{"ast_node_type":"other","tokens":[{"end":90,"kind":"keyword","start":0,"text":"REGION_TAG"}]}
                REGION_TAG => GenericArgKind::Lifetime(ty::Region(Interned::new_unchecked(
            match self.ptr.addr().get() & TAG_MASK {
                    ptr.cast::<ty::RegionKind<'tcx>>().as_ref(),