{"ast_node_type":"other","tokens":[{"end":56,"kind":"keyword","start":0,"text":"ty::RePlaceholder(..)"}]}
            ty::RePlaceholder(..) | ty::ReBound(..) => {
            ty::ReVar(_) => canonicalizer.canonical_var_for_region_in_root_universe(r),
                // We only expect region names that the user can type.