag_base_type<'tcx>(tcx: TyCtxt<'tcx>, enum_type_and_layout: TyAndLayout<'tcx>) -> Ty<'tcx> {
        bug!("tag_base_type() called for enum without tag: {:?}", enum_type_and_layout)